ᐅ Which basecoat board should be used when insulation is not a factor?
Created on: 23 Apr 2019 22:19
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Changeling
For aesthetic reasons and weather protection, I want to plaster a shed made of OSB boards in the color of the house. Since it is just a shed, insulation does not matter at all, but apparently you cannot plaster directly onto OSB, so a plaster base board is required underneath.
Can I simply attach 2cm (0.8 inch) polystyrene panels from the hardware store, or does it have to be something special? At the hardware store with the two “o”s in the middle, for example, the following options are available:
Can I simply attach 2cm (0.8 inch) polystyrene panels from the hardware store, or does it have to be something special? At the hardware store with the two “o”s in the middle, for example, the following options are available:
- sw*sspor multipurpose insulation board EPS DEO 100 x 50 x 2 cm (39 x 20 x 0.8 inches), €1.10
- sw*sspor multipurpose insulation board EPS WI/DI 100 x 50 x 2 cm (39 x 20 x 0.8 inches), €0.90
- What is the difference between DEO, WI/DI, ... and what thickness should I choose?
- Should I fix it with polystyrene adhesive, or screw it on, or ...?
I just read this:
Basically, everything was done correctly. The difference between DEO and WI/DI lies in the compressive strength of the insulation boards.
DEO = Interior insulation under screed without soundproofing requirements. Usually, compressive strength is around 100 kPa at 10% compression.
WI/DI = Interior wall or ceiling insulation, where compressive strength is lower, I believe about 50 kPa at 10%.
For exterior walls of the shed under plaster, you actually need boards approved for WAP = wall exterior under plaster. Most EPS boards, however, are only approved for WAB = wall exterior under cladding, which is sufficient for external thermal insulation composite systems (ETICS) or for plastering above the base course.
A higher compressive strength is required in the base course area because impacts occur more often there. For this purpose, the "base insulation boards" you use are generally suitable. They are the same as the other EPS boards but with higher compressive strength and, if applicable, approval for insulation against soil moisture (PW), assuming water absorption has been tested and is not too high.
So as long as you used the somewhat firmer DEO boards for insulation above the base course, everything is fine. Otherwise, it is better to be cautious with the wall.
Basically, everything was done correctly. The difference between DEO and WI/DI lies in the compressive strength of the insulation boards.
DEO = Interior insulation under screed without soundproofing requirements. Usually, compressive strength is around 100 kPa at 10% compression.
WI/DI = Interior wall or ceiling insulation, where compressive strength is lower, I believe about 50 kPa at 10%.
For exterior walls of the shed under plaster, you actually need boards approved for WAP = wall exterior under plaster. Most EPS boards, however, are only approved for WAB = wall exterior under cladding, which is sufficient for external thermal insulation composite systems (ETICS) or for plastering above the base course.
A higher compressive strength is required in the base course area because impacts occur more often there. For this purpose, the "base insulation boards" you use are generally suitable. They are the same as the other EPS boards but with higher compressive strength and, if applicable, approval for insulation against soil moisture (PW), assuming water absorption has been tested and is not too high.
So as long as you used the somewhat firmer DEO boards for insulation above the base course, everything is fine. Otherwise, it is better to be cautious with the wall.
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Changeling24 Oct 2019 06:35Thank you very much for the clarification! Very helpful and informative.
I will be more cautious with the wall, then.
Unfortunately, the building materials supplier I trust only had WI/DI boards available in 3cm thickness (1¼ inches).
The shed does not rest directly on the ground but has about 2cm (¾ inch) of air gap to the paving. I installed a sheet metal piece bent at a 120° angle there:
And at the end, I applied a professional plaster finish, including reinforcement mesh, base coat, then regular plaster on the upper part and base plaster on the lower section.
I will be more cautious with the wall, then.
Unfortunately, the building materials supplier I trust only had WI/DI boards available in 3cm thickness (1¼ inches).
The shed does not rest directly on the ground but has about 2cm (¾ inch) of air gap to the paving. I installed a sheet metal piece bent at a 120° angle there:
And at the end, I applied a professional plaster finish, including reinforcement mesh, base coat, then regular plaster on the upper part and base plaster on the lower section.
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