Garage walls are a perfect example of this.
How to seal a concrete block wall.
Patch any holes in the basement cinder block wall with your hydraulic cement.
Concrete is a porous material when fully cured.
Water moves easily through porous concrete so sealing interior walls is necessary to prevent moisture from seeping in promoting mold growth and that cold damp basement feel.
The cement becomes hard quickly so be time efficient.
Cinder blocks are classified as permeable to water and water vapor 10 perms.
Preventing resultant creation of acidic conditions in the concrete which in turn will cause rusting of all steel reinforcement.
Most concrete block or cinder block walls stay as is if used as retaining walls or foundations but some serve as a finish wall as well.
Concrete blocks commonly begin to show signs of dampness or worse leak water soon after exterior waterproofing.
Seal the entire concrete wall with a waterproof masonry.
Some tests show 4 8 perms for hollow concrete blocks and 2 4 perms when the blocks are filled with a slurry mix of concrete.
Block foundation walls will provide only a weak barrier against capillary water seepage and water vapor.
Heavyweight concrete blocks are semi permeable 5 perms and less so when the hollow cores are filled and packed with a slurry mix of concrete about 2 perms.
Push the cement into the cracks and crevices making sure to pack and seal.
If the conditions outdoors are cool allow the bucket contents to sit in the sun for an hour to loosen the contents.
Allow the cement to dry before proceeding usually 24 hours.
A cinder block is much more porous compared to a standard concrete block or poured concrete.
Distribute the tar evenly across the wall leaving no more than a 1 16 inch thick coat.
Step 4 paint on two coats of concrete block sealer to the interior of the block.
Why cinder block walls leak.
How to seal corners and slab penetrations.
A great newly concrete poured wall with 8 10 inches thick is considered impermeable.
It can also develop small pinhole openings that act as capillaries for water transmission.
The best and easiest way to make sure your cinder blocks will not leak is to take preventive actions before you need it.
This sealer will penetrate the block pours sealing them off.
How to seal cinder blocks walls.