Originally Posted By: rcloyd
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This excerpt is from the Brick Industry Association "Technical notes on Brick Construction" section 7A:
One of the most important items for preventing water penetration is the use of proper sealants and caulking around openings in masonry walls. Too frequently, caulking is considered a means of correcting or hiding poor workmanship rather than as an integral part of construction.
The subject of joint sealants is far beyond the scope of this Technical Notes, but a few comments are in order. For normal joints around windows and other openings, where little or no movement is expected, caulking should be done using a solvent-based acrylic sealant or a butyl caulk. For joints subject to large movements, such as expansion joints, an elastomeric joint sealant, conforming to the requirements of ASTM C 920, should be used. This includes silicones, urethanes and polysulfides. In no case should an oil-based caulking material be used. Regardless of the type of sealant chosen, proper priming and backer rods are a must.
The Brick Industry website is: http://www.bia.org/
Russell G. Cloyd
Intra-Spec Home Inspections
& Code Consulting, LLC