I have my shed almost finished.....I poured slab, then one row of concrete blocks, and then built shed....It rained quite a bit last night and I noticed some wetness at the mortar joint between slab and concrete blocks in a couple of places along one wall only. the top of the slab is at least 4 inches above grade. I guess water is passing through mortar.......Do I need to seal mortar joints somehow? any advise appreciated...
Brush a couple of coats of cementitious waterproofing, such as Thoroseal, on the outside of the block and lapping it onto the concrete. It comes in gray/grey and white.
How much of a roof overhang do you have on the shed?
RThe roof overhang is about 10 inches.
Block walls are not waterproof. You can trowel stucco over it or you can paint it with a sealer.
That's reasonable for a shed. I was asking because I've seen quite a few sheds where there is no overhang and the lower parts of the building take a bigger beating from the weather over the years - they rot more quickly.
R
There are products specifically for concrete. I used a white sealer that contains both rubber and concrete to paint my basement poured walls. Either at Lowes or Borg. For cracks there is a caulk specific for concrete.
and use the products on the OUTSIDE not the inside. don't want moisture trapped inside the block.
nate
Does that stuff stay flexible? I'm still having a problem with water going under the block and mud and into the crawl space slab under the house. Hydraulic Cement didn't work after a couple warm/cold cycles.
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