tiling outside

**biffa** · 14-06-2009

i have to tile a patio onto an oversite of concrete. the tiles are 1200 x 600 porcelain, i need to build them up about an inch to get level with inside.
is it possible to lay them on a bed of mortar or do i have to use an adhesive with porcel bond, the latter being expensive because there's about 30m2.
any advise would be appreciated

biffa

**david campbell** · 14-06-2009

can be laid on a mortar bed no bother,just make sure you use a good grout!

**whitebeam** · 14-06-2009

I'd be throwing some sbr into the mix as well

**biffa** · 14-06-2009

thanks for the advice chaps, was hoping i could use mortar cos sticky would have trebled the price, a bricky told me to pva the tile before i laid it, don't know if this would be good or bad.

**whitebeam** · 14-06-2009

No not pva, your'll get a failure for sure

**david campbell** · 14-06-2009

try reading this-
http://www.tilersforums.co.uk/tile-a...?highlight=pva
my old man is a bricky and i'm still trying to explain this to him!
he's rather old school and always knows better lol

**timeless john** · 14-06-2009

Biffa - 30sq mts is a fair size patio and to build up 'about an inch' (24mm)is not a lot.
Have you checked for the falls away from the house as you may not have as much to build up as you think!
I would prefer to build up the patio and make sure I use a porcel bond adhesive.
Have fun and I hope the weather stays dry.

John.

**biffa** · 14-06-2009

got a drain running full length across the house so drainage not a problem.the kitchen is already tiled in these tiles(did it in the winter).
7m of folding glass doors seperating kitchen from patio, they want to open doors in the summer and have it all look as one.
brickbond as well so got to be perfectly flat.
wish me luck, i'll need it, its bound to **** down.

**timeless john** · 14-06-2009

Biffa - You want a slight fall away from the house so water/snow does not lie on top of the patio tiles.
IE.24mm over say 3metres is not a lot of fall.

John.

**Daz** · 14-06-2009

TJ is correct, there needs to be a fall.

I had a similar job recently, but instead of patio it was a pool surround, so the fall had to be away from pool edge to the drain. The fall is hardly noticeable but sufficient.

I formed the base first, then tiled - it is easier than trying to create a fall will adhesive IMO.

I have got to go and do some more tiling at the house soon, so will try and get some pics with the doors folded right back - the brickbond looks the mutts!