On 21 Sep, 11:14, "The Medway Handyman"
wrote:
Adam wrote:
Hi All,

On the last part of "preparing the ground" from this page:
http://tinyurl.com/homebase-decking
...it says "Place squares of bitumen DPC membrane over the top of the
concrete...".

I forgot to actually look up what this was (I now know "DPC" is damp-
proof-course) so was then wondering round B&Q looking for something
which looked plausible containing bitumen, and ended up with a roll of
bitumen shed felt. Is this a reasonable alternative? I notice on the
B&Q website the roof felt comes under the "damp proof" category.

I use this when building deckshttp://www.screwfix.com/prods/49590/Building/Damp-Proof/Damp-Proof-Co...

Take the felt back to B&Q & swap it for http://tinyurl.com/3rcygm

Thanks, that's only 30cm wide, but my concrete slabs are 40cm across.
Presumably it's a problem if there's a gap in the DPC?

Adam