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I'm building an extension on a concrete slab...i forgot to put down a water proof membrane...its too late now (as the slab is done)...but i haven't put the wooden frame up (its a brickveneer extension)...I was just wondering..if it would be a good idea to
put the bottom plate on a strip of aluminum flashing, rather than directly on the concrete...
just as a bit of insurance.... is this sensible?
plastic flashing is good enough and easier to work with
I am assuming you forgot to put down your poly under the slab ? is this right ? How did your steel inspection get passed for your slab ? You will probably get rising damp problems ?
Well the extension started off as a vehrander (so no poly under slab)...and now i put a new building permit in to add walls to it...to make it part of the house.. anyway, its on a little slop...with nice drainage away from the slab, and the slab is reasonably high...about 30-50 cm, so i'm hoping that i don't get too much rising damp... anyway, i'll put some flashing under the bottom plate..just as a bit of extra insurance....if anyone has any better ideas...let me know...thx for all responses...
Maybe a good coating of epoxy paint over the slab would help.
If the slab is lower than the house floor you could batten it over a membrane and fit a sheet/timber floor at the same level as the house floor
Stay with the flashing under the walls.
Don't use alu as it will corrode out in less than a year. Use a plastic viscourse under the timber plates to stop any rising damp
There are a number of surface paints that can be used to seal the concrete which would be advisable to use especially if you are going to lay carpet or vinyl.
This is what I was thinking .Quote:
Originally Posted by Barry_White
Seal the slab with 2 part epoxy and any holes with sikaflex or simular.