Messages and Online Forum Q&A

Re: Stucco systems

From: info@builderswebsource.com
Category: Other/Misc
Remote Name: 63.198.181.43
Date: 23 Aug 2001
Time: 08:49 PM

Comments

We do not recommend mixing processes as you propose. If you want to use traditional Portland-cement based stucco with stucco netting, then you must, by code, apply stucco paper over the sheathing (to prevent water damage), then nail or staple stucco netting over the stucco paper.

You can use a two-coat stucco process (resulting in approximately 3/4" thick stucco). This consists of a scratch coat and finish coat. In a three-coat process, you'll have a scratch coat, a brown coat and a finish coat. This results in stucco that's about 7/8" - 1" thick. We always recommend a 3-coat process if you can afford it.

There are additives, such as fiberglass strands, that can be added to the base coat to help prevent cracking.

Unless you're using foam that's several inches thick, the insulation value is virtually nil for thin foam. Therefore, if you're thinking of this for insulation reasons, you're better off framing your home from 2x6 studs and using R-19 in the walls. This will save on air conditioning during the warm summers in Sacramento. Good double-paned windows with low-e glass also help.

The only case where stucco netting is sometimes applied over foam is in ICF homes (Insulating Concrete Forms). These walls are poured concrete between thick layers of EPS foam (typically about 2" thick per side). In this case, there is less chance for water infiltration since the walls are solid concrete.

We hope this clears up our position. Whatever you do, particularly if it's non-standard practice, make sure you have the approval of your local building inspector, otherwise you risk code violations, which could be costly.

Good luck!

Builders Websource

Article Tools

Builders Websource® is a corporate member of ASTM International—a non-profit engineering body dedicated in part to the standardization of building materials specifications, products, systems, and test methods for improved health, safety, and reliability of residential and commercial structures.

Copyright © 1999 - 2008 Builders Websource®, an InBuild™ company. All rights reserved.