Loft Insulation: Costs, Ventilation & Dampness Challenges (2023)

A look at the loft insulation costs, ventilation, dampness, and structural problems

Are you considering insulating your loft but feeling overwhelmed by the potential challenges, including the daunting loft insulation cost?

Don’t worry; you’re not alone. Many homeowners face obstacles such as ventilation issues, dampness, and structural problems when it comes to insulating their lofts.

Here are some practical solutions to tackle each challenge and how you can have your loft upgraded for free if you qualify for the loft insulation grant through Energy Company Obligation (ECO) scheme.

Armed with the right knowledge and resources, you’ll be on your way to a warm, comfortable, and energy-efficient living space in no time!

Why Loft Insulation is Important

Loft insulation plays a vital role in maintaining a comfortable and energy-efficient home. A well-insulated loft helps to reduce heat loss, lower energy bills, and minimise your carbon footprint. However, there are several challenges that homeowners may encounter when installing loft insulation with loft insulation costs on top of them.

Common Loft Insulation Challenges

Some of the most frequent issues homeowners face when insulating their lofts include loft insulation cost, ventilation problems, dampness, and structural issues. Blanket insulation cost, for instance, can be a significant concern for many, especially when factoring in the size of the loft floor and the type of property, such as a semi-detached house or a detached house.

Ventilation issues may arise when insulating your roof space, which could lead to dampness and affect heat retention in your home. It is essential to consider the usable loft space, attic insulation, and access to the loft ladder when insulation is installed, as well as any obstacles such as electrical wires and heating systems.

Dampness can be a challenge when removing old loft insulation, as moisture can cause damage to the materials and the loft floor. When installing foam insulation, it’s crucial to ensure that any electrical wires and the heating system are not compromised, and that the loft legs used are suitable for the weight of the insulation.

The findings from the SINTEF archive show that moisture is a dominant exposure factor, especially in roof constructions. In pitched wooden roofs, more than half of the defects are caused by deficiencies in design, materials, or workmanship, where these deficiencies allow moisture from precipitation or indoor moisture into the structure.

Source: L. Gullbrekken et al. “Norwegian Pitched Roof Defects.” Buildings (2016).

Loft Insulation: Costs, Ventilation & Dampness Challenges (1)

A draughty loft can lead to poor heat retention and increased energy bills, so addressing any gaps in old insulation or installing new insulation is essential.

Loft boarding is another factor to consider when insulating your loft, as it can impact the type of insulation material used, such as mineral fibre or sheep’s wool and thus loft insulation costs.

Specialist equipment may be necessary for installing some types of loft insulation, such as asbestos insulation or lightweight materials. For instance, an insulation installer may need specific tools and safety equipment for removing asbestos insulation or installing blown-in insulation like cellulose fibre or cork granules.

Loft insulations can significantly improve your home’s energy efficiency, but it’s important to choose the right insulation project for your living space. An insulation specialist can guide you through the various types of loft insulation available and help you select the most suitable option for your home, whether it’s lightweight material, sheep’s wool, or mineral fibre. They can also advise on the ECO scheme, which may provide financial assistance for eligible households.

Challenge of Loft Insulation Costs

A common challenge homeowners may encounter when contemplating roof insulation is the loft insulation cost. Although insulating your loft can be a substantial investment, it’s crucial to keep in mind that it can lead to considerable energy savings, helping to retain heat, decrease of heating bills costs, and enhanced comfort in the long term.

DYI loft insulation costs

If you opt to insulate your loft yourself, you can expect to pay for the insulation materials and any tools or equipment you may require. Loft insulation costs for DIY projects can differ based on the type of insulation material selected, usually ranging from £100 to £500.

Professional hire cost of roof insulation

When hiring a professional, loft insulation costs for materials and installation can reach £1,500.

Grant funding – ECO4

Nevertheless, it’s important to note that some homeowners may be eligible for free loft insulation as part of the Energy Company Obligation. This programme aims to assist qualifying low-income households in the UK in enhancing their home’s energy efficiency by providing financial support for energy-saving measures, including loft insulation.

If you are eligible for this scheme, an approved installer will carry out the loft insulation work at no cost to you, making it an affordable solution to tackle loft insulation cost challenges.

You can check if you qualify for the ECO4 scheme, here.

Addressing Ventilation Issues

Proper ventilation is crucial for maintaining good indoor air quality and preventing moisture-related problems in your loft.

A well-ventilated loft will also help extend the lifespan of your insulation materials and prevent additional loft insulation costs in the future. Incorrectly installed loose fill insulation or blanket insulation can affect ventilation.

An insulation specialist can help you assess which types of loft insulation can prevent ventilation issues.

Signs of Poor Ventilation

  • Some common signs that your loft may have ventilation issues include:
  • Condensation on windows or other surfaces
  • Musty odours
  • Mold or mildew growth
  • Increased humidity levels

How to Improve Loft Ventilation

To enhance the ventilation in your roof insulation, consider the following solutions:

  • Install ridge vents along the peak of your roof.
  • Add soffit vents at the eaves of your roof to allow fresh air to enter.
  • Use a ventilation fan to actively circulate air in your loft space.
  • Ensure there is adequate airflow between insulation materials and roof sheathing.

Tackling Dampness and Moisture

Dampness and moisture in your loft can lead to mould growth, damage to insulation materials, and structural problems. Common causes of dampness include:

  • Leaking roofs or plumbing
  • Poorly sealed windows or doors
  • High indoor humidity levels

Prevention and Remedies

To prevent and address dampness and moisture in your loft, follow these steps:

  • Regularly inspect your roof, gutters, and plumbing for leaks or damage, and repair them as needed.
  • Ensure windows and doors are properly sealed to prevent moisture ingress.
  • Use a dehumidifier to reduce indoor humidity levels if necessary.
  • Install a vapour barrier to prevent moisture from penetrating your insulation materials.
  • Keep your loft well-ventilated to encourage air circulation and moisture evaporation.

Dealing with Structural Issues

Identifying Loft Structural Problems

Structural issues in your loft can lead to compromised insulation performance and potential safety hazards. Some common signs of structural problems include:

  • Sagging or uneven floors
  • Cracked or bowing walls
  • Gaps around windows or doors
  • Damaged roof timbers

Solutions for Structural Issues

If you suspect that your loft has structural issues, it is crucial to address them promptly. Here are some steps you can take:

  • Consult a qualified structural engineer to assess the severity of the problem and recommend suitable solutions.
  • Repair or replace damaged roof timbers, floor joists, or other structural elements.
  • Ensure that your loft insulation materials are compatible with your home’s construction and are installed correctly to avoid putting undue stress on the structure.
  • Regularly inspect your loft for signs of structural issues and address them as needed.

Overcoming common challenges in loft insulation, including loft insulation cost, ventilation, dampness, and structural issues, is crucial for maintaining a comfortable and energy-efficient home. By following the advice and solutions provided in this article, you can tackle the loft insulation cost and ensure that your loft insulation performs optimally and lasts for many years to come.

Addressing the loft insulation cost is vital to make this home improvement project accessible and budget-friendly. Investigate available grants and financial assistance programmes, such as the ECO4 scheme, to potentially reduce or even eliminate the loft insulation cost for qualifying households. By doing so, you’ll be able to enjoy the benefits of an insulated loft without breaking the bank.

Moreover, paying attention to ventilation, dampness, and structural issues while considering loft insulation cost ensures that your investment in insulation is worthwhile, as it will contribute to lower energy bills, increased heat retention, and a reduced carbon footprint. Don’t let the loft insulation cost be a barrier to achieving a more energy-efficient and comfortable living space.

By understanding the differences between these insulation types, you can select the most suitable material for your loft insulation project, considering factors such as ease of installation, energy efficiency and loft insulation cost.

Loft Insulation: Costs, Ventilation & Dampness Challenges (2)

Frequently Asked Questions

What is the ideal type of loft insulation for my home, considering loft insulation costs and energy efficiency?

The perfect loft insulation for your home depends on factors such as your home’s construction, climate, and budget.

Common materials for insulation include mineral wool, fibreglass insulation, sheet insulation, and spray foam insulation.

Consulting an insulation professional can help you determine the most suitable option for your specific situation, keeping in mind loft insulation cost and efficiency in energy use.

How often should I check my loft space for issues related to insulation, such as loose fill or blanket insulation problems?

Inspecting your loft at least once a year for potential insulation problems, such as dampness, poor ventilation, or structural issues, is a good practice.

Regular inspections can help you identify and address issues promptly, ensuring your insulation, whether it’s loose fill insulation, blanket insulation, or another type, remains effective and efficient.

Do I require planning permission to install loft insulation, especially when I'm considering loft conversions?

In most cases, you will not need planning permission for installing loft insulation, as it is considered a home improvement rather than a significant alteration.

However, if you live in a listed building or a conservation area, or are considering loft conversions, you may need to obtain permission before undertaking any insulation work.

It is best to consult your local planning authority for specific guidance.

Can I insulate my loft myself using DIY loft insulation, or should I hire a professional for installing loft insulation?

While it is possible to perform DIY loft insulation using insulating rolls, insulation boards, or other insulating material, hiring a professional is often the better option.

Professionals have the necessary expertise and equipment to install insulation correctly and safely, taking into account electrical wiring and other potential hazards.

They can also advise you on the best type of insulation for your specific situation and ensure that your loft meets all relevant building regulations.

How can I determine if my loft insulation, such as existing insulation, needs to be replaced or upgraded?

Signs that your existing insulation may need replacement or an upgrade include uneven heating or cooling in your home, increased energy bills, or visible damage to insulation materials like mineral wool or blown fibre insulation.

If you suspect that your insulation may need to be replaced or upgraded to improve your home’s energy efficiency and comfort, it is a good idea to consult a professional insulation installer for an assessment.

How much does loft insulation cost, and can I get free loft insulation?

The cost of loft insulation can vary depending on factors such as the type of insulation material, the size of your loft, and the complexity of the installation process.

On average, loft insulation prices range from £300 to £1,500 for materials and installation.

Keep in mind that investing in loft insulation can lead to significant energy savings and lower heating bills over time, making it a cost-effective home improvement project.

Some homeowners may be eligible for free loft insulation through government schemes such as ECO4.

Can I use spray foam insulation, and how much do spray foam insulation costs?

Spray foam insulation is a popular insulation method, offering excellent thermal performance and air sealing properties.

However, spray foam insulation costs can be higher than other insulation options.

The exact cost will depend on the size of your loft and the thickness of the insulation required.

A professional insulation installer can provide you with a more accurate estimate for your specific situation.

Are there any concerns with asbestos loft insulation?

Asbestos loft insulation can pose serious health risks if disturbed or damaged, as it releases hazardous fibres into the air.

If you suspect that your loft contains asbestos, it is crucial to have it inspected by a professional surveyor.

If asbestos is confirmed, you should arrange for its safe removal by a licensed asbestos removal contractor.

It is essential not to disturb it when removing loft insulation, as this could release harmful fibres.

How do I ensure proper ventilation when you have insulation installed?

Proper ventilation is crucial when installing loft insulation to maintain good indoor air quality and prevent moisture-related issues.

A well-ventilated loft will also help extend the lifespan of your insulation materials. To ensure adequate ventilation when installing insulation, consider the following:

  • Maintain an air gap between insulation materials and roof sheathing.
  • Install ridge vents along the peak of your roof.
  • Add soffit vents at the eaves of your roof to allow fresh air to enter.
  • Use a ventilation fan to actively circulate air in your loft space.
  • Consult an insulation professional to ensure proper ventilation in your loft.

How can I reduce my carbon footprint and energy bills with insulation?

By insulating your loft effectively, you can significantly reduce your home’s heat loss, leading to lower energy bills and a smaller impact on the environment.

Insulation materials such as mineral wool, sheet loft insulation, and spray foam can help maintain a comfortable indoor temperature and contribute to efficiency in energy use.

Additionally, sealing gaps around windows, doors, and the loft hatch can further enhance energy efficiency and reduce your carbon footprint.

What is the difference between insulation rolls, insulation boards, and loose fill insulation?

Insulating rolls, boards, and loose fill insulation are all types of insulating materials designed to reduce heat transfer and improve effectiveness of energy use.

Here’s a brief overview of each:

  • Insulation rolls: Typically made of mineral wool or fibreglass, they are flexible, making them easy to fit between joists and rafters. They’re suitable for having your loft insulated with regular spacing and are relatively easy to install.
  • Insulation boards: These rigid panels, often made from foam or compressed fibres, offer a higher insulation value per inch than rolls. They can be used for insulating walls, floors, and ceilings, but their installation requires more precision and skill.
  • Loose fill insulation: Made from materials like cellulose, mineral wool, or fibreglass, loose fill insulation is blown into cavities or spread evenly across the loft floor. It’s ideal for irregularly shaped spaces and can conform around obstacles such as electrical wiring.


Does loft insulation need ventilation? ›

However, what some homeowners don't realise is that proper ventilation is needed as well. An insufficiently ventilated loft space can cause all sorts of long-term damage to the roof, especially in older properties.

What is the most common result of poor attic insulation and ventilation? ›

Reduced Energy Efficiency

As mentioned, without proper attic ventilation, hot air gets trapped inside and causes temperatures to rise. This heat can then transfer into the living spaces within your home, making it more difficult to regulate the temperature.

What are the ventilation requirements for loft insulation? ›

The ventilation must meet the all of following guidelines. There should be a clear 50mm of air space between the insulation and the roofing felt. If roof trimmers or hips restrict the passage of air from the eaves to the ridge, you can drill a series of 25mm holes into these members to allow a continuous airflow.

Can poor attic ventilation cause humidity? ›

To keep this part of your home in good shape and prolong its life, you must maintain good airflow in your attic. Poor ventilation can cause a buildup of hot and humid air, resulting in moisture-related issues like mold, rot and poor indoor air quality.

How much does it cost to ventilate an attic? ›

Pricing for attic fan installation varies depending on fan type and its location. On average, labor costs run between $100-$300 and the fan itself may range from as little as $50 to more than $500. Whole-house fans tend to have higher overall costs than attic ventilation fans.

What are the disadvantages of attic ventilation? ›

While attic fans provide the same kind of ventilation as roof vents, there are a few downsides. If a solar-powered fan won't work for your location, you'll need to hard wire one in. Also, if the house is “leaky,” the fan could actively be pulling warm air from the home or other areas of the roof.

What is the disadvantage of loft insulation? ›

Disadvantages: Insulating at rafter level is much more expensive than most standard loft insulation. As well as insulating the roof, you will have to insulate any gable walls, party walls and chimneys in the loft space. If you leave these uninsulated, then the heat will bypass your new insulation making it ineffective.

Does loft insulation prevent damp? ›

Loft insulation in itself is not responsible for damp appearing in your property – however, it can be a contributing factor when it comes to the spread of damp via condensation.

Can poor insulation cause humidity? ›

Weak insulation and drafty walls

In addition to humidity issues, poorly insulated walls let in drafts, meaning your whole home will use more energy in order to maintain a comfortable temperature. Energy-efficient retrofits for your walls, attic and basement can go a long way.

Can poor attic ventilation cause mold? ›

Poor attic ventilation can cause all sorts of serious problems, such as ice dams, mold and mildew, and a shortened roof lifespan. Without proper ventilation, moisture can end up significantly damaging the roofing system.

Can loft insulation cause health problems? ›

There are real dangers from old loft insulation within houses, which can contain asbestos, a carcinogenic material. For newer insulation however, as long as precautions are taken during handling and installation, they will not be dangerous to the health of users.

Can a loft have too much ventilation? ›

Having too many vents in your roof can increase the chances of water leaking into your loft space and causing damage. Not enough and moisture won't be able to escape, leading to problems associated with condensation build up. The amount of ventilation required is dependent on your roof size, shape and material.

What is the rule for attic ventilation? ›

Most codes use the 1/300 rule for minimum residential attic ventilation recommendations. This means that for every 300 square feet of enclosed attic space, 1 square foot of ventilation is required – with half at the upper portion (exhaust vents) and half in the lower portion (intake vents).

Is loft insulation breathable? ›

It's easy to fit, water-repellent and breathable so you won't get rot or mould. Planning to use your loft for storage? Going for rigid insulation boards could save you time and effort, as you get boards and insulation in one.

What causes excessive moisture in attic? ›

What Causes Attic Condensation. There may be multiple causes of attic condensation in your house. Poor attic insulation, as well as poor ventilation, can cause your attic to trap humid air from your home. Improperly vented bathroom and dryer exhausts can also cause attic condensation.

What happens if attic is not vented? ›

What happens if your attic is not vented? If an attic is not properly ventilated, whether caused by a lack of vents or blocked vents, ice dams can form in winter, the HVAC system can become overworked, indoor air quality can be affected, and the roof sheathing can begin to rot.

How do I reduce moisture in my attic? ›

4 Ways to Reduce Moisture In Your Attic
  1. Keep the Rest of Your Home Dry. ...
  2. Ensure Your Attic Is Properly Ventilated. ...
  3. Ensure Your Bathroom and Dryer Vents Are Properly Ventilated Too. ...
  4. Get Your Attic Inspected for Air Leaks.

What is the most efficient attic ventilation? ›

Exhaust ventilation is most efficient when it's installed at or near the highest point of your roof where hot, humid air can easily escape. Exhaust vents are divided into three common categories: static, powered, and mechanical.

Should attics be vented in winter? ›

If you're not currently ventilating your attic in the winter time, you may be doing your home a disservice. Attic ventilation not only helps your home stay comfortable throughout the cold months, but it also helps protect your home from damaging moisture that can be caused by roof structures.

Do attics need to be vented in winter? ›

Roof ventilation is important year-round. During the winter, your home's roof vents allow moisture to leave the attic space, preventing the growth of mold and mildew that can occur even during this typically dry period. You should absolutely leave your roof vents open during the winter – do not cover them!

Should you put a dehumidifier in your attic? ›

Controlling this excess moisture from your attic is crucial for your health and safety. For that, a dehumidifier could be a good solution to control the excess humidity in your attic. This device can automatically control your desired humidity level and continuous drainage without any noise.

Do attic fans help with ventilation? ›

Attic fans do work. They will help circulate air in your attic and ventilate the space, so it stays closer to the outside temperature. Attics can reach incredibly high temperatures in the hot summer months and gather excessive moisture in the winter. Attic fans will help fight these problems.

Where not to put loft insulation? ›

Don't place insulation directly over downlights. Use a downlight cover such as a Loft Lid before rolling insulation over the fittings. Don't block any vents such as soffit vents with insulation. Don't squash the insulation as this can reduce its thermal performance by over 50%.

How long is loft insulation life expectancy? ›

Much like cavity wall insulation, loft insulation is designed to last for the entire lifespan of the house, providing energy bill savings of around £250 for each one of those years that it is installed.

Should I remove loft insulation? ›

If you find that your old loft insulation is wet, then this may be a situation when you do need to remove it. Leaving wet insulation there and placing new insulation on top will cause the dampness to spread. This will only lead to mould, and potentially rot.

What is the best loft insulation for damp loft? ›

However, with regards to loft insulation, one of the best things you can do is install natural insulation made of sheep's wool. This eco-friendly form of insulation is hygroscopic, which means it's able to absorb and wick away moisture incredibly effectively, tackling condensation before it becomes an issue.

What is the best loft insulation to prevent condensation? ›

By far and away the easiest way to prevent condensation in your loft space is to install Icynene spray foam insulation. This is because Icynene battles both interstitial condensation and condensation.

What is the best insulation for damp places? ›

Spray Foam Insulation is Ideal for Use in Crawl Spaces

Most builders and contractors agree that spray foam is a far better product for use in a potentially damp environment. Spray foam repels water, immediately attached to whatever surface you spray it on, and is resistant to biological growth.

Can too much loft insulation cause condensation? ›

Too much Insulation with a minimum amount of ventilation will result in condensation forming as the warm air has nowhere to escape to. It can also result from insulation being improperly installed such as too many layers being laid on top of each other or if it is too tightly packed.

Can loft insulation cause condensation in the house? ›

Lofts can't just chip off a layer of insulation, so the need to breathe is far more important. So, can too much loft insulation cause condensation? Yes it can, and it can cause havoc in your home as well.

Can too much insulation cause damp? ›

There are occasional horror stories reported of insulation said to be causing damp issues. This shouldn't be the case when insulation is installed properly, and as long as the home was suitable for the insulation method chosen – but insulation is not the solution to an existing damp problem.

How do you know if you have poor ventilation? ›

Signs of Poor Ventilation

Windows and glass that appear frosted due to condensation. The discoloration of floor, wall tiles, and grout. Early signs of rust stains on plumbing. Mold growth on structural surfaces like walls and wood.

Will soffit vents stop condensation? ›

Soffit Vents help to create a flow of fresh air into the attic or roof space of your home. Ventilation in the roof space will help reduce condensation during the cooler winter period and help to remove excess heat and any moisture during the warmer summer months.

Is modern loft insulation safe? ›

Fibreglass insulation is also known to absorb moisture, and once it becomes damp, it promotes the growth of mildew and mould. If these spores are spread in the air, they can be harmful to human health, causing breathing problems, and being extremely hazardous to those who already suffer from allergies and asthma.

Is too much insulation in attic bad? ›

Excess insulation in the attic can make a house too tightly sealed and block vents. If airflow is blocked, moisture can't escape. If moisture accumulates in the attic and comes into contact with warm air, that can allow mold to grow, which can result in serious respiratory problems in people.

When was fiberglass insulation banned? ›

In 2011, the National Toxicology Program (NTP) removed all biosoluble glass wool, such as fiberglass used in home and building insulation and for non-insulation products from its “Report on Carcinogens.”[3,4] California's Office of Environmental Health Hazard Assessment (“OEHHA”) published a modification to its ...

How do I know if my loft is well ventilated? ›

Go outside an look up at the underside of your eaves. If you can see vents then go up into your loft and make sure they aren't obstructed by insulation. If it is simply move it back from the vents and make sure there's adequate room for the air to circulate.

How common is loft condensation? ›

Finding condensation in attic is surprisingly common. It is estimated that at least 1 in 5 homes are affected by this issue. First tell-tale signs include finding damp in loft or water accumulation on the inside of roof tiles or roof membrane.

Can I put a dehumidifier in the loft? ›

If you find that your loft space is too humid, you can use a dehumidifier to reduce the humidity. A dehumidifier will not work in an undeveloped loft space because it will be taking the fresh air that comes from under the eaves, which is very inefficient.

What is the 1 300 rule for attic ventilation? ›

What Is the 1:300 Rule? The US Federal Housing Authority recommends a minimum of 1 square foot of attic ventilation for every 300 square feet of attic floor space, evenly split between intake and exhaust.

What is the most effective way to vent moisture from an attic space or under a roof? ›

Insert Roof Vents

Roof vents are typically set at a roof's peak, where the attic's air naturally rises. Adding roof vents to your attic can ensure warm, moist air is able to escape, preventing heat buildup and condensation. You will need to periodically check your roof vents to make sure they are debris free.

What is the 1 150 rule for ventilation? ›

The IRC requires 1 square foot of net free ventilation area to every 150 square foot of attic floor space (1/150), but does not specify the location of intake vents or exhaust vents, nor does it specify the ratio of intake to exhaust.

Does loft insulation make house hot in summer? ›

Does insulation make your house hotter? "Insulating homes has very little, if any, impact on the risk of overheating," said Professor Kevin Lomas from Loughborough University, who led the largest national study so far into overheating in homes.

What is the best depth for loft insulation? ›

Since 2003, current building regulations recommend a depth of at least 270mm (mineral or glass wool) in the loft – use this as a starting point rather than a finishing line to see larger savings. In 1995, the recommended depth was 200mm. Prior to that it was less than 100mm.

Will a dehumidifier get rid of condensation in the attic? ›

Can you put a dehumidifier in the loft? A loft dehumidifier, much like a basement dehumidifier, aids in preventing condensation, dampness, and moisture damage in your attic. Moisture that is trapped in a loft can harm stored things and result in dampness, mould and mildew, bad odours, and property damage through rot.

Can poor attic ventilation cause high humidity? ›

There are three general reasons why humidity can become high in an attic: 1) poor ventilation; 2) improper insulation; and 3) heated air from living areas getting into the attic.

Should an attic be airtight? ›

Air sealing an attic goes a long way to maintain your home. Besides keeping energy costs low, it'll mainly help to keep your home feeling comfortable long-term. Without a sealed attic, hot air can get inside the living space (heat gain) during warmer months and get outside (heat loss) during colder months.

Is condensation in loft a problem? ›

Condensation building up in lofts and roof spaces has become an increasingly common problem for property owners in recent years, and if you don't notice it early and take action that condensation can lead to serious issues like damp, black mould, and your timber starting to rot.

How do I dry out my loft? ›

The Solution. I've found the most effective way to cure loft condensation is to install ventilation so a breeze can enter the loft and pull the moisture out of the loft into the atmosphere (this method works for most lofts in the UK but not “warm roofs”).

How do you dry out loft insulation? ›

If the fibreglass insulation is found wet, remove the affected area and place it in a warm place to dry out naturally with lots of ventilation. Once dried, you can install the fibreglass insulation back in place. If this is not possible you will have to throw the insulation away and replace it.

Is it cheaper to run an attic fan or air conditioner? ›

Attic fans are more energy-efficient than air conditioners, as they'll typically use no more than 10 to 15 percent of the power needed to run an air conditioner, making an attic fan a more affordable cooling option.

How much warmer should attic be than outside in winter? ›

The ideal attic temperature should be no less than 60 degrees in the winter and no more than 10 to 20 degrees above the outdoor temperature in the summer. If your attic temperature climbs above 130 degrees, you may start running into issues with your energy bill, as well as the integrity of your roof.

Does a cold roof need ventilation? ›

This ventilation space is incredibly important for a cold deck roof as otherwise when the warm air passes through and changes temperature, if it can't escape it produces water droplets which can then cause damage to your ceiling.

Should my attic be hot or cold in winter? ›

If you're concerned about attic temperature control, a specific attic temperature range should help. Make sure your attic is no colder than 60 degrees Fahrenheit and no warmer than 10 degrees above the outside temperature.

Should you wear a mask when laying loft insulation? ›

We recommend a FFP3-rated disposable dust mask when working in the loft, especially when handling or cutting loft insulation. Look for ones with a valve for easier breathing.

Should loft insulation be pushed up to the eaves? ›

One important thing to remember is that insulation should never be pushed right into the eaves because it will interfere with airflow. If you're going for a warm loft then you'll need much more insulation to be able to cover the underside of the roof along with the gable and party walls.

Should I vent my loft hatch? ›

Water vapour entering the loft increases the risk of condensing at the inside of the roof slope or other cold surfaces such as water tanks. To reduce the chance of condensation, you need to increase ventilation in the attic to try to remove the water vapour that is generated before condensation occurs.

Does some loft insulation cause condensation? ›

Too much Insulation with a minimum amount of ventilation will result in condensation forming as the warm air has nowhere to escape to. It can also result from insulation being improperly installed such as too many layers being laid on top of each other or if it is too tightly packed.

Is too much loft insulation bad? ›

As long as you ventilate your property properly, you can have as much insulation as you like within reason. The trick with loft insulation is to balance the amount of insulation you have with the amount of ventilation necessary to prevent damp. As long as you get that balance right, you should be fine.

Can you put things on top of loft insulation? ›

Placing boards over your insulation can be a great idea if done correctly. By boarding over your loft insulation, you can create a lot more storage space whilst creating a safe and stable environment.

Is it OK to sleep in a room with exposed insulation? ›

"Fiberglass insulation should never be left exposed in an occupied area, according to the American Lung Association," says ALA's Godfrey. "Exposed fiberglass insulation, once in the air, does cause respiratory reactions, such as dry, scratchy throat and coughing, as well as acting as a skin and eye irritant.

What is the best thickness for loft insulation? ›

Since 2003, current building regulations recommend a depth of at least 270mm (mineral or glass wool) in the loft – use this as a starting point rather than a finishing line to see larger savings. In 1995, the recommended depth was 200mm. Prior to that it was less than 100mm.

Should loft insulation touch roof? ›

The general advice we give is that you should always insulate between and above the rafters (warm roof) or between and under the rafters (cold roof).

Should I remove old loft insulation? ›

In most circumstances removing your old insulation isn't necessary and it can actually be quite beneficial to leave it. This is as most insulation will retain its thermal properties so leaving it in place will mean that you continue to benefit from it whilst also having an additional layer of insulation on top!

How do you tell if your attic is properly ventilated? ›

In the Summer: On a hot day, touch your ceiling with your hand. If it feels warm, this is a tell-tale sign that your attic is storing hot air. This interferes with your home's ability to stay cool and comfortable and shows that more ventilation is needed.

How do you dry out a damp loft? ›

The Solution. I've found the most effective way to cure loft condensation is to install ventilation so a breeze can enter the loft and pull the moisture out of the loft into the atmosphere (this method works for most lofts in the UK but not “warm roofs”).


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Author: Carlyn Walter

Last Updated: 30/06/2023

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Author information

Name: Carlyn Walter

Birthday: 1996-01-03

Address: Suite 452 40815 Denyse Extensions, Sengermouth, OR 42374

Phone: +8501809515404

Job: Manufacturing Technician

Hobby: Table tennis, Archery, Vacation, Metal detecting, Yo-yoing, Crocheting, Creative writing

Introduction: My name is Carlyn Walter, I am a lively, glamorous, healthy, clean, powerful, calm, combative person who loves writing and wants to share my knowledge and understanding with you.