jayc89 Posted October 17, 2023 Share Posted October 17, 2023 Wardrobe/ensuite area. Posi joists are in place and I was planning on glueing and screwing 22mm P5 (Caberdek) boards to it. I want to lay an UFH mat and tile it, and have read that P5 isn't great for that. If I shouldn't use the P5 boards, what should I use instead; 22mm ply T&G? Link to comment Share on other sites More sharing options...
nod Posted October 17, 2023 Share Posted October 17, 2023 It makes little difference Link to comment Share on other sites More sharing options...
jayc89 Posted October 17, 2023 Author Share Posted October 17, 2023 9 minutes ago, nod said: It makes little difference I'd much prefer to use P5 as I already have the stuff, but I thought there were concerns around adhesive sticking to the chipboard? What would a typical build up look like if tiling onto caberdek? SBR primer, durabase/ditra, heating mat, tiles? Link to comment Share on other sites More sharing options...
jayc89 Posted October 17, 2023 Author Share Posted October 17, 2023 Reading through a few tiling forum pages, it seems like this might be typically used; - p5 deck - SBR primer - heating mat - SLC to cover the mat (approx 3mm) - decoupling membrane - tiles Does that sound sensible? Whilst the joists have been spec'd for less than 7mm deflection (4m span), I'm worried the SLC might be too brittle. Would a renovation screed like Mapei's 3240 be more suitable? Link to comment Share on other sites More sharing options...
jayc89 Posted October 18, 2023 Author Share Posted October 18, 2023 Any words of wisdom before I go down this route? @Nickfromwales @nod? Link to comment Share on other sites More sharing options...
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