I recently had my garage door bricked up with a breeze block wall. I've
noticed the wall is damp on the inside, obviously due to it being exposed to
the elements and being very absorbent. Is there any product I can use to put
a durable weatherproof coat on the outside of the wall without having to go
to the expense of having it rendered first?
Is that 1 part flour, 1 part sand to 6 parts water?
I'm definitely up for having a go, but I'm a bit of a Frank Spencer when it
comes to DIY. It needs to be very basic with comprehensive instructions...
Oh nooo. Film it for us eh? Lol
I would not assume paint or render will fix it though. You shouldnt be
getting penetrating damp on a new wall. Condensation sound more likely,
in which case render and paint wont help. Insulation with whatnot
It's made of "breeze blocks". These could be anything, including
thermalite (foamed cement mix) which is as soft as * and as absorbent
as blotting paper. Something Should Be Done or spalling may very soon
be a problem.
You can't waterproof cement render sufficiently to stop it coming
through breeze block. Maybe three coats and pebbledash?
What on earth was breeze block used for? It is absolute crap. You can
break through it with a teaspoon and all the water from the top course
will pour into the one below, all the 7 or 8 courses down to the DPC.
You could tile it, or batten it out and sheath it with waterproof ply
then put 3 or 4 layers of oil based paint on it and paint it every two
years for the next generation or so.
Personally I'd do it again with 2 courses of brick. Or a skin of brick
and a skin of breeze on the inside. Either that or skin the outside
with brick and extend the garage roof. (Just put a sheet on the top of
the end one with enough overlap.)
It would be useful to know what blocks were used.
It is extremely unlikely to be breeze blocks -- they haven't
been manufactured since before WWII.
Modern tanking I've seen looks like some type of resin.
Victorian tanking applied on outsides of cellar walls
is some type of pitch/tar.
Concrete thermal blocks do expand and contract slightly as they
get wet and dry out -- enough to make any render or plaster
lose key. So if moisture does get through to such blocks, I
would expect any render to fail. (You have to be careful not
to over-wet thermal blocks when plastering them for this
reason.) However, there are waterproofing additives for
mortars/renders -- I have used these in sand and cement
scratch coats on damp walls (not thermal blocks), and no
moisture comes through it to the gypsom finish plaster coat.
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