ᐅ Insulating a slanted wall / cavity in front of or behind insulation
Created on: 5 Apr 2021 16:41
S
stephax
Hello,
I am currently renovating our garden shed (wooden structure), which we recently acquired and had to completely gut first.
Now I have a question about insulation, as I have the following fundamental problem:
Unfortunately, the exterior walls are completely uneven—both in the floor plan lines and vertically. For the interior cladding, I need to build a furring strip framework that is straight. However, this will result in gaps between the interior wall cladding and the exterior wall varying from 8 cm to 22 cm (3 inches to 9 inches).
My question: Is it better to install the insulation directly against the exterior wall or directly against the interior wall cladding? In other words, where is it smarter to leave the cavity due to the varying distance? Most walls and ceilings only allow for insulation up to 8 cm (3 inches) thick. This would mean that, with the uneven walls, there could be up to 14 cm (5 ½ inches) of air between the insulation and the interior or exterior wall...
If necessary, here is some additional information:
The exterior walls are constructed from inside to outside as follows: wooden battens, expanded polystyrene (EPS), roofing felt, tongue-and-groove cladding. Inside, I plan to install a vapor retarder over the insulation and then cover the wall with 12 mm (½ inch) plywood panels.
Thank you for your suggestions and recommendations.
I am currently renovating our garden shed (wooden structure), which we recently acquired and had to completely gut first.
Now I have a question about insulation, as I have the following fundamental problem:
Unfortunately, the exterior walls are completely uneven—both in the floor plan lines and vertically. For the interior cladding, I need to build a furring strip framework that is straight. However, this will result in gaps between the interior wall cladding and the exterior wall varying from 8 cm to 22 cm (3 inches to 9 inches).
My question: Is it better to install the insulation directly against the exterior wall or directly against the interior wall cladding? In other words, where is it smarter to leave the cavity due to the varying distance? Most walls and ceilings only allow for insulation up to 8 cm (3 inches) thick. This would mean that, with the uneven walls, there could be up to 14 cm (5 ½ inches) of air between the insulation and the interior or exterior wall...
If necessary, here is some additional information:
The exterior walls are constructed from inside to outside as follows: wooden battens, expanded polystyrene (EPS), roofing felt, tongue-and-groove cladding. Inside, I plan to install a vapor retarder over the insulation and then cover the wall with 12 mm (½ inch) plywood panels.
Thank you for your suggestions and recommendations.
Ah, okay, that simplifies the insulation significantly. I would say you can choose from the full range, and in my opinion, it doesn’t really matter if the insulation is installed with varying thicknesses.
When it comes to keeping heat out, as others have already mentioned, mass with a high heat storage capacity has a clear advantage. If it’s a garden shed, however, most of the heat might enter through single-glazed/unshaded windows or the roof. That said, you might also want to consider what is economically worthwhile for a garden shed. Plywood could be an option, and cement-bonded wood-based panels (particleboard), also known as Heraklith or Sauerkraut board, would be my first thought—possibly used in double layers. This applies if the insulation is meant to be installed on the inside. On the outside, of course, you have many more options 🙂
As mentioned, this is just an amateur opinion.
When it comes to keeping heat out, as others have already mentioned, mass with a high heat storage capacity has a clear advantage. If it’s a garden shed, however, most of the heat might enter through single-glazed/unshaded windows or the roof. That said, you might also want to consider what is economically worthwhile for a garden shed. Plywood could be an option, and cement-bonded wood-based panels (particleboard), also known as Heraklith or Sauerkraut board, would be my first thought—possibly used in double layers. This applies if the insulation is meant to be installed on the inside. On the outside, of course, you have many more options 🙂
As mentioned, this is just an amateur opinion.
Thank you for your opinion, @South. The windows are triple-glazed, and the roof will also be insulated. Since multiplex plywood is currently unavailable due to the EU’s anti-dumping measures against Russia, we have to switch to pine plywood panels. For aesthetic reasons, we wanted wood panels as cladding, so no particleboard or drywall with plaster or wallpaper.
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