Olf Posted July 31, 2022 Share Posted July 31, 2022 I've drawn the layout and calculated number of boards assuming that because they are tongue & groove (and boneded with foaming glue) it does not matter where they meet. However reading now advanced fitting guide it states: All short end joints should always fall on the centre of a secured joist including perimeter edges. Is that the case in practice? Of course in my refurb joist spacing appears to be random, if I was to follow that rule, instead of 3 boards per row (7m internal width, 3x2.4m boards should do it) I probably need another one for each row, if the previous 3 are chopped to match the joists. And is square edge sitting on the joist more rigid than suspended glued tongue & groove? Link to comment Share on other sites More sharing options...
Jonny Posted July 31, 2022 Share Posted July 31, 2022 In practice, the boards are generally just laid wherever they fall. We’ve never had issues with movement on an unsupported end as long as glued well. Any squeaks/noises are generally down to not enough glue/nail missing joists. Having said that, most of the joists we work on are 400cc. Link to comment Share on other sites More sharing options...
joe90 Posted July 31, 2022 Share Posted July 31, 2022 I have never done that with short ends, with proper glue it becomes one piece, never had a problem and no squeaks! 1 Link to comment Share on other sites More sharing options...
Moonshine Posted July 31, 2022 Share Posted July 31, 2022 Glue it and it should be fine, if you are worried about the joint put a couple of noggins in to support the joint 1 Link to comment Share on other sites More sharing options...
Olf Posted August 1, 2022 Author Share Posted August 1, 2022 Sounds like a plan: on landing (only 2 boards side by side) I'll add noggins under the joints. In the rooms I will just go with the flow: with many neighbouring boards, each shifted by half width, they will hold the short ends from either side. Link to comment Share on other sites More sharing options...
joe90 Posted August 1, 2022 Share Posted August 1, 2022 Recently I replaced the whole ground floor of a bungalow (woodworm) and only supported with noggins short ends where a square cut was needed (doorways etc). Link to comment Share on other sites More sharing options...
DragsterDriver Posted August 13, 2022 Share Posted August 13, 2022 Building regs are joined on a joist or supported by a noggin 1 Link to comment Share on other sites More sharing options...
Olf Posted August 16, 2022 Author Share Posted August 16, 2022 Though I could not find that in builing regs, there is actually a nice chapter in NHBC standards. It also mentions 'long edges at room perimeters should be fully supported on joists or noggings' - oh well, I've got 2 more rooms to improve Though in my defence the existing floor (T&G planks) did not have that feature. Link to comment Share on other sites More sharing options...
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