I prefer Fortifiber’s Super Jumbo Tex (800/773-4777, ) because of its consistently reliable quality. I always recommend 60-minute Grade D building paper as the first layer when it gets wet, it plumps up, which helps to seal around penetrations from lath fasteners. Even when the stucco actually sticks to the top layer, water can still drain out of the assembly.
The first layer - the one against the sheathing - acts as the drainage plane, while the top layer is sacrificial and protects the bottom layer from construction damage.
In my experience, it doesn’t really matter whether the walls are covered with housewrap or Grade D 60-minute paper, as long as you use two layers. Once you accept that the stucco itself lets water through, it’s easy to understand why the building envelope must be made watertight before the stucco is applied.
#GENE CONSTRUCTION KIT CRACK WINDOWS#
What we’ve learned is that the windows themselves are actually fairly weatherproof more often than not, it’s the building paper and the flashing around the window that leak. Not a week goes by that we aren’t water-testing a stucco installation, typically looking for a suspected window leak. My inspection business investigates moisture problems for several large builders in the region. No matter how skilled the plasterer is, rain will get behind stucco. Three-coat stucco is the most common exterior cladding here in Southern California properly installed, it’s tough, durable, and attractive.
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