ᐅ Insulating an Extension with Exterior Walls Only 12 or 24 cm (Approx. 5 or 10 Inches) Thick
Created on: 5 Jan 2024 20:38
F
Fabian2024
Hello community,
I just have a few questions and maybe someone has some answers for me.
So, no rush—I know the building’s condition isn’t ideal.
About the building,
it is a two-story structure measuring 5 x 3 meters (16.4 x 9.8 feet); one of the 5-meter (16.4 feet) sides is shared with the neighbor, who has the same building on their side. (The second floor has a sloped roof with knee walls.)
It has a half-gable roof with a new beaver tail tile covering and two Roto roof windows with blinds.
Regarding the walls: The ground floor has all four sides made of 24 cm (9.5 inch) masonry with older sand-lime bricks, definitely white 12 x 6 cm (4.7 x 2.4 inch) bricks.
The upper floor with the sloped roof, however, is built with reinforced corner pillars of 24 cm (9.5 inch) thickness supporting the roof, while the four walls in between are only 12 cm (4.7 inch) thick.
Now to my question/problem.
Basically, external insulation is not an option due to building constraints.
Is effective internal insulation feasible, and if so, what thickness would be appropriate? (I simply cannot figure out the calculations.)
I received an offer from a company suggesting attaching 80 mm (3.15 inch) calcium silicate boards on the 12 cm (4.7 inch) walls upstairs. Is this reasonable/sufficient?
What I would ideally prefer are Steico wood fiber boards.
If more information is needed, please let me know.
I just want to understand whether this is sensible/feasible.
Thank you very much,
Fabian
I just have a few questions and maybe someone has some answers for me.
So, no rush—I know the building’s condition isn’t ideal.
About the building,
it is a two-story structure measuring 5 x 3 meters (16.4 x 9.8 feet); one of the 5-meter (16.4 feet) sides is shared with the neighbor, who has the same building on their side. (The second floor has a sloped roof with knee walls.)
It has a half-gable roof with a new beaver tail tile covering and two Roto roof windows with blinds.
Regarding the walls: The ground floor has all four sides made of 24 cm (9.5 inch) masonry with older sand-lime bricks, definitely white 12 x 6 cm (4.7 x 2.4 inch) bricks.
The upper floor with the sloped roof, however, is built with reinforced corner pillars of 24 cm (9.5 inch) thickness supporting the roof, while the four walls in between are only 12 cm (4.7 inch) thick.
Now to my question/problem.
Basically, external insulation is not an option due to building constraints.
Is effective internal insulation feasible, and if so, what thickness would be appropriate? (I simply cannot figure out the calculations.)
I received an offer from a company suggesting attaching 80 mm (3.15 inch) calcium silicate boards on the 12 cm (4.7 inch) walls upstairs. Is this reasonable/sufficient?
What I would ideally prefer are Steico wood fiber boards.
If more information is needed, please let me know.
I just want to understand whether this is sensible/feasible.
Thank you very much,
Fabian
M
Messerjoe6 Jan 2024 17:54Fabian2024 schrieb:
Did you have a favorite in your theory?Yes, the wood fiber and clay plaster option.
The mineral-based materials are also very good insulators, but I don’t like the idea that during a later demolition or renovation, they would end up as landfill waste and cannot be recycled. Even if I’m already underground by then.
There are also wood fiber interior insulation boards that come pre-coated with clay plaster. These just need to be glued to the wall and can then be filled and painted right away.