Can you put stucco over foam board?
Install stucco as an exterior wall cladding over rigid foam insulation with proper preparation to provide water management as well as a sound substrate for the stucco. Flash all windows, doors, and other penetrations to the water control layer prior to installing the insulation.
Can stucco be applied over OSB?
Today’s equivalent to that is cement block construction. But more often than not, stucco is applied today to homes which are made of standard wood construction, covered with plywood sheathing. Either softwood construction-grade exterior plywood can be used or OSB .
Can you use foam board instead of OSB?
OSB Replacement. Styrofoam Residential Sheathing offers a lightweight, efficient sheathing alternative to high-priced OSB panels. One solution: Specify rigid Styrofoam Residential Sheathing instead of OSB, for sections of the home that can be brought to code with other stiffening measures.
How do you install stucco over rigid foam?
How to Install Stucco over Continuous Rigid Insulation
- Determine the location of the wall’s water control layer (the drainage plane).
- Install a water control layer (building wrap, self-adhered or fluid-applied membrane) over the face of the exterior sheathing and flash all windows, doors, and penetrations to that layer.
What is the foam under stucco?
Extruded Polystrene (XPS) It is the insulating foam board of choice for exterior stucco walls that need to be well protected form the elements and highly insulated. It also provides a durable backing to stucco walls and stands up well to wet conditions.
Is sheathing required for stucco?
STUCCO APPLICATION OVER WOOD SHEATHING Building paper is required where stucco is applied over wood structural sheathing. Note: The International Building Code and the International Residential Code require two layers of Grade D building paper over wood-based sheathing.
What do you put under stucco?
Sheathing is basically the “backing material” that can be found underneath the various layers of stucco that form the backing of residential and commercial buildings. They can be made out of wood, cement, gypsum, fiberglass and other materials.
What is the disadvantage to using rigid foam sheathing on exterior walls?
Disadvantages. Rigid foam insulation in wall cavities must be tightly fitted to stop air infiltration. Joints between sheets and boards must be taped to prevent air flow. Rigid foam is susceptible to sunlight.
Does foam board need a vapor barrier?
Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.
How thick is stucco and foam?
The nominal thickness of the one-coat base coat should be 1/2 inch rather than the code minimum 3/8 inch. For quality control purposes, Specify wire made in North America • One-coat stucco may be applied over gypsum sheathing, rigid foams or wood based sheathings.
What kind of foam is used for stucco?
polystyrene
Polystrene. Most of the foam boards used with stucco in the one coat system are made out of polystyrene, which is moisture repellent and relatively rigid in terms of its structure. Polystrene is similar to polystyrene foam, but is harder and more durable. It is also used extensively in packing and model making.