On Thu, 17 Jan 2013 16:14:40 +0000, Nightjar wrote:

BTW don't forget that, in most properties, water can get under the
floor through air bricks, so they need protection too.

Or through the drains. Downstairs loo? Floor drain in the scullary?

TBH fixing to the door frame seems a bit pointless to me. The water will
just find it's way between the frame and the wall. Don't think a tiny
bead of five year old silicon is going to keep it out...

Bits if ali U channel on the outside faces of the wall, solidy fixed and
witha full layer of sealant behind. Don't forget the horizontal at the
bottom of the opening. The board that slide down into this needs a
compliant seal of somesort arranged such that the weight of water
compresses it even harder. If there is a joint between boarsd that will
need a compliant seal as well and again idealy one where the weight of
water makes it seal harder. Not sure how one would arrange that.

Also see what your insurance company has to say about DIY flood gates. In
my view they should support you, as you are trying to reduce the losses
but knowing insurance comapnies if you don't use "approved" kit they'll
use it as hook to hang not paying out on.

--
Cheers
Dave.