Substrate Raising

[Ajax123]

You can lay it unbonded so put a polythene slip membrane over the sand cement and then pour minimum 15mm of it on top.

Sorry. I misread your your question....

 

[Rizzle from the Portizzle]

why has such an easy job to do. at low cost .become a high cost job

 

[Rizzle from the Portizzle]

ok here you go sub the job out to tilers who know how to fix in wet sand and cement should be no problem for them this will save you over £41 m2 in levelers decouplers adhesive labour before you lay a tile sit back watch how it should be done and make a few grand and save the same for your client

 

[Dan]

Because there's a woman involved who's changed her mind, again. Haha

why has such an easy job to do. at low cost .become a high cost job

 

[Just Rizzle]

forgott to ask what type of sub straight is it?
think every one is assuming its cement based or is it anhydrite the ufh is layed in?

 

[Ajax123]

At 100mm I'm hoping its sand cement. Not a very efficient way to use underfloor heating but still pretty common.

 

[Ajax123]

ok here you go sub the job out to tilers who know how to fix in wet sand and cement should be no problem for them this will save you over £41 m2 in levelers decouplers adhesive labour before you lay a tile sit back watch how it should be done and make a few grand and save the same for your client

But he's only got 25mm to play with. For a cement sand bedding I would expect around 40mm.

 

[Ajax123]

Ok widler I've worked out a rough price for 100 m2 of ts15 at 15mm and I reckon you'd have quite a lot of change out of £1500. So cheaper than levelling compound. That would include materials, labour and pump.

 

[Just Rizzle]

you could stick down ditra mating to decouple the floor and lay a 25mm sand and cement bed on top of mat total material cost approx.£1000 PAY YOU SELF EXTRA 500QUID your quids in plus floor usable in 2days after laying

 

[Ajax123]

you could stick down ditra mating to decouple the floor and lay a 25mm sand and cement bed on top of mat total material cost approx.£1000 PAY YOU SELF EXTRA 500QUID your quids in plus floor usable in 2days after laying

The standard for tiling calls for sand cement beds to be laid bonded to a fully prepared slab which has been mechanically abraded so there goes the £500 saving. It will cost at least that to hire a sander or shot blast machine. It then says that the cement sand bed should be bonded using a cement slurry with a polymer dispersion primer e.g. acrylic primer.... to be fair it does actually say the bed should be 20mm deep and not 40mm as I had thought. If you stick down ditra...that's an extra 6mm with the mat and the addy. That only leave you 19mm for bedding. Ditra is designed as an uncoupling membrane. It wont offer any protection from the sand cement bed curling or shrinking which at 19mm I would suggest it would do both quite liberally.