We have a restoration contract on a nursing home with gypsum decking over steel truss work. The insurance company has ever so gracefully, sent out a scope paying for absolutely nothing but 1 layer of 20s off and on and some pipe jacks using the wrong price list missing every accessory and the 2nd layer among everything listed below.
Here is what I Know
The roof currently has 2 layers of 25 year fiberglass shingles nailed directly (1.75" galv nails) to the gypsum boards, no felt or wood anywhere but the owner of the building seems to think there is some sort of membrane under the original layer of shingles that cant be damaged during the tear off.
They have also stated that the manufacture of the gypsum product is no longer in business and they have used elevator shaft fireboards to replace a section of the sheathing on the roof before. I could not find any sort of name in the attic or from above of the product but I do have an email in requesting how they knew what it was to know they were out of business.
We removed some shingles today and saw nothing membrane related, just the 2 layers of shingles.
The tenants/insured’s, whom are triple net leasing the structure, have said that it was built (in 1985) with no wood to avoid needing attic sprinklers and all the drama that comes along with them and that no wood can be attached to the structure because they will then be required to have said sprinklers installed. I have a call into the building systems engineer they referred me to in order to clarify all of this but have not heard anything back
CertainTeed as well the makers of every brand of gypsum board that I could currently find installation instructions for online call for wood sheathing to be installed to the gypsum in order for the shingles to be warranted and installed correctly, obviously if this is done it brings up the sprinkler issue if it is an issue.
I guess what I’m looking for is any type of info anyone that has done one of these has to offer.
Is there a sheathing option that is not wood based that is acceptable to the shingle manufacturer?
Has anyone dealt with Guide One insurance and were you able to supplement for code upgrades?
Does anyone know if the sprinkler rule is accurate (NC)?
Any other advise? Its only an 880 sq job and with all this drama id rather just keep plugging along on my regular residential stuff if it gets too dramatic but the salespeople will definitely be pissed, they have been on mental vacation since the day the contract was signed on it