MEMBRANE MADNESS

[happyhero]

Hi

Can any body help me, I have a 1930's house and I'm re-doing the kitchen. Half the kitchen is floorboards and the other half has tiles over (I think) concrete. These tiles are approximately but not exactly level with the floorboards.

I want to have some amtico flooring layed in this room and they have advised since the house was built 1930's and the tiles seem original, that I should dig this area up and lay in a membrane with concrete on top to level with the floorboards at the same time. Without the membrane they reckon it will get a bit damp. I am happy with this idea because this end does want sorting out, if only to get it level, but what membrane do I get?

I looked on Screwfix

here

but they have blue ones and black ones, both which both seem to comply with some sort of regulations.

Which one should I get and what gauge should I get?

I would appreciate any help and I would also be interested to know what the difference is apart from colour, and why would you use different gauges?

Anybody please enlighten me.
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moderator

edited to correct link

 

[Thermo]

different guages for different situations. go for the blue heavier 1200 guage. for the difference in pence its worth it. The blue stuff is for your purpose, the black stuff is the cheaper variant and less durable (used for such things as covering areas in gardens as a weed suppresent etc). Make sure you put down some sand blinding first so it doesnt get punctured