jpinthehouse Posted October 30, 2017 Posted October 30, 2017 Hi Is it better to have 600 mm centres, or 400mm 600mm , more insulation, less thermal bridging, less timber 400mm, less insulation,more thermal bridging, stronger structure Thanks John
Redoctober Posted October 30, 2017 Posted October 30, 2017 I think the industry standard is 600mm. Possibly for the reasons you mentioned above. The only advantage you listed above for 400mm is a stronger structure but I would argue it isn't necessary - otherwise the SE and similar interested parties would advocate 400mm. PW.
jpinthehouse Posted October 30, 2017 Author Posted October 30, 2017 (edited) Hi 140x50mm Edited October 30, 2017 by Construction Channel because I can :)
JamesP Posted October 30, 2017 Posted October 30, 2017 (edited) Ours is 600mm for walls and roof, 400mm for first floor. Internal walls 400mm. OSB will be fixed to walls and roof on the inside. Edited October 31, 2017 by JamesP Detail. 1
Jeremy Harris Posted October 30, 2017 Posted October 30, 2017 Ours is 400mm everywhere, walls, joists and rafters.
MikeSharp01 Posted October 30, 2017 Posted October 30, 2017 3 minutes ago, JSHarris said: Ours is 400mm everywhere, walls, joists and rafters There is an argument for 400 centres based on achieving flatter walls with plasterboard but it must be marginal. I guess you need 400mm to meet the structural requirements around the larson truss system. There is also another argument based around the sizes of boards because OSB normally comes in 8 x 4 (2440 x 1220) while plaster board comes in at 2400 x 1200 which seems mad as to use the larger OSB boards you need, or it is implied that you need to, move out to 610mm centres!
Nickfromwales Posted October 30, 2017 Posted October 30, 2017 400mm for bathrooms and kitchens for cabinets etc and tile weight per m2 Don't forget that over a certain kg/m2 you need to ply then PB then tile. 400mm centres if it were me, 600mm is ok for living spaces and bedrooms, hallways etc but utility / kitchen / bathrooms etc should be 400mm.
dpmiller Posted October 30, 2017 Posted October 30, 2017 All but the very cheapest TF quotes I've got have been for 400 centres inside and out.
ProDave Posted October 30, 2017 Posted October 30, 2017 Interesting. Almost without exception every TF house I see (usually the ones I wire) are 600mm spacing, my own included. Though (don't ask me why) I have very awkward 450mm spaced rafters. I have built all my internal stud walls to 400 spacing. 400mm spaced JJI joists downstairs. 600mm spaced posi joists upstairs
Declan52 Posted October 30, 2017 Posted October 30, 2017 All stud work, joists and truss I have ever seen in NI have always been 400mm centres.
Jeremy Harris Posted October 30, 2017 Posted October 30, 2017 (edited) 400mm spacing does make for a very stiff and solid structure. I'm really impressed with the lack of any detectable bounce in our floor, which is Posijoists on 400mm centres. Edited October 30, 2017 by JSHarris 1
Nickfromwales Posted October 30, 2017 Posted October 30, 2017 You can do 600 in kitchens and bathrooms etc but you'll have to ply or OSB them as tiling over plasterboard at 600 centres holds very little weight. Even worse when the moisture from the adhesive softens the PB.
Construction Channel Posted October 30, 2017 Posted October 30, 2017 400 everywhere for me, well mine is actually 16" because of the OSB issue Mike mentioned earlier.
jamiehamy Posted October 30, 2017 Posted October 30, 2017 49 minutes ago, Nickfromwales said: You can do 600 in kitchens and bathrooms etc but you'll have to ply or OSB them as tiling over plasterboard at 600 centres holds very little weight. Even worse when the moisture from the adhesive softens the PB. Hmm mm... I'm almost too late but not quite. 9mm ply or thicker?
Oz07 Posted October 30, 2017 Posted October 30, 2017 Is there no metric sheets of OSB made specifically for this issue? Or can t&g sheeting be bought which works with 400/600?
Construction Channel Posted October 30, 2017 Posted October 30, 2017 its probably possible to order it in, but i have never found any on the shelf.
jamiehamy Posted October 30, 2017 Posted October 30, 2017 16 minutes ago, Oz07 said: Is there no metric sheets of OSB made specifically for this issue? Or can t&g sheeting be bought which works with 400/600? Can def get TG osb metric. We got 2400x600 for the roof after the farce of being supplied 2440x1220 for the upper roof.
Oz07 Posted October 30, 2017 Posted October 30, 2017 Thought there would be a solution! how was your racking done @ProDave? Studs set to imperial or metric boards sourced?
Construction Channel Posted October 30, 2017 Posted October 30, 2017 9 minutes ago, Oz07 said: Thought there would be a solution! For us the standard solution is a skill saw
MikeSharp01 Posted October 30, 2017 Posted October 30, 2017 3 hours ago, jamiehamy said: Hmm mm... I'm almost too late but not quite. 9mm ply or thicker? Na..... just use 12mm Hardie Backer board - you could probably get away with 1200mm centres, no wonder you cannot buy it in the 1200 x 2400 sheets only smaller ones (1200 x 800) as the weight would be unmanageable on anything bigger!
MikeSharp01 Posted October 30, 2017 Posted October 30, 2017 1 hour ago, jamiehamy said: Can def get TG osb metric. We got 2400x600 for the roof after the farce of being supplied 2440x1220 for the upper roof. You can get both T&G and square edge at 1200 x 2400 (See here for details) 1
Construction Channel Posted October 30, 2017 Posted October 30, 2017 got to love that opening picture. Every bit of PPE they could possibly wear except goggles and ear protection, and the only recommended PPE for the paslode that is also in the picture would be.......... good picture though, very dramatic,,,,,,,
ProDave Posted October 30, 2017 Posted October 30, 2017 1 hour ago, Oz07 said: Thought there would be a solution! how was your racking done @ProDave? Studs set to imperial or metric boards sourced? I will have to confirm with a tape measure, but I am 99.9999% certain the OSB we get here (made by Norboard next to Inverness airport) is 2400 by 1200 metric size. It certainly fits 600mm centre studs, and then when battened metric plasterboard fits perfectly. Reading between the lines, some of you are only able to buy 1220 by 2440 imperial OSB?
Construction Channel Posted October 30, 2017 Posted October 30, 2017 3 minutes ago, ProDave said: Reading between the lines, some of you are only able to buy 1220 by 2440 imperial OSB? yes, and it's infuriating.
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