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ZIP System R-Sheathing
1Are There Limitations with Exterior Finish Cladding (Adhered Stone, Stucco, Vinyl Siding, Brick, Cedar, Ect.)?
Approved exterior claddings are any cladding referenced in the building code or with its own ES report qualifying it as an approved exterior cladding. Adhered stone veneers should not exceed 15 psf.
2What Type of Nail Should Be Used to Install R-Sheathing?
If used as wall bracing or in the construction of shear walls, nails with a minimum shank diameter of 0.131-inches and long enough to penetrate the studs 1.5-inches should be used. If not used as wall bracing or in a shear wall, the nails only need to penetrate the studs at least 1-inch. Note: 8d common nails have a diameter of 0.113-inches.
3Can ZIP System R-Sheathing be installed over light gauge metal studs?
For information on installing ZIP System R-sheathing over metal framing please see the Tech Tip ZIP System R-Sheathing over Light-Gauge Metal Framing.
4After R-Sheathing is Installed on the Walls, How Long Can R-Sheathing Be Exposed Before Finished Wall and Roof Coverings Are Installed?
5Can Liquid Flash Be Applied to R-Sheathing Panel Seams/Rough Openings?
Yes. ZIP System Liquid Flash bonds very well to the ZIP System panel and the polyiso foam layers.
6Do I Need to Gap These Panels? How Does the Overlap Work?
Foam insulation is oversized on one 4-ft and one 8-ft. edge relative to the ZIP Sheathing to accommodate proper gapping of panels. Panels should be installed with foam edges touching. Please coordinate panel field placement and orientation in order to take advantage of this gapping feature.
7Can Staples Be Used to Install R-Sheathing Instead of Nails?
Yes. Staples are recognized as a suitable fastener for installing ZIP System R-Sheathing. Additional fastening information can be found in the R-Sheathing Evaluation Service Report (ESR-3373).
8What is “Method 3”?
There are eight different braced wall construction methods that utilize different materials listed in the code. Method 3 is the prescriptive bracing method that uses wood structural panels.
9Will the Foam on R-Sheathing Panels Compress When the Panels Are Installed?
The foam has a Compressive Strength of 20 psi when measured by ASTM D 1621. A slight amount of compression may be seen around the perimeter of the panel if fasteners are over penetrated, however this has little to no impact on the performance of the product. Compression of the foam is more likely to happen with nails that are hand driven with a hammer. Installer should be careful not to use excessive force when hand driving nails.
10How Do We Handle R-Sheathing If It Gets Wet Before, During or After Installation?
ZIP R-Sheathing should be protected from moisture before the panels are installed. See ZIP System R-Sheathing Installation Manual for more information on storage and handling. R-Sheathing warranty provides 180-days of exposure once installed.
11Do Foundation Cripple Walls Need to Have Drywall Installed?
R sheathing should be treated the same as any other foam plastic insulation. Chapter 3 of the IRC and Chapter 26 of the IBC contain ignition barrier requirements for the use of foam plastic insulation within crawlspace areas. These requirements vary depending on the use and the access provided to the space.
12Can R-Sheathing Panels Be Attached to Existing Plywood or OSB Sheathing?
Yes, but only if the cavity wall insulation has a vapor permeance greater than 1 and only if the R-Sheathing is not part of the lateral force resisting system.
13Can R-Sheathing Be Used in Roof Applications?
No. R-Sheathing is currently only code-recognized in ESR-3373 to be used in wall applications.
14Do Attached (or Detached) Garages Need to Have Drywall Installed?
Both the IRC and IBC require that foam plastic insulation be separated from the interior of a building by an approved thermal barrier. This barrier may be 0.5 inch gypsum wallboard or any other material that is approved for this purpose. The local authority having jurisdiction should be consulted to determine which alternate materials may be approved for this purpose.
15Can Builders Use R-Sheathing in Combination with Other Sheathing Types?
No. On structures sheathed with ZIP System R-Sheathing, R-Sheathing should cover 100% of the sheathable area.
16Can R-Sheathing be used in continuous wood structural panel sheathing per IRC Section R602.10.5?
No. Bracing amounts in 2009 IRC Table R602.10.1 may not be reduced per section R602.10.5 for continuous sheathing.
17How do we address deck ledgers or other cantilevered structures?
Exterior decks should be constructed as free standing structures per AF&PA DCA6, Prescriptive Residential Wood Deck Construction Guide, or designed by a design professional. Ledger boards may be installed as a means to enhance the sideways stability of the deck but must not be relied on to resist gravity loading.
18Can I install exterior foam insulation on top of R-Sheathing?
No. An additional layer of exterior foam on top of ZIP System R-Sheathing is currently not recommended.
19Can R-Sheathing Be Used on MF and LC Projects?
Yes. The ZIP System R-Sheathing code-recognition report, ESR-3373, recognizes compliance with the 2009, 2012 2015 IBC and IECC. R-Sheathing currently has recognition to \be used as wall bracing or in shear walls under the 2009, 2012 2015 IBC. See ESR-3373 or the ZIP System R-Sheathing Installation Manual for proprietary shear values.