0 Helpful?

How can I seal DensGlass (exterior drywall)?

I am using DensGlass on the exterior of my home (urban infill lot with zero clearance). I will be wrapping the exterior with Tyvek. I am thinking of sealing the joints of the DensGlass also. Is this overkill? What should I use to seal the DensGlass?

Asked by Charles Eichenlaub
Posted May 23, 2012 5:01 PM ET
Edited May 24, 2012 7:45 AM ET

Tags:

2 Answers

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.

I'm sure you are aware DenseGlass is typically a commercially used product. You need to go to GP DenseGlass webpage and download all the documents pertaining warranty and installation when applied as moisture and/or air barrier, and depending on the cladding you are using. Also, it is not a structural sheathing, so you must install bracing according to the IRC.

Answered by Armando Cobo
Posted May 23, 2012 5:28 PM ET

2.

Charles,
Here is the document you are looking for: Technical Guide: DensGlass sheathing.

Check the section titled "Air- and Water-Resistive Barriers." The guide notes:

"In areas that do not prescribe to current code requirements but still require long-term joint protection, either of the following two methods may be specified in lieu of an air- and water-resistive barrier system: Method 1) Apply minimum 3/8” (9 mm) bead of sealant to joints and trowel to provide a layer approximately 2” (51 mm) wide by 1/16” (2 mm) thick spanning the joint. Use backer rod for openings larger than 1/8” (3 mm). Method 2) Apply glass mesh joint tape to all joints, overlapping at intersections by the width of the tape. Apply approximately 3/8” (9 mm) bead of caulk along the joint. Embed the caulk into the entire surface of the tape with a trowel. Use backer rod for openings larger than 1/8” (3 mm). Follow manufacturer’s installation recommendations for use with DensGlass Sheathing, and design authority specifications. A variety of caulk and polymer-based “fill” materials may be specified, including GE, Dow Corning, Tremco, Sto, Dryvit, BASF and Proseco. Please contact the caulk manufacturer for its recommended caulks over DensGlass Sheathing."

Answered by Martin Holladay, GBA Advisor
Posted May 24, 2012 6:11 AM ET

Other Questions in Energy efficiency and durability

Concerns about backdraft and make up air

In General questions | Asked by Forum User | Sep 3, 15

Water Supply line routing

In Mechanicals | Asked by Stan Smith | Sep 3, 15

Alpen vs Inline

In Green products and materials | Asked by David Mosijchuk | Mar 25, 15

Ducted mini-split serving multiple floors

In Mechanicals | Asked by Reid Baldwin | Sep 2, 15

Is this a risky wall assembly?

In Energy efficiency and durability | Asked by Jeremy Coenen | Sep 3, 15
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!