Now, water-proofing is not just about sealants. Flashing is another integral part of properly sealing a structure against the elements.
From our experience, we have concluded that the majority of stucco homes in Houston, Texas have been constructed with incorrect flashing practices. Some wrong doing with flashings include allowing for the roofing shingles to be in direct contact with a stucco substrate (as shown below). When water cascades down the shingles against the vertical stucco plane, the stucco will wick up the water which can ultimately destroy the stucco surface. This is the same situation when it comes to stucco being in direct contact with the floor (also shown below).
It is required, by codes in Texas, to allow for a clearance between the stucco substrate and the termination (paved surface or roof line). This also requires a correct venitlation to allow for cappilary drainage of water.
Many homes are constructed without the benefit of any flashing at converging roof lines, balconies, or chimneys. The lack of proper flashing can produce costly repairs if not corrected quickly.
Typically, with new flashing installation, the old stucco surface must be removed and new weep-screed or kick-out/diverter flashing should be inserted. The area is then re-stuccoed and protected from future damage.
Missing clearance at roof line Missing clearance at flat surface
Proper clearance with proper weep-screed installed to allow for cappilary drainage.