How To Waterproof A Concrete Block Wall
How to waterproof your cinder block foundation.
How to waterproof a concrete block wall. With a stiff brush some tsp trisodium phosphate and some water wash away any loose material oil or dirt still clinging to the concrete. Water that enters through the pores can result to foundation seepage in the long run. Let dry before proceeding. Concrete blocks that are not protected and treated can suffer from severe damage over a period of time.
Use a masonry paint brush to apply the first coat of sundry or drylok paint to the cinder block walls. Radonseal is the strongest formulated penetrating concrete sealer available and is recommended for use on below grade and slab on grade. A paint roller or brush made specifically for masonry is best. You will often see efflorescence white minerals or mold growth on damp concrete.
Allow to dry overnight or for a minimum of 12 hours between coats. Using your masonry brush dip into the paint and stroke in any direction on the wall covering the wall completely with paint including all crevices in the block. This paint will go on much thicker than standard wall paint. Paint wall paint the cinder block wall with a thick coat of masonry waterproofing paint pushing paint into cracks and crevices of block.
Thoroughly clean the surface of your concrete before waterproofing. Most membranes like a clean surface to adhere to. The importance of waterproofing for concrete block.