tonyshouse Posted May 22, 2016 Share Posted May 22, 2016 These are remarkable! 8x4 sheets come in a variety of sizes and thicknesses eg 1200 X 2438 of 12.5mm plasterboard, can be 1800, 2400, 2500,2700, 2900, 3000 even 3600 never 1220 wide Whereas plywood comes 1220 wide and 2440 long strangely nothing comes in centimetre sizes, only meters or millimetres which I am happy about. It is about time inches went out the window. Link to comment Share on other sites More sharing options...
ProDave Posted May 22, 2016 Share Posted May 22, 2016 Someone raised an interesting conundrum recently. If you are lining a wall with OSB for racking strength of a timber frame, you are supposed to leave a 3mm gap. So shouldn't sheets of OSB be 1197mm wide not 1200. Otherwise at the end of a long run your joints are falling off the 600mm spaced studs. Link to comment Share on other sites More sharing options...
Jeremy Harris Posted May 22, 2016 Share Posted May 22, 2016 I couldn't agree more, Tony. I think the thing that annoys me is ordering a load of 2400 x 1200 sheets, because you want them to fit on 400 centres, only to have the BM deliver 2440 x 1220................. 1 Link to comment Share on other sites More sharing options...
Construction Channel Posted May 22, 2016 Share Posted May 22, 2016 OSB is the worst culprit for this, plasterboard has gone metric and so has most other sheeting like MDF or hard faced ply. the stockist must be to blame, if they stopped ordering 8x4s the manufacturer might take the hint...? Link to comment Share on other sites More sharing options...
Stones Posted May 22, 2016 Share Posted May 22, 2016 I've often wondered why sheets are made 1220 when the standard centre is 600 (or 400). It's as if the manufacturers want you to buy more than you need...although more than likely Ed's post contains the real answer as to why the manufacture the size they do. Link to comment Share on other sites More sharing options...
Construction Channel Posted May 22, 2016 Share Posted May 22, 2016 it didn't, but they're working imperial. at 16" or 2' centres PITA really as I think its only the Americans that still build in imperial I built my entire barn at 16" centres because of this. I decided plasterboard was quicker to cut than OSB and the decision was made. all because the local BM stocks 8x4 sheets of OSB! Link to comment Share on other sites More sharing options...
Guest Alphonsox Posted May 22, 2016 Share Posted May 22, 2016 24 minutes ago, ProDave said: If you are lining a wall with OSB for racking strength of a timber frame, you are supposed to leave a 3mm gap. Didn't know this - Is this some form of expansion gap ? Link to comment Share on other sites More sharing options...
Crofter Posted May 22, 2016 Share Posted May 22, 2016 The 3mm gap is actually printed on the boards. I found, though, that the OSB was slightly undersized and it all worked out just fine. So don't use the OSB as a template to build the wall- use a tape measure! Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 22, 2016 Share Posted May 22, 2016 15 minutes ago, Alphonsox said: Didn't know this - Is this some form of expansion gap ? This was something I read on EB. Meant to ask, but never got around to it. So I'm watching this one too. Link to comment Share on other sites More sharing options...
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