| Author |
Message |
John Hunter
Senior Member
Username: johnhunter
Post Number: 64
Registered: 12-2005
| | Posted on Tuesday, September 16, 2008 - 07:38 pm: |    |
Does anyone have any experience with Certainteed's (formerly BPB's) "GlasRoc" sheathing? I'm reviewing it as a comparable product to "Dens-Glass Gold" but only have the manufacturer's data to go by.
Thanks. |
Anonymous
| | Posted on Wednesday, September 17, 2008 - 11:15 am: | |
I have been specifying both as equivalent since before Certainteed bought BPB with blessings from our local building envelope consultants. |
William C. Pegues, FCSI, CCS
Senior Member
Username: wpegues
Post Number: 754
Registered: 10-2002
| | Posted on Wednesday, September 17, 2008 - 11:51 am: | |
I have a nice sample of the product here as well as the data. I have them listed in my specification as a contractor's choice, he can choose either the Dens product or the GlasRoc.
Been doing that for a bit more than a year.
William |
Steve Gantner, CSI, CCS, CCCA
Senior Member
Username: sgantner
Post Number: 11
Registered: 08-2007
| | Posted on Wednesday, September 17, 2008 - 12:15 pm: | |
We have been allowing both products for quite a while now. Have recieved no complaints from Contractors or Owners. In fact, the Contractors enjoy having a choice. |
George A. Everding, AIA, CSI, CCS, CCCA
Senior Member
Username: geverding
Post Number: 448
Registered: 11-2004
| | Posted on Wednesday, September 17, 2008 - 12:45 pm: | |
National Gypsum is also manufacturing a sheathing product to meet ASTM C 1177 “Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing”. Expect the other manufacturers to follow suit now that G-P's patent has expired. I have started not naming products but using ASTM C 1177 as the criteria for sheathing. |
Steven Bruneel, AIA, CSI-CDT, LEED-AP
Senior Member
Username: redseca2
Post Number: 140
Registered: 12-2006
| | Posted on Wednesday, September 17, 2008 - 04:56 pm: | |
Our firm would like to be assured that there is a true equal to DensGlas for our public bid projects, but when looking at the ICC Evaluation Reports for these products we have noted the following:
DensGlas Gold complies with ASTM C 79, which covers "core treated" exterior sheathing.
GlasRoc complies with ASTM C 1177, glass mat gypsum substrate. The core is typically gypsum and water resistant but not treated. Treated core systems seems to be superior in terms of water resistance.
Water resitance is the same for both.
C 79 allows surface water absorbtion of not more than 1.6g on front and back surfaces after 2hrs.
C 1177 does not address water absorbtion.
GlasRoc info does not address R-value or permanence.
Note also that DensGlas allows application of self-adhereing systems. GlasRoc apparently does not. |
Anonymous
| | Posted on Wednesday, September 17, 2008 - 06:02 pm: | |
Not sure what you are looking at, but C1177 covers glass-mat gypsum sheathing, which includes Dens-Glass Gold. C79 is for paper-faced gypsum sheathing. |
4specs.com Home Page