Treated Wood Nailer On Structural Steel
Treated Wood Nailer On Structural Steel
(OP)
I have a steel beam with a wood 2x nailer to allow roof truss attachment. The nailer must be fire treated. How do you prevent the corrosion of structural steel? Are there any products out there that isolate the steel from the treated wood?






RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
RE: Treated Wood Nailer On Structural Steel
JAE's suggestion is good for separating the lumber from the beam top flange and archeng59's concern about the threaded rods is valid.
RE: Treated Wood Nailer On Structural Steel
I'm not aware of any gasket material that will serve this purpose.
Thanks Schwartz, I'll look into the treatment chemicals.
RE: Treated Wood Nailer On Structural Steel
Can I use felt, building paper, housewrap or similar materials as barriers to prevent corrosion?
No. These materials may not effectively separate the dissimilar metals in the wood and in the metal components. They offer NO protection at the key potential corrosion sites where fasteners penetrate the barrier.
It's for CCA and protecting metal deck, but it's the same idea.
RE: Treated Wood Nailer On Structural Steel
I have to side with structuralaggie on this one. Don't mix wood when everything else is steel. I have been providing connection details for the light gauge truss industry for the past 4 years and I always hated seeing a wood nailer being spec'd out on top of steel beams and masonry walls in the contract drawings.
Using a wood nailer creates a problem of what fasteners, more importantly, how many fasteners to use for attachment. The norm is #10 screws with some type of light gauge bent plate. #10 screws have very low pull-out values in wood. The truss connections will be dictated by the uplift value on the trusses anyway.
Try using some type of HSS spacers, 1-1/4" steel plate, or build up a light gauge metal spacer. You will use fewer fasteners and not have to worry about the interaction between the fire treated wood and the steel.
Don't let the contractor bully you on this. If you don't want to use wood, tell him no. It's your building design.
RE: Treated Wood Nailer On Structural Steel
Simpson recommends Grace Vycor Deck Protector membrane to seperate their metal connectors from pressure treated lumber with ACQ or CA treatment( Simpson Technical Bulletin T-PTBARRIER05). You might inquiry from Grace weather this material would also provide a barrier to fire treatment chemicals.
RE: Treated Wood Nailer On Structural Steel