ᐅ Attic Conversion – Is Adding Insulation to the Knee Wall / Short Wall Necessary or Beneficial?
Created on: 27 Feb 2014 20:52
K
killbill
Hello,
we are currently renovating our roof space. Two levels (attic + loft) will provide 160 sqm (1,722 sq ft) of living area.
On the first level, we built a 40 cm (16 inches) high concrete knee wall, on top of which a 60 cm (24 inches) high laminated timber beam was installed to raise the roof.
Current structure of the concrete knee wall:
The area outside the added purlin will be insulated during exterior plastering work to match the level of the rest of the exterior facade.
About the remaining masonry:
The house was built in 1986 using 36.5 cm (14 inches) Poroton bricks with 2 cm (0.8 inches) lightweight plaster. No external facade insulation will be added for the time being, meaning the knee wall’s exterior must remain as it is.
Is the existing knee wall insulation (pre-built Poroton + Heraklith wood fiber board + lightweight plaster) sufficient in relation to the rest of the masonry (36.5 + 2), or would it be advisable to add insulation on the inside? I’m mainly concerned about preventing a shift of the dew point and avoiding later moisture or mold buildup on the interior concrete surface.
If additional internal insulation is recommended, what type and method would be best?
Maybe also interesting:
The new roof has 20 cm (8 inches) of insulation between rafters plus 10 cm (4 inches) of wood fiberboard insulation above the rafters.
Underfloor heating will be installed throughout the entire lower area of the apartment.
Thanks in advance for your advice!
Best regards
we are currently renovating our roof space. Two levels (attic + loft) will provide 160 sqm (1,722 sq ft) of living area.
On the first level, we built a 40 cm (16 inches) high concrete knee wall, on top of which a 60 cm (24 inches) high laminated timber beam was installed to raise the roof.
Current structure of the concrete knee wall:
The area outside the added purlin will be insulated during exterior plastering work to match the level of the rest of the exterior facade.
About the remaining masonry:
The house was built in 1986 using 36.5 cm (14 inches) Poroton bricks with 2 cm (0.8 inches) lightweight plaster. No external facade insulation will be added for the time being, meaning the knee wall’s exterior must remain as it is.
Is the existing knee wall insulation (pre-built Poroton + Heraklith wood fiber board + lightweight plaster) sufficient in relation to the rest of the masonry (36.5 + 2), or would it be advisable to add insulation on the inside? I’m mainly concerned about preventing a shift of the dew point and avoiding later moisture or mold buildup on the interior concrete surface.
If additional internal insulation is recommended, what type and method would be best?
Maybe also interesting:
The new roof has 20 cm (8 inches) of insulation between rafters plus 10 cm (4 inches) of wood fiberboard insulation above the rafters.
Underfloor heating will be installed throughout the entire lower area of the apartment.
Thanks in advance for your advice!
Best regards
killbill schrieb:
.....Is the existing knee wall insulation setup (pre-built Poroton + Heraklith + lightweight plaster) sufficient compared to the rest of the masonry (36.5 + 2) or would it be advisable to add additional insulation from the inside? My main concern is to avoid shifting the dew point and preventing moisture or mold from forming on the interior concrete surface later on... Your designer should be able to calculate that! Best regards
