Base of wall: Stone veneer on concrete masonry backing
Scott Conwell, FAIA, FCSI, LEED AP
Architect | Influencer | Champion of good design and qualified labor. My feed contains inspiration and education on tile, stone, masonry, and terrazzo on behalf of BAC craftworkers and contractors.
This rubble stone veneer wall base detail shows a flexible thru-wall flashing mechanically fastened to the CMU backup through a termination bar, with a continuous bead of sealant along the top of the termination bar. The exposed portion of the flashing is a sheet metal drip edge secured held in place by mastic or sealant, with a hemmed edge, extending from the face of the stone veneer about 1/2". The flashing has an 8" (nominal) vertical leg, and weep vents are spaced at 24" o.c. There is an air/moisture/vapor barrier on the cavity side of the CMU with a self-adhering transition membrane over the vertical control joint, providing continuity of the air barrier. 2" rigid insulation resides in the drainage cavity. A full-height drainage mat with filter fabric allows for unobstructed drainage and guards against mortar bridging to the backing; this is of particular concern due to the varying thickness of the stone. This detail also illustrates a vertical movement joint comprising a control joint in the CMU backing and an expansion joint in the stone veneer.
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