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Looking for some input to this subject. I plan to lay OSB panels over the suspended garage beams. they were made for our project and installed professionally. the area was always intended to be a large room rather than storage ( yes I know about the potential use and regulations etc). So the engineering loafibg calculation was 190kg/m2 ( this is an overengineereed floor with laminate main beams etc) and reinforced brickwork in the vertical and horizontal lines. So my questions please: 1. What is the difference between OSB 4 and OSB 3? I'm planning at least 22mm but probably thicker- I need to check my joist spacing but I'm not a home. 2. I see that there should be a 3mm gap between panels but many makes have this built in on the t&g edges so the gaps are for the ends. 3. What space should be left at the perimeter where it meets the brickwork? This room will be insulated below and the walls/ceilings. So what considerations are needed at the edges? Acoustic/ damproof plasterboard will be suspended below and filled with loose fill wood fibre insulation - no rockwool/ kingspan products on the house due to potential future health issues. The OSB boards will be glued and then screwed down as per makers instructions Any thoughts anybody? With consideration to the warm room sitting over a cool garage. airflow and damp being on my mind
