2 Slabs!

[raylincs]

Hi All
I've just been to see a job, where the customer has had an extension built on a 1930's house. A new concrete slab has been laid (4 weeks ago), and joined to the old concrete one. The new has been done to building regs and has insulation under it. the old 1930 I doubt will have any insulation. The area 30ftx20ft open plan kitchen and then a small utility room. No underfloor heating.

The floor levels are way out! I was intending to chip out any mounds, prime with PVA (twice), and use SLC over the whole area, then use flex addy to fit the tiles.

Would you agree or do something else.

Thanks

Ray

 

[beanz]

What are the tiles? You really need an expansion gap between the two slabs.. You might get away with just using Ditra, as the customer will no doubt balk at the idea of an expansion gap, but I'm not 100% sure that would be enough. Be interesting to hear some opinions from the more experienced guys out there.

 

[raylincs]

Thanks for the reply beanz, an expansion gap between the 2 slabs will look strange as the old slab is like a box 6ft box adjoining the new slab. The tiles a 400mm square porcelain

 

[J Sid]

I would be happy to slc the two area's flat the use detra ( other brands not available) . Done this many times over many years, never a problem.

 

[cam_low]

PVA ? no, use an SBR or an acrylic primer !

 

[raylincs]

I was only going to use the PVA to seal the slabs before laying the SLC

 

[J Sid]

Read the slc bag and use what is recommended and mix as per instructions.

 

[Stef]

DO NOT USE PVA!!

I take it your not a tiler by trade??

 

[White Room]

DO NOT USE PVA!!

I take it your not a tiler by trade??

He signed up 6 years ago Rob...

 

[Stef]

He signed up 6 years ago Rob...

Must not read much then as using PVA to seal a slab??
Quick search on here would reveal why not to.

 

[celt]

Must not read much then as using PVA to seal a slab??
Quick search on here would reveal why not to.

Forget the search, you tell us why not. Im curious

 

[celt]

what is SLC stand for ?

 

[Stef]

Forget the search, you tell us why not. Im curious

Seriously?
Tried to link a thread to this,
"PVA versus Primer",
Read up on that, you might also find out what SLC is!!