The unit’s smooth, concrete texture creates an attractive wall surface for both interior and exterior applications. Additional textures such as split-face and glazed are also available for use in projects.
The design possibilities are further enhanced by a wide range of attractive color blends and matched custom colors.
Natural Salts in Color Customized Masonry Units (CCMU) will cause efflorescence when excessive moisture is introduced to the units.Click Each topic to expand:
1. CCMU’s should be laid in wall ASAP
2.Keep CCMU’s COVERED AT ALL TIMES to prevent rain penetration that will cause efflorescence.
3.Block USA recommends the erection of a Sample Panel for color verification of units and mortar as well as good workmanship practices.
CCMU’S must be cleaned properly including mortar droppings, mortar splatters and efflorescence. Improper cleaning materials and/or methods will also harm water repellency.
Water Repellency should not be confused with waterproof. Block USA’s CCMUs are water repellent using Integral water repellent admixture. Particularly in the Southeast, west and southwest facing walls are subject to extra moisture from natural flows of the JET Stream. Therefore, Block USA recommends that all exterior walls be treated with a sealer to provide the highest level of water repellency.
The use of any sealer on block surface should be carefully considered. If the sealer is applied to a wall that still contains the basic ingredients for efflorescence (moisture) the resulting problems could be severe. As the salt solution attempts to migrate toward the surface most of the salts become trapped in the concrete pores just inside the sealer. The result is an interior crystalline buildup called sub florescence which can exert considerable pressure and spall the unit face. If required the following should be considered:
Commentary:Sealers can discolor CCMUs.
Topics include: Pre-construction: Guidelines for block and job site storage; Construction: At block laying, recommendations on water repellants and sealants; At completion, guidelines on cleaning, dealing with efflorescence staining and natural color variations.