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How to waterproof a masonry blockwall , with a stucco finish painted, often the paint appears to create bubble pockets and destroy the visual surface. Retaining walls in yards have garden beds that require weekly watering and irrigation, but even when french drain systems are implemented, the concrete masonry block wall soak’s up and absorbs the moisture. As the moisture filters through the wall it is slowly breaking down causing water damage and destroying the integrity of the structural block wall. 
Xypex crystaline Concentrate is designed to work as long as the is intact, we have used this process on either the positive or the negative side of painted block wall surfaces. For repairs of existing finishes, all the painted finish coat must get removed. Small jack hammer or pneumatic chisel, the paint and the finish float coat, as well as the brown coat gets demoed off. Any cracks or deteriorated openings need to be treaty and filled prior to the Xypex application. Hairline cracks won’t be affected, but any 1/8″ or larger cannot allow the Xypex formula to perform it’s magic.
Once the demolition process is complete, a slurry mix of Xypex concentrate can be sprayed or brushed on, the thicker the better. After curing is complete a finish stucco can be reapplied to desired appearance. If being painted again, the paint has to be breathable and not an elastomeric sealer or the like. Be sure to consult your local codes and read all instructions pertaining to products used.
The best is here and now, we use Xypex to waterproof from the positive or negative sides of block walls that have been painted and their products work like nothing else on the market. Read further that even the President agrees with this newer waterproofing method, who knows how much he may know about building and construction methods? But we know here at My-diy that its works, over and over ……….
Remarks by President Obama concerning:
“NEW CONCRETE MATERIALS THAT LAST LONGER AND ARE WATERPROOFED FROM THE INSIDE OUT...”
At a press conference on July 2nd, 2009 in the Rose Garden of The White House, President Obama, after meeting with CEOs from a number of “innovative energy companies”, spoke about a new clean energy economy and the importance of encouraging these companies’ efforts.
Based on his discussions with these CEOs, President Obama cited energy saving examples such as LED lighting and solar energy innovation. Most importantly, from our point of view, he also included comments about new concrete materials:
“New concrete materials that last longer and are waterproofed from the inside out, and that can mean that bridges and roads and buildings can last 20 or 30 years longer than using conventional concrete.”
His comment indeed represents support for integral concrete waterproofing as an alternative to traditional membrane or barrier systems, a challenge and opportunity that has been the very basis of the concept, design and development of Xypex crystalline technology. Xypex has, without doubt, led the way with integral concrete waterproofing in North America and, although The President did not endorse any particular product, we are very pleased that he is so clearly drawing attention to our type of technology and innovation.
D’Arcy Mainwaring
President