Underfloor heating has been run up and down over 6 weeks, mapei tradeplan latex has been installed 2 months. F46 used and primers. Coverage on plank good and adhesive on floor still live. Kitchen and hallway, no kickboards on in kitchen and planks are firmly stuck at that point and over the whole floor APART from around the perimeter where skirtings are but only by 2 to 3" now I know for a fact that customer built the property and it's on block/beam floor and he has admitted i'll tell you later. SO WHAT DO YOU THINK has gone wrong? sorry didn't take floor temp as house lived in and heating had just been turned off.
imprint of adhesive throughout on the planks, once the adhesive had been warmed it stuck to the floor well
Trade plan & f46 is a bad combo IMO ! F46 doesn't like any hint of moisture & tradeplan doesn't like to dry ? Is it happening all over or just certain places ?
just where the skirts are, stuck everywhere else even where the plinths would be, the planks that run in length came up and the planks that were on the ends not stuck by 2 to 3" and very difficult to lift passed that point
I've had that happen a couple of times with new builds. I think after the construction the heating was cranked up drying out the materials too much and shrinking them. When the heating was reduced to a reasonable level the materials expanded again putting pressure on the outer planks and causing them to pop.
Difficult one without seeing the job myself. But my first guess would be the underfloor heating has been run to high. The concrete slab itself has expanded (only needs to move a mm) and forced the lvt tight against the skirts. The headers have popped as i would presume are running down the length of the concrete floor so the movement in concrete will be more this way. PS has low pull strength so it would pop the headers. I would also expect to see minor gapping on headers across the whole floor but tight around edges. However if the heating has been dropped down to lower levels the main field would of gone back to normal leaving popped headers on the perimeter planks? I would be looking for cracking of caulking around tops of skirts, if none then i would possibly rule this theory out and start looking for another reason.
Could the skirting a have expanded/swelled? That's why there's only pressure there making them lift ?
Now, I mentioned at the start it is a self build. on block/beam with underfloor heating. The customer admitted that he did not slurry screed the beams into the block to set the two together
you tell me ?? The bathroom upstairs was prim fixed as requested and antiplas has emulsified and vinyl bubbled, I prefer to stick all over but floor was uneven and would have made it look worse. I peeled it back trimmed and restuck, it's flat again....
