right insulation thickness

The advantages of installing good insulation in a building are numerous. These include maintaining your home at a more comfortable temperature throughout the year, saving money on utility costs, improving the air quality within your home, and many more.


How Thick Should Loft Insulation Be?


Many homeowners who contact us need clarification about the ideal insulation thickness for their project. With so many alternatives available, it might be a difficult task for a novice, which is why we’ve created this helpful guide.

According to research, newly constructed homes must have loft insulation at least 270mm thick. You might find that you only have 25mm of insulation in your loft space, which was the standard thickness in the 1980s. If the existing insulation isn’t harmed, the desired consistency can be reached by simply laying new insulation on top of the current.

We advise using slab insulation or insulation rolls for lofts.

What Insulation Thickness Do I Need for Floors?

According to building codes, floors must reach 0.25 W/2mK or less at a minimum. 150mm of insulation would need to be installed, but the exact amount required would depend on your floor, your home’s size, and the type of insulation you install.


What Insulation Thickness Do I Need for Pitched Roofs?


We advise using the “warm roof” technique to insulate a pitched roof. In order to keep the roof timbers warm, insulation is put in two layers, one between the rafters. You could install 170mm of insulation and an additional 100mm of the board to reach the necessary 270mm of insulation. Remember that there should always be a 25mm air gap between your insulation and the underside of your roof tiles.


What Insulation Thickness Do I Need for Flat Roofs?

The U-Value of an uninsulated flat roof is approximately 1.5 W/m2K. One should aim for a 0.25 W/m2K or less figure while insulating one. To achieve this, it would be best if you used insulation boards with a combined thickness of about 150 mm to protect your flat roof. This is accomplished by placing around 100 mm of insulation over the deck and another 50 mm between the roof joists beneath the deck. This is how a flat roof may be made warm and well-insulated.

We hope this advice was helpful and that you now have the information you need for your insulation project. Please look at our fantastic range of Double S ® insulation today, with roof insulation material, flat roof insulation, floor underlay, wall insulation, damp-proof membrane, expansion joints, and packaging materials. If you’ve still questions, get in touch with our award-winning customer service team. They’ll be able to answer any questions you may have. 

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