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9/30/2011 4:02:11 PM
Inspected a house built with this product and the nails were flush with face of the 1" foam . the manufacture stated that this would be ok but the nail would need to be tight to rigid board to achieve max shear values. Do not think this is installed correctly, any thoughts. The nail shank was 3/4" away from the ridig board that allows this product to be use as shear panels, It is applied directly to the studs on the exterior of the home.
9/30/2011 7:28:20 PM
If it isn'l installed in compliance with manufactures requirements (installation instructions; then it should be failed at inspection.
"STYROFOAM SIS™ Brand Structural Insulated Sheathing combines structural lateral bracing, insulation and water-resistive barrier properties in one solution."
This catch-all chemical construction material is a big mistake; and the homebuy is going to pay for the failures. This stuff is made of toxic chemicals, glue, wood chips and styrofoam; is not stable; is not installed correctly in most cases; and most inspectors have no idea what they are looking at; and, many inspection departments do not inspect exterior sheathing installation to insure it is installed per mfg instructions.
Retired Texas Combination Inspector. Location Oklahoma.
10/3/2011 10:16:12 AM
As I stated the manufacture has approved the installation , but my concern was how much shear value was lost due to the nails not being tight. I think the building designer should approve the installation.
Here is what the manufacture stated about the nails not being tight to the strucural member of the sheathing.
I spoke with my Industry Specialist regarding your question about nailing requirements with STYROFOAM™ SIS. He said it is not a requirement for the nail to be flush with the structural board. The nail should penetrate the foam layer. It should also penetrate the Stud at least 1 inch. The closer the nail is to the structural member, the stronger it will be however. Here is a statement from our ANSWER CENTER regarding nailing requirements.
"If nails are used to install STYROFOAM SIS™ Brand Structural Insulated Sheathing, use a nail with a minimum shank diameter of 0.113". Plastic caps should not be used in conjunction with nails when installing STYROFOAM SIS™ Brand Structural Insulated Sheathing. The plastic cap would limit the depth by which the nail could penetrate through the foam layer. To maximize the strength of the STYROFOAM SIS™ Brand Structural Insulated Sheathing panel, the head of the nail should penetrate into the foam and be close to the exterior side of the structural member. By contrast, countersinking staples is not required; however, it is acceptable." http://dow-styrofoam.custhelp.com/app/answers/detail/a_id/10634/kw/nail
This link has some information on this as well. http://building.dow.com/na/en/sis/installations/sis-wood.htm
Customer Information Group Dow Building Solutions The Dow Chemical Company www.dow.com
This information is considered accurate and reliable as of the date appearing above and is presented in good faith. Because use conditions and applicable laws may differ from one location to another and may change with time, Recipient is responsible for determining whether the information in this document is appropriate for recipient’s use. Since Dow has no control over how this information may ultimately be used, all liability is expressly disclaimed and Dow assumes no obligation or liability therefore. No warranty, express or implied, is given nor is freedom from any patent owned by The Dow Chemical Company or others to be inferred.
™Trademark of The Dow Chemical Company
10/3/2011 10:31:51 AM
I looked up AC269, ICC-ES Reports; and there was no match for that number;
"Meets IBC/IRC requirements for foam plastic insulation. See ICC-ES AC269." from the link you provided.
From your answer from Dow; they don't want to accept any responsibility. However, if the installation does not meet the requirements of the installation instructions; I, personally would fail it; and, most likely be overruled by my superior. At least my part as an inspector would be completed.
Most AHJs accept a letter from the "design professional" as you indicated.
10/4/2011 10:30:48 AM
Stryrofoam SIS was tested and approved to ICC-ES standards as a structural sheathing. This claim and all others are substanciated in ICC-ESR 2436. The product was tested with fasteners installed both flush to the surface and countersunk into the foam layer and pass the ICC-ES criteria both ways. Therefore, either installation method is approved and this is clearly stated in the product literature and on every sheet of the product in graphic form.
The following statement about the product is wreckless and false and will be reported as abuse.
Dean DeWildt, PE
Dow Building Solutions
10/4/2011 12:33:09 PM
Welcome to the forum.
I stand corrected on one item; it is not "wood chips and glue"; it is "fiberous sheathing board" (don't know what materials this is made from). What chemicals/glues are used in the "firerous sheathing board"?
You really should go out and see how your product is installed in the real world.
I'm sure you are a valued and loyal employee of Dow Chemical; however, I wish you would explain to me what part of my statement you quoted is incorrect; and what part constitutes "abuse"?
10/4/2011 2:27:24 PM
You are quite right the ESR 2436 does state that the "nails may be counter sunk" past the surface .
This means the nails do not have to be counter sunk, after re-reading the instructions only screws in metal studs need to be tight to the structural member.
I assumed the nails had to be tight to the structural board and it was ok to counter sink nails into the foam without damage to the product as shown on the product.
Thanks for clearing things up for us, products new to us are always hard for an inspector.