How To Seal Exterior Concrete Block Walls

If you properly paint a concrete block wall it will last for years with little upkeep. Paint on two coats of concrete block sealer to the interior of the block. Whether keeping out the damp or sprucing up a room sealing and repainting block walls adds value to a room.

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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.

How to seal exterior concrete block walls.

Concrete blocks commonly begin to show signs of dampness or worse leak water soon after exterior waterproofing. Concrete is an inexpensive way to create a strong cover. How to seal cinder blocks walls. Cinder blocks are classified as permeable to water and water vapor 10 perms.

Drylok extreme latex base masonry waterproof coating is drylok extreme latex base masonry waterproof coating is ideal for interior exterior above or below grade masonry walls basement walls foundations landscape walls cinder blocks concrete blocks bare concrete swimming pools stucco and brick. Block foundation walls will provide only a weak barrier against capillary water seepage and water vapor. Cinder block walls are strong and inexpensive but they aren t always pleasant to look at. Step 1 clean the wall.

Using a roller roll on the sealer allowing 30 minutes of drying time between each coat. Concrete walls sometimes only leak periodically such as after a hard rain or during snow melts. A great newly concrete poured wall with 8 10 inches thick is considered impermeable. 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.

Recoat the surface every two years. Block walls particularly in basements may be damp. Features flexible encapsulated polymers for a beautiful smooth waterproof finish. Why cinder block walls leak.

This sealer will penetrate the block pours sealing them off from any invading water. Standard concrete block is semi permeable 5 perms. The best and easiest way to make sure your cinder blocks will not leak is to take preventive actions before you need it. However some walls gush water through openings in the concrete.

How to seal repaint block walls. Fortunately you have many options for improving a cinder block wall. There are two basic types of finish on concrete block smooth and split face. How to seal a leaking concrete wall.

Regardless of the finish and whether the concrete has already been painted the cleaning procedure is very similar. A cinder block is much more porous compared to a standard concrete block or poured concrete. Here are 5 basic steps to help you do the job successfully. Stucco is similar to concrete but more decorative.

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