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Ive got to tile onto a new concrete floor that was laid about 7-8 weeks ago.

Is there anything i need to put on the floor before I start tiling it i.e. primer or pva or can I just lay the tiles straight down?

It's best to check what is says on the instructions for the adhesive that you are using. Some adhesive manufacturers will specify that you have to use a primer.

The concrete is likely to be dusty so give it a good sweep first then give it 1 or 2 coats of an acrylic primer such as Mapei Primer G or BAL AD1. Then tile.

the new concrete floor is it sand/cement.(70-75mm thick)..
or is it gypsum based 40 -45mm thick(anhydrite) ask who every supplied/laid it.
what you should do is gently sand the top of it to remove any laitance (skin) from it, then at least 2 coats of primer(as abvove) up the floor then when dry across the floor as well.
then a flex adhesive,but as already been said ask the manufacturers of the floor adhesive you will be using.

-- Wed Apr 28, 2010 10:23 pm --

the rule for a new floor drying(depends on climate) is 1mm per day.

Tictic....thought BAL did an addy for newly laid floors that could be used 24 hours after pouring??

r.o.c
yes they do mate "green screed"..but ...
if i remember mate, even when using travertine etc(stone) you still have to let it dry out(i may be wrong tho.. )..but always best to find out the type of floor your tiling first, as above s/cem..or gypsum based.

most house builders are using a faster curing type now 40-45mm thick (gyvlon)..so slighty more prep work involded so always find out what type you have,then act accordinly bud..

-- Wed Apr 28, 2010 11:02 pm --

the "green screed" mate is slighty.. "dearer".. than most other floor addys...

the new floor is sand n cement screed 75mm thick.

thanks for the advice guys. Mapei primer it is then.