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Tile Adhesive, Cement (Tile Mud)
Tile Adhesive / Grout Advice
Self Levelling Compound Has Hairline Cracks After Walking Over It. 20mm Insulation Boards Underneath - Too Much Flex?
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[QUOTE="Deleted member 57709, post: 980290"] Hi everyone, Hope to get some help and advice please. I have laid down 8mm of self levelling compound on a concrete floor after priming it so it was a good level to work off (I also included an 8mm expansion joint around the perimeter) (Conservatory is 15 years old and area of 14 m2). I then primed the SLC one week later and left till next day when I used a recommended rapid set flexible tile adhesive (Trade S1) to stick down the cement faced insualtion boards (20mm thick boards which I primed both faces and also sides before fixing into place). I then primed the top of the boards again 2 days later. I then stuck down fibreglass tape on joints using the same tile adhesive. I then primed again once all was dry (again this was two days later). I then poured Mapiei Renovation SLC (3240) onto boards between 5-10mm depth in places (mixed as per instructions 4.25-4.5L per 25kg bag with paddle mixer). I used a trowel to move the SLC around and spiked roller to remove as much air as possible. Left the floor alone for a few days to be on the safe side and then I walked on it. All seemed ok and then next day whilst walking on it again I noticed some long and also some short hairline cracks had appeared over the whole floor, these were not in straight lines and were not coming from one particular spot. As the day went on whilst I was working in the room I noticed that more of these hairline cracks had appeared obviously by me walking on the floor. On close inspection, I tapped the SLC with a screwdriver handle in different places and there is a hollow sound which I know may mean it has blown but I dont think it has in my opinion and put it down to the 20mm insulation board just below it which is making this type of sound. I have drilled quite a few holes in various places around the floor area to check if I could see if there was any gap between the insulation board and SLC but I found none. I got a screwdrive and taped it with a hammer around one of the drilled holes and found that the SLC was very hard and brittle and I'm sure I heard a cracking sound coming from somewhere whilst doing this but not sure whether is was something else I heard as it does echo a lot in the room with it being empty. My plan is to prime the floor again and pour another 5mm - 6mm SLC on top to get a perfect level and then to stick down Ditra Heat Duo Uncoupling Membrane so I can install electric underfloor heating and tiles on top. The tiles that I will be putting down are 610 x 610mm x 9mm ceramic porcelain mix. Any thoughts whether its ok for me to proceed as per my plan or are these hairline cracks a nightmare and means I would need to rip everything up and start again? If I need to rip everything up then your opinion what has caused these hairline cracks to appear? is it the compression from when I have walked over the floor etc? Let me know and thanks in advance for any help and advice. Oh by the way I used Mapie G primer for the SLC and used Trade primer for the Trade tile adhesive so keeping same brands together. Regards, Gary. [/QUOTE]
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Tile Adhesive, Cement (Tile Mud)
Tile Adhesive / Grout Advice
Self Levelling Compound Has Hairline Cracks After Walking Over It. 20mm Insulation Boards Underneath - Too Much Flex?
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