The outside door going into my garage had a standard aluminum and wood
sill that leaked small amounts of water into the garage during heavy
rains. The water was getting in under the sill and I never could seal
things up. It didn't do any damage, but I got tired of it, so I ripped
out the sill and cleaned things up.
I'm thinking about using a qwikrete buildup to replace the old sill. The
problem is that it would have to span the garage slab, and the slab on
the outside of the door, and any differential movement between the two
is likely to cause a break. We have swelling clays here and movement is
probably what caused the old sill let water through.
Any ideas on the best way to proceed? A couple pics in the link below
show the situation.
How about a layer of rubber matting on the outer concrete, and then
pour the concrete sill over that? Perhaps engineer a re-enforcement
grid and anchor it into the internal concrete to make sure it stays
with the slab. Or instead of the permanent rubber matting, just use a
spacer when pouring the concrete, and put a good layer of caulk under
the edge when finished - or caulk the joint well, then pour the
overhanging sill over the afore-mentioned spacer, and leave the sill
sitting above the outer slab to allow movement. Mix the concrete extra
strong and make sure you cure it well (keep it damp for a week or two)
Caulk it better than the last time. Did it have caulk before?
Silicone caulk is good and there is that new brand, whose name I can get
for you, that says it sticks and stretches even better than silicone.
It had lots of caulk, everywhere, numerous times. It had a very tight
seal between the bottom of the door and top of sill rubber seals. It
even had a 2" rubber seal barrier that I attached to the sill to seal
against the door when closed - nothing worked to stop the water leakage
into the garage.
I was dealing with this leakage for over 10 yrs. Yesterday, when I
ripped out the old sill, the interior wood was rotted out. This side of
the house gets the prevailing wind direction, and apparently rain water
was being driven into this area and getting onto the garage slab via the
space between the outside slab and the garage slab, which was overlain
by the old wood/aluminum sill, the outside slab being a few MM's higher
than the garage slab.
The water leakage into the garage didn't harm anything, but I just got
tired of having it happen.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.