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Roof Insulation Cost Guide

Many homeowners struggle with their loft space becoming a neglected storage area. However, with a small investment, it can be transformed into an efficient layer of insulation, keeping the house warmer during the winter months. This article will discuss the cost of roof insulation, factors influencing the cost, ways to save money on roof insulation, the best type of insulation, what goes into roof insulation, and how to hire a professional.

The guide will cover various types of roof insulation, including warm roof insulation and fibreglass roof insulation, as well as the cost of hiring a roof insulation specialist.

How much does roof insulation cost?

Cost of installing roof insulation

The cost of installing roof insulation in the UK can vary depending on the size of the project and the type of insulation used. The cost of installing roof insulation for a terraced home can range from £400 to £2,000, while for a semi-detached home, it can range from £600 to £3,000. For a detached home, the cost can range from £900 to £5,000.

The type of insulation used and the materials used to insulate the roof can also affect the cost of installation. Fibreglass insulation for a pitched roof covering an area of 20 square metres can cost between £400 and £500, while mineral wool rolls for a pitched roof of the same area can cost between £500 and £600. Warm deck insulation boards for a flat roof of the same area can cost between £600 and £700.

Please note that these prices are just estimates and may vary depending on the specific project requirements. It is recommended to get a quote from a qualified roofer like ProGuard exteriors to determine the exact cost of the project.

The table below provides a summary of the estimated cost of installing different types of insulation for different types of roofs:

TYPE OF INSULATIONTYPE OF ROOFAREA COVEREDINSTALLATION TIMECOST
Fibreglass InsulationPitched Roof20 Square Metres1 Day or Less£400-£500
Mineral Wool RollsPitched Room20 Square Metres1-2 Days£500-£600
Warm Deck Insulation BoardsFlat Roof20 Square Metres1-2 Days£600-£700

Labour cost of installing roof insulation

In addition to the cost of materials, labour costs can also contribute to the overall cost of installing roof insulation. Labour costs typically range from £200 to £400 per day, with blown fibre insulation installers charging more due to the specialised equipment needed.

The installation time can also vary depending on the size of the property and the type of roof. For a terraced or semi-detached house, the installation can typically be completed in three to four hours, while for a detached home, it may take between four and six hours to finish.

Overall, the cost of installing roof insulation can vary depending on several factors, including the size of the project, the type of insulation used, and the materials used to insulate the roof. It is recommended to get a quote from a qualified roofer to determine the exact cost of the project.

Process Involved in Starting a Roof Insulation Project

Installing roof insulation is a simple process that can significantly prevent heat from escaping your home. However, it is recommended to hire a qualified and experienced tradesperson to ensure the best results. Before choosing a certified contractor to install insulation on your roof, it is important to be aware of the steps involved in the procedure.

The first step is to determine the type and size of the roof that needs to be insulated. A roof installation professional will assess the roof before you hire a tradesperson to complete the installation. They will also discuss the level of quality and materials to be used and advise you on the techniques and supplies that are best suited for your particular set of circumstances.

Before beginning the installation, the tradesperson will examine the ease of access to your roof and check for any failed insulation that may need to be removed. They will also ensure that there is no condensation or dampness in the attic space, which could compromise the effectiveness of the new insulation.

Once the area is tidy and clear of any obstacles, a skilled roof insulation crew can start installing the new insulation. It is best to speak with the professional first to get their opinion on how long the job will take and what is involved. This will depend on whether or not you have existing insulation that can be added to or dangerous insulation like asbestos that needs to be removed before the fresh material is put in.

During the installation process, the tradesperson will use a range of techniques and materials to ensure that the insulation is properly installed. They will also advise you on the benefits of each material and any pricing differences between the techniques.

To ensure the best results, it is important to hire a qualified and experienced tradesperson to install your roof insulation. By following these steps, you can ensure that your home is properly insulated and energy-efficient.

Different Types of Roof Insulation

Fibreglass Wool Insulation

Fibreglass wool insulation is a popular choice among homeowners due to its effectiveness and affordability. This type of insulation is made by heating and spinning thin glass strands to create a thick fibre that resembles wool. It can be purchased in lengthy rolls, making it a practical option for insulating roofs.

The cost of fibreglass wool insulation typically ranges from £25-£30 per square metre, making it one of the more cost-effective options available.

Mineral Wool Insulation

Rock or mineral wool insulation is another cost-effective option that can be obtained in large mats or rolls, similar to fibreglass wool insulation. This type of insulation is made by heating and spinning minerals like dolomite to create a dense, wool-like fibre.

The cost of mineral wool insulation is typically around £20-£30 per square metre, making it a slightly cheaper option than fibreglass wool insulation.

For those seeking a more environmentally friendly option, sheep wool insulation is also available in large rolls, similar to rock and fibreglass wool insulation. However, this natural alternative can be significantly more expensive, costing between £50-£60 per square metre.

Polyester Fibre Insulation

Rolls of plastic or polyester fibre insulation are a less hazardous option than sheep wool insulation and are comparable in effectiveness. They are also a more environmentally responsible choice, as they are often made from recycled materials.

Polyester insulation typically costs around £35 per square metre, making it slightly more expensive than fibreglass wool insulation but still a practical option for those looking for an affordable and eco-friendly insulation solution.

Overall, homeowners have a variety of options to choose from when it comes to roof insulation, with fibreglass wool, mineral wool, and polyester fibre insulation being among the most popular and cost-effective choices.

Factors that Affect Roof Insulation Cost

When insulating your loft, it is important to consider the factors that can affect the cost. Knowing these factors can help you make informed decisions and stay within your budget. The following are some of the factors that can affect roof insulation cost:

Choice of Insulation

The type of insulation you choose can greatly affect the cost of insulating your roof. Blanket and loose-fill insulation are the least expensive options, costing between £150 and £200. On the other hand, blown fiber insulation is the most expensive, with a starting cost of approximately £1,500 for a terraced house and up to £4,000 for a detached home.

While cost is an important consideration, it is also important to consider the long-term value of the insulation and the cost of needing to replace it in the future.

The Size of Your Loft

The size of your loft is another factor that can affect the cost of roof insulation. The larger the loft, the higher the cost of insulation. For example, blanket insulation in a terraced house can cost between £250 and £450, while the same material can cost up to £600 for a separate property.

It is important to consider what is best for your house in the long run, rather than just the initial cost.

Ease of Access

The ease of access to your loft can also affect the cost of insulation. If the space is difficult to access, it can make it harder for workers to fit the insulation, resulting in higher labour costs.

While spatial problems cannot be eliminated, preparing workers for the space can help avoid unexpected costs at the end of the job.

Thickness of Roof Insulation

The thickness of your roof insulation can also affect the cost. According to the National Insulation Association (NIA), cellulose requires 220mm, rock wool requires 250mm, and glass wool requires 270mm. The current EEC program rules require a minimum of 270mm of loft insulation.

If you are unsure about the type of insulation you have, it is recommended to consult with an expert installer to ensure you have enough to keep you warm.

Considering these factors can help you make informed decisions when insulating your roof and stay within your budget.

How to Reduce Roof Insulation Cost?

When it comes to reducing roof insulation cost, there are a few things to keep in mind. First and foremost, it’s important to select the optimum insulation for your space. This will ensure that you’re not overspending on insulation that won’t provide the best results.

Another way to reduce insulation cost is to make the location simpler to access. This will help ensure that traders aren’t caught off guard when they come out to meet you to finish the work. Warning them ahead of time that the location might be difficult to get to can also help save money.

It’s also important not to skimp on the installation process. Proper installation is key to ensuring that your insulation lasts for its projected lifespan of forty years. By installing the loft insulation correctly the first time, you can prevent any alterations that aren’t necessary and save money in the long run.

Overall, taking these steps can help you reduce your roof insulation cost without sacrificing the quality of your insulation.

Choosing the Right Roofer for the Job

When it comes to installing or repairing your roof insulation, it is essential to choose the right roofing professional to ensure the job is done correctly. Here are some tips to help you select the best contractor for your project:

  • Conduct research on local professionals in various trades to find the best roofer for your needs.
  • Verify that your chosen tradesperson has the necessary training and expertise to complete the job to a high standard.
  • Request quotes from at least three different contractors to ensure that you get the best deal.
  • Discuss the insulation techniques and materials that the tradesperson recommends for your project.
  • Never pay the entire amount upfront and insist on a detailed cost breakdown at all times.
  • If a deposit is required, ensure that you have written documentation of all transactions, including the total cost.

At ProGuard Exteriors, we have a team of experienced and qualified roofers who have worked on numerous roof insulation projects. Contact us today for a free estimate and to discuss your roofing needs.

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