Onoff Posted March 9, 2018 Share Posted March 9, 2018 (edited) Posting this on behalf of a mate: "Lifted up the newer tiles back to the original ones. Gonna just tile over them like what was done before. What would you do for the back corner? Still need to take up the old adhesive but gonna have about a 15mm deep gap where no original tiles were. The washing machine is going there so don’t know if I’ll be able to get away with adding extra adhesive to raise those tiles or should use something else?" I was thinking bring up to level with existing tiles, a decent self levelling "something"? Or a strong SBR laden screed levelled off. How to prep though? Cheers Edited March 9, 2018 by Onoff Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 9, 2018 Share Posted March 9, 2018 2-part self leveller for the deficit. If the old tiles are sound then crack on. If there's any hint of movement then chuck a Ditra mat over it or it's a suicide mission. 1 Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 8 hours ago, Nickfromwales said: 2-part self leveller for the deficit. If the old tiles are sound then crack on. If there's any hint of movement then chuck a Ditra mat over it or it's a suicide mission. Cheers. Any particular make of compound? Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 Any 2-part TBH, Ultra or Ardex. Ardex is expensive so try and find a BM that stocks the Ultra if you can as it's prob half the price and I can't tell them apart once laid. Ultra 2-part. Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 (edited) 11 minutes ago, Nickfromwales said: Any 2-part TBH, Ultra or Ardex. Ardex is expensive so try and find a BM that stocks the Ultra if you can as it's prob half the price and I can't tell them apart once laid. Ultra 2-part. Says only up to 12mm for the Ultra or you have to bulk it out: "Level IT Two can be applied at depths between 2 and 12mm. For deeper sections up to a maximum of 30mm, it is necessary to bulk out with a suitable graded aggregate filler. This can drastically prolong curing times so allowances must be made accordingly". He's worried about the wm going on top. Or just lay to the 12mm max depth and let the tile adhesive take up the rest? (What tile adhesive will be the next question! ) Edited March 10, 2018 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 Would mix No2 not do for this: Mix Design’s 1. Floor Screeding and Screed Repair (min. 6mm) by weight by volume 50kg cement 1 pbv 150kg medium sand 2.5 pbv 10 litres SBR (1:1 SBR:water 9 litres water* (add to consistency Yield approx 0.1m³ 2. Heavy duty floor toppings (min. 12mm) by weight by volume 50kg cement 1 pbv 75kg medium sand 1.25 pbv 75kg 6-3mm grano chips 1.25 pbv 10 litres SBR (1:1 SBR:water 9 litres water* (add to consistency Yield approx 0.1m3 3. Waterproof Renders (min.6mm) by weight by volume 50kg cement 1 pbv 125kg medium sand 2 pbv 10 litres SBR (1:1 SBR:water 9 litres water* (add to consistency Yield approx 0.1m³ 4. Water Resistant Concrete (min.25mm) by weight by volume 50kg cement 1 pbv cement 100kg medium sand 1.5 pbv 100kg 10-5mm pea shingle 1.5 pbv 5 litres SBR (1:3 SBR:water 13 litres water* (add to consistency Yield approx 0.14m³ 5. Bonding Screeds, Plaster, New Concrete to Old by weight by volume 1kg cement 1 pbv cement 1 litre SBR 1 pbv SBR Yield approx 3-4m² per litre 6. Floating Screeds (min. 38mm) by weight by volume 50kg cement 1 pbv 150kg medium sand 2.5 pbv 4.5litres SBR (1:3 SBR:water 13.5 litres water* (add to consistency Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 I prefer to pour something 'pissy' when patching in. A patching screed doesn't creep and key in anywhere near as good without a load of prep and priming etc. £20. Mix - pour - forget. . Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 (edited) 12 minutes ago, Nickfromwales said: I prefer to pour something 'pissy' when patching in. A patching screed doesn't creep and key in anywhere near as good without a load of prep and priming etc. £20. Mix - pour - forget. . So the Ultra will be OK above 12mm without bulking out? Says with this Mapei stuff you can add 20 - 30% sand for thicknesses greater than 10mm: latexplan.pdf Edited March 10, 2018 by Onoff Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 I'd just chuck in clean 6mm chippings. Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 Or a bag of dash if there's one handy. Adding sand dries it out. Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 (edited) 19 minutes ago, Nickfromwales said: Or a bag of dash if there's one handy. Adding sand dries it out. Would a single layer of 10mm pea shingle first work? To bulk it out and have gaps for the compound to run between and key to the existing substrate? All I could find chippings wise was this: https://www.travisperkins.co.uk/Grano-6mm-Dust-Trade-Pack/p/996251 Edited March 10, 2018 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 (edited) 30 minutes ago, Nickfromwales said: Or a bag of dash if there's one handy. Adding sand dries it out. What's "dash"? EDIT: JUST twigged, pebbledash! Same question as before then, how thick a layer in the bottom of the void? And should it be "gappy" to allow the muck to bond to the solid stuff underneath? Ta. Edited March 10, 2018 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 This is easiest for him to get! https://www.wickes.co.uk/Wickes-10mm-Gravel-Pea-Shingle-Major-Bag/p/220128 Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 10mm is a bit big if he's filling 12mm. Depends on how much tile adhesive is going over it afterwards. Link to comment Share on other sites More sharing options...
Onoff Posted March 10, 2018 Author Share Posted March 10, 2018 25 minutes ago, Nickfromwales said: 10mm is a bit big if he's filling 12mm. Depends on how much tile adhesive is going over it afterwards. He reckons he's got 15mm of depth to fill. Dunno where he'd get small bags of 6mm chippings. The TP stuff is 6mm to dust. Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 10, 2018 Share Posted March 10, 2018 No dust ! Ordinary dash should be available in small bags, but if filling 15mm then 10mm chippings should be fine. Link to comment Share on other sites More sharing options...
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