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Best practice for a large (120sqm) tiling job
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[QUOTE="Qwerty89, post: 988554, member: 60781"] Hi all I’m so glad to have stumbled upon this forum, which seems to be a treasure trove of advice. I wanted to put my own situation up, and ask for some advice from the specialists on here! I’ve added the details, as hopefully this helps others too… [B][U]Situation [/U][/B] [LIST] [*]Ground floor renovation job [*]We have had wet underfloor heating pipes installed, and air pressure tested [*]We have 7.5mm of a new sand and cement fast drying screed (Tarmac Truscreed C30) installed, and it has been down for 2 weeks [*]There are expansion gaps around most of the perimeter, but there are no control of movement joints in the screed (yet) [*]One of the rooms is quite large (60sqm) so I think the builder needs to make movement joints in the screed to split it into two bays (25 and 35 sqm) [*]The screed manufacturer’s instructions say it should be dry enough to accept final floor finish in 15-21 days (5-7 days per 2.5mm of screed) [*]We plan to install porcelain tiles throughout the ground floor - the total are is around 100 sqm so I’m very keen to ensure it’s done properly [*]The tiles are 10mm thick, and 20cm x 120cm wood effect style tiles. [*]The builder tells me he usually waits 30 days after screed installation, then installs tiles with flexible adhesive, and then commissions UFH after. He says he’s never had any problems with cracking. [*]After reading this forum and other websites, it seems to me that the correct order should be: [LIST] [*]Install movement joints [*]Wait until screed is dry (hygrometer test, 75% RH) [*]THEN commission underfloor heating over 7 days (5 degree increments, 3 days at full heat, and then cool down) [*]THEN repair any cracks that emerge in the screed [*]THEN install tiles [*]Wait 14 days for adhesive and grout to dry without turning UFH on again [/LIST] [/LIST] [B][U]My questions:[/U][/B] [LIST=1] [*]Is the order of events above correct? [*]Do we really need decoupling matts? There is mixed advice online, and this would also seem to add another 10mm at least to the floor height (which we don’t have!), as well as a few thousand pounds too. [*]How thick does the adhesive need to be? Builder says 8mm adhesive + 10mm tile = 18mm build up. If we need to install decoupling matts, can we reduce the build up somehow? [*]When putting movement joints in the screed and tiles, how wide do these need to be? Ideally I want something 3mm wide only with flexible silicone so it is indistinguishable from normal grout lines, but not sure if this is enough, or better to buy movement strips. [*]Would it be okay to install the kitchen units + island on top of these tiles (the UFH pipes won’t be underneath) or should we tile around the kitchen? [*]Is there anything else I’ve missed? [/LIST] [/QUOTE]
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Best practice for a large (120sqm) tiling job
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