How To Seal Exterior Concrete Block Walls

How to seal a leaking concrete wall. How to seal repaint block walls. Concrete is an inexpensive way to create a strong cover.

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Step 1 clean the wall.

How to seal exterior concrete block walls.

A great newly concrete poured wall with 8 10 inches thick is considered impermeable. Standard concrete block is semi permeable 5 perms. 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. Stucco is similar to concrete but more decorative.

A cinder block is much more porous compared to a standard concrete block or poured concrete. Cinder block walls are strong and inexpensive but they aren t always pleasant to look at. Regardless of the finish and whether the concrete has already been painted the cleaning procedure is very similar. The best and easiest way to make sure your cinder blocks will not leak is to take preventive actions before you need it.

Features flexible encapsulated polymers for a beautiful smooth waterproof finish. If you properly paint a concrete block wall it will last for years with little upkeep. 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. Using a roller roll on the sealer allowing 30 minutes of drying time between each coat.

There are two basic types of finish on concrete block smooth and split face. How to seal cinder blocks walls. 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. This sealer will penetrate the block pours sealing them off from any invading water.

Here are 5 basic steps to help you do the job successfully. Why cinder block walls leak. Block walls particularly in basements may be damp. However some walls gush water through openings in the concrete.

Concrete walls sometimes only leak periodically such as after a hard rain or during snow melts. Whether keeping out the damp or sprucing up a room sealing and repainting block walls adds value to a room. Block foundation walls will provide only a weak barrier against capillary water seepage and water vapor. Fortunately you have many options for improving a cinder block wall.

Recoat the surface every two years. Concrete blocks commonly begin to show signs of dampness or worse leak water soon after exterior waterproofing. Paint on two coats of concrete block sealer to the interior of the block. Cinder blocks are classified as permeable to water and water vapor 10 perms.

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