ᐅ Construction of a wooden beam floor for a two-story single-family house with a pitched roof.
Created on: 25 Dec 2017 16:34
P
Paulus16
Hello,
We recently celebrated the topping-out ceremony for our two-story single-family house about 10 days ago.
However, I have some concerns regarding the construction of the wooden beam ceiling:
- The carpenter installed a walkable floor directly on the beams across the entire area, using OSB 3 boards.
- The boards are attached directly to the beams, with no battens in between.
Full insulation between the beams is planned later during the interior finishing, along with a vapor barrier, battens, and drywall. The attic itself will not be heated. The roof slopes will not be insulated.
I am worried that, due to the lack of ventilation and the vapor-tight OSB boards installed directly on top of the insulation, condensation and mold could develop. Is this design faulty, does it comply with building regulations (building permit/planning permission), or am I overreacting? What do you think?
We recently celebrated the topping-out ceremony for our two-story single-family house about 10 days ago.
However, I have some concerns regarding the construction of the wooden beam ceiling:
- The carpenter installed a walkable floor directly on the beams across the entire area, using OSB 3 boards.
- The boards are attached directly to the beams, with no battens in between.
Full insulation between the beams is planned later during the interior finishing, along with a vapor barrier, battens, and drywall. The attic itself will not be heated. The roof slopes will not be insulated.
I am worried that, due to the lack of ventilation and the vapor-tight OSB boards installed directly on top of the insulation, condensation and mold could develop. Is this design faulty, does it comply with building regulations (building permit/planning permission), or am I overreacting? What do you think?
Hello and Happy New Year!
Hello 11ant, could you please explain this sentence to me? How do you ensure the necessary air circulation?
11ant schrieb:
Without circulation, you would have the exact breeding ground for the condensation you are worried about.
Hello 11ant, could you please explain this sentence to me? How do you ensure the necessary air circulation?
Paulus16 schrieb:
How do you ensure the necessary air circulation then? You don’t, not at that point. Without it, you end up with exactly what you want to avoid: the concept of an air gap does not logically transfer from a vertical to a horizontal position.
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Thanks, 11ant. Let me summarize to see if I understood correctly:
Did I understand everything correctly, or did I miss something?
- Installing wooden boards directly on the wooden beams is correct; this then results in full insulation.
- Using tongue-and-groove boards instead of OSB panels on the wooden beams and insulation is a more fault-tolerant construction because it is more vapor-permeable, allowing any condensation to evaporate more easily.
- The key factor is a functional vapor retarder on the warm, inner side.
Did I understand everything correctly, or did I miss something?