Did you see my post a few weeks ago about a massive stucco failure? Stucco and it’s failures seems to be a perennial hot topic amongst builders, architects, and even realtors! I saw yesterday that it made the Builder Magazine top 5 list of dreaded callbacks.
So, how can we build a stucco assembly that will be just as durable and “safe” as a traditional siding house? First, we must understand that stucco is a Reservoir cladding. I’m quoting Building Science Corp on this cladding since I can’t say it any better….
“Claddings made of wood, fiber cement, stucco, concrete, and masonry all absorb water to varying degrees. Once the reservoirs get wet, the stored water can migrate elsewhere and cause problems. Therefore, reservoir claddings must be decoupled from water sensitive materials of the wall assembly.
As with any cladding in a water-managed assembly, drainage must be provided behind reservoir claddings. Drainage requires two things: 1) a drainage plane and 2) a drainage space (see Information Sheet 301 – Drainage Plane/Water Resistive Barirer).
Absorbed water migrates by capillary transport or changes to a vapor and migrates by air flow or diffusion. Therefore, in addition to drainage, reservoir claddings also require control layers for capillary water, airflow, and water vapor. ” - Building Science Corp – Reservoir Cladding Info Sheet Link to read the whole article
The quote above refers to both a “Drainage Plane”, and a “Drainage Space”. The Drainage Plane is basically the WRB or the waterproofing you see on the outside of the structure, but here’s where Delta Dry Stucco & Stone comes in as it provides a unique (and easy) method to provide that drainage space (often referred to as a Rain Screen).
Read More »