Internal Wall Insulation - Getting Started - Solid Walls – How do I insulate solid walls?

In the following articles, we present our options to insulate solid wall buildings whilst allowing them to maintain vapour permeability, as requested by Building Regulations (English Part L1B 3.8 & 3.12, Welsh Part L1B Section 12). There are two methods of insulating solid walls: externally and internally. But before you start, make sure your walls are dry - a dry wall will be 30% more insulating than a wet wall!

Internal Wall Insulation is applied from the inside and may necessitate the removal of all fittings e.g. radiators, skirting boards, architraves etc. It can therefore be more involved than External Wall Insulation. It must be carried out correctly, even if you are using appropriate materials. Otherwise you can risk increasing the chance interstitial condensation.

The options explained in the following articles are graphical representations of some of our solutions, please contact us should you require an actual calculation undertaken for your specific situation. Please note your architect should then consider any problems of the site and any detailing required such as use of a breather membrane.

Options Include 

• Schenider Woodfibre Boards 
• Amorim Cork Boards 
• Celenit Wood Wool Boards & Thermafleece Cosywool Insulation 
• Schenider Woodfibre Boards Thermafleece Cosywool Insulation 

PLEASE NOTE: when insulating internally, you must protect from driving rain/moisture ingress.

The U-value of a wall is a measure of the rate at which heat passes through the wall and so is a measure of how well insulated the wall is and is expressed in terms of “Watts per meter squared-Kelvin” (W/m2K). The lower the U-value, the better the performance of the insulation and the less it will cost to heat your home. For building regulations in an existing building, a U-value of around 0.30W/m2K or lower is recommended (but please refer to current building regulations). Carrying out a whole house energy survey is useful. Building control often allow less insulation & should follow part L1B & the British Standard 7913 reference solid wall buildings. The reduction in space, aesthetic, environmental impact of the material used and whether or not the building is listed will all have some bearing on what you ultimately choose or can practically achieve, please call our Product Advisers to discuss your requirements.