Frequently Asked Questions about Stucco Application
What is the correct thickness of stucco? Stucco thickness depends on the backup system and on whether or not lath is present. In ASTM C926, the Standard Specification for Application of Portland Cement-Based Plaster, thicknesses are provided for scratch, brown, and finish coats. Over frame construction, lath must be used. Over solid substrates—which include [...]
Is it necessary to use a bonding agent with stucco? Products that increase the adhesion of plaster to substrate or plaster to plaster are called bonding agents, and are either surface applied to a substrate or integrally mixed into the stucco. A distinction should be made between framed construction and solid backing (such as masonry [...]
Does stucco require curing? For cement-based materials, curing is defined as maintaining an appropriate temperature and moisture content for a specific period of time during the early life of the material. All traditional portland cement-based materials, such as stucco, require curing. Sun and wind, alone or in combination, drive moisture out of fresh stucco. To [...]
Can stucco be applied over painted walls? This is a common question that often arises when people are updating older construction. Stucco is a cost effective finish, relatively easily installed, that improves the appearance and creates a water resistant wall surface. A painted surface will not typically absorb water and, as such, is a [...]