SBMS Posted February 15 Posted February 15 Looking at specifying some of our floor posijoists to be 400mm to minimise deflection. However we need to use eger protect or caberdeck as floor will be exposed until watertight. Most flooring sheets are 2400x600mm. However does this work for 400mm spaced floor joists?
ProDave Posted February 15 Posted February 15 Yes it does. you put the sheets perpendicular to the joists and one sheet spans between 6 joists.
Russell griffiths Posted February 15 Posted February 15 You lay the sheets across the joists not with them.
SBMS Posted February 15 Author Posted February 15 Thanks both. Thought that’d be the case but wanted to check
saveasteading Posted February 15 Posted February 15 On 15/02/2025 at 11:39, SBMS said: However does this work for 400mm spaced floor joists? Expand It is likely that there is a lot else you don't know. Keep asking. What is the project?
Russell griffiths Posted February 15 Posted February 15 Some manufacturers say you don’t need to land the end of a sheet on a joist, as long as you stagger the joins. look on all the fixings instructions for different makes.
SBMS Posted February 15 Author Posted February 15 (edited) On 15/02/2025 at 11:49, saveasteading said: It is likely that there is a lot else you don't know. Keep asking. What is the project? Expand Thanks @saveasteading I have been asking for past 6 months on here. It’s our second self build so learned a lot on the first one. Like bouncy floors because they werent designed to minimise deflection. Not best airtightness etc which in trying to remediate. Got the builder doing a Tony tray for example around the joists. Posi rafter roof with blown cellulose instead of attic trusses with PIR. Architect designed cold ventilated flat roof for a portion of the build. This forum had me switch out for a warm roof.. Learning a huge amount on here. There is definitely a lot that I don’t know! Edited February 15 by SBMS
saveasteading Posted February 15 Posted February 15 Be aware that a 2.4m x 1.2m board may be shorthand for an annoyingly longer and wider actual size. You don't want to be cutting ends off. 1
Canski Posted February 15 Posted February 15 Egger protect is what I used. They claim you can tile directly to it which is what I did without any problems. 1
Chanmenie Posted February 15 Posted February 15 On 15/02/2025 at 11:48, SBMS said: Thanks both. Thought that’d be the case but wanted to check Expand P4 Glue and screw then tape the joints with gaffa tape if it’s exposed
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