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Supplementary thermal insulation for walls using Finnfoam renovation panels
Finnfoam's renovation panel S40 is intended specifically for interior supplementary thermal insulation. In general, supplementary thermal insulation can be implemented using Finnfoam's standard rebated insulation panels, but the renovation panel S40 is more suitable for applications where you want to minimize the increase in the size of the structures. The thickness of the renovation panel is 40 mm, and it measures 600 x 2,600 mm. The panel is attached to the wall with batten strips (20 mm x 50 mm) that fit into the recesses at the edges of the panel. Thus, the insulation is pressed in between the existing wall and the strip at the seams. The airtightness of the seam can be increased further by applying a flexible foam sealant or sealing paste on the seam. This will ensure that the insulation is continuous and eliminates thermal bridging. The interior cladding or paneling is attached to the batten strips. The structure saves space and is airtight. It also does not interfere with the behavior of the timber structures and improves the moisture performance of the wall. A flexible foam sealant is used to seal the top and bottom edges and any lead-throughs. This ensures that the new wall is continuous and air-tight, without cold corners or draft.
View an animation of supplementary thermal insulation...
By renovating an existing wall (U value 0.28) built to the previous standards (valid from 1985 to 2003) with the Finnfoam S40 renovation panels, the insulation capacity of the wall would improve more than 30%. The new U value of the wall after renovation would be approximately 0.20 W/(m2 K). In reality, the improvement might be even more significant, as the airtightness of the structure would also be improved. On average, the leakage rate of a timber framed house is 4. As the leakage rate is reduced to 1 by improving the airtightness, the energy consumption of a single-family house will be reduced by up to 15% as the result of the improved airtightness alone. The calculation of the U value does not consider the airtightness of the structure (leakage rate).
The relative improvement of the insulation capacity of even older walls would be more significant. If an existing wall was insulated with 100–120 mm of porous insulation material, the insulation capacity of the wall could be improved by more than 50% using Finnfoam S40 renovation panels. The U value of the wall would be 0.25.
The Finnfoam renovation panels have a high insulation capacity and have sufficient rigidity, even though the S40 panels are just 40 mm thick. The panels are comfortable to handle and easy to work on. The panels do not crumble or produce dust.
FI-300/40S renovation panel for supplementary thermal insulation
Thickness 40 mm
Width 600 mm
Length 2,600 mm
Supplementary thermal insulation of a wall with renovation panels.
Interior supplementary thermal insulation for a heated building using Finnfoam renovation panels