Order Line 0330 123 4123
Get answers to frequently asked questions with our loft insulation FAQs
On average, about 25% of household heat escapes through an uninsulated roof.
Building Regulations recommend a minimum of 270mm thickness, comprising of a 100mm bottom layer between ceiling joists and a 170mm top-up layer above. This should be laid at a 90º angle to the bottom layer to ensure coverage of the timber ceiling joists.
If well-fitted and in good condition, there is no need to replace your insulation. You can simply lay new insulation on top of it to reach the recommended 270mm thickness.
You must ensure a 25mm air space is maintained at the eaves between the loft insulation and the roofing underlay. If you block ventilation to your loft space you may get problems with condensation.