Jerry Simon Posted July 23, 2021 Report Share Posted July 23, 2021 Wood frame house with what appears to be a split face block veneer (approx 3-4" thick block veneer installed atop a concrete foundation up against a wood stud wall). Some of the block is stained brown, and a few of the weep-screeds are stained brown. Appears staining is from wood components (tannin) or corrosion from lintels behind the veneer? Flashings and weeps appear to be well done. Any concerns with this being split-face block (versus structural concerns with a structrual split-face block)? Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted July 24, 2021 Report Share Posted July 24, 2021 Could be asphalt from the felt? 1 Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted July 24, 2021 Report Share Posted July 24, 2021 My concern would be water absorption since SFB is like a sponge. Depending upon the time of year and weather conditions, I would assume a lot more water would gather behind the veneer. Some SFB is manufactured with a water repellent. Quote Link to comment Share on other sites More sharing options...
BADAIR Posted July 24, 2021 Report Share Posted July 24, 2021 (edited) discoloration could be anything recently had separate black brick veneer with black mortar & natural austin stone veneer with white mortar gigs that browning-yellowing all of a sudden appeared post-construction at isolated hi-mid-low areas of brick, stone, mortar materials no moisture intrusion bleed & not a thing w/vb, sheathing or from the required 1 1/2" void was found after invassive-destructive testing, bricks & stones were removed the culprit was determined to be the "slag-slop" mortar cleaning products used by the masons they're removing all affected materials... Edited July 24, 2021 by BADAIR Quote Link to comment Share on other sites More sharing options...
mgbinspect Posted December 24, 2021 Report Share Posted December 24, 2021 It seems to me that if the staining was caused by moisture behind the veneer, only the very bottom of the plastic insert in the weeps would be stained along with the very bottom of the course of block resting on the flashing. Sometimes irrigation systems cause staining like this if they are on a well, which is done here near the coast. Split faced concrete block are indeed porous, but it takes a whole lot of rain to cause water to significantly penetrate 4" of masonry. When it does, the real cause is typically head joints that are not full, which is also true of brickwork. Properly installed masonry rarely permits significant water penetration, but poorly installed masonry can be a nightmare. Quote Link to comment Share on other sites More sharing options...
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