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Recommended R Value For Attic Insulation

R Value For Attic Insulation

In this article we are going to run you through our professional opinion on the R Value For Attic Insulation, we hope to answer any you have around the matter - however we understand it is always tricky to do so through one article. If you have any queries after reading this article please feel free to get in touch and speak to one of our industry experts. 

If you’re not looking forward to facing this Winter’s heating bills, then the likelihood is, the insulation in your home is not doing its job, or you’re lacking adequate insulation.

Home insulation is the most important barrier that you have against heat loss, and one of the only things that is capable of protecting your home against the harsh British Winters.

UK residents face incredibly high energy bills every year, with the insulation in our homes being one of the major reasons as to why.

Going into the future, there is a pressing need to combat the seemly endless problems with the housing in our country, with the first step being to increase the insulation quality in our homes. As our primarily heat retention barrier, insulation is no longer simply a basic home improvement, but a necessity.

There are a number of ways that the UK is advancing its insulation, with different calculations used to evaluate the insulation in homes and the resulting heat retention of properties.

These calculations combat both our extraordinarily high energy bills, and our need to keep conserving energy in any way possible. Of the calculations used, the recommended R value for attic insulation is very important.

But, what exactly is an R value, and what is the recommended R value for attic insulation? It’s time to find out…

What Is An R Value For Attic Insulation?

An R value is calculated to give a value to a material’s thermal resistance. Effectively, this means how much heat is able to transfer through the material. The value is calculated through a simple calculation:

Material thickness (metres) divided by thermal conductivity (W/mK) equals R (m2K/W)

While it isn’t necessary for you to put the calculation to use when deciding which insulation to use, it is of incredible importance to know where you stand with the insulation quality that you are considering. In particular, the recommend R value for attic insulation.

In the UK, as of 2003, the government recommends that houses should have at least 270mm of insulation. A number that has grown considerably since the recommended value of 25mm in 1965.

However, in the 2013 government insulation statistical report, any home that has more than 125mm of insulation is considered to be insulated.

As thickness is only one part of the equation, it doesn’t quite determine how effective your attic insulation is going to be. The conductivity of the material has to be taken into account.

In many cases, thicker insulation doesn’t always translate to a better insulation. Currently, the recommended R value for attic insulation is between 6.1 and 7, a combination of thickness and conductivity.

R Value For Attic Insulation

Knowing where you stand with the recommended R value for attic insulation will ensure that you receive the right insulation for your home. But as always, expert advice can go a long way to ensuring that your insulation is giving your property its best chance to be energy efficient

What Insulation Material Can I Use?

The big question for UK homeowners is how can they achieve the recommended R value for attic insulation in their own home. This starts with the material that you choose, and then follows on to what level of thickness you’ll need to meet the recommendations.

There is a large list of possible materials that can be chosen from, with some of the most common being:

Fiberglass batts– Glass strands formed into blankets. (R value per inch of between 3.0 and 4.0)

Loose fill fiberglass– Glass strands blown into an area. (R value per inch of between 2.2 and 2.7)

Loose fill cellulose– Primarily recycled material, like newspapers, blown into an area. (R value per inch of between 3.2 and 3.8)

Mineral wool batts– Recycled material formed into blankets. (R value per inch of around 4.5)

Spray foam– Expanding foam that completely fills an area. (R value per inch of between 3.5 and 3.6 for open-cell and between 6.0 and 6.5 for closed-cell)

Getting Advice From The Experts

When insulating your attic, it is important to both consider the thickness and thermal conductivity of the product that you are using.

Spray foam insulation doesn’t need to be anywhere near as thick as alternatives like loose-fill fibreglass, while loose fill cellulose and fibreglass batts will need to be a similar thickness.

If you’re worried about the performance of your current insulation, or want more information about modern insulation that meets recommendations, don’t hesitate to contact our professional insulation team at Home Logic. Simply call 0800 1700 636, or click the button below to get in touch with our team today!