unstaggered subfloor plywood
unstaggered subfloor plywood
(OP)
Doing a gut renovation on a 3-story residence and have come across a 3/4" plywood subfloor nailed to the 16" o.c joists, but the plywood is not staggered, nor was there any blocking for end seams. Curious what options are on the table to look at here that don't involve ripping out the subfloor or new staggered overlay.






RE: unstaggered subfloor plywood
Add additional interior shear walls to break up the diaphragms and lower the diaphragm stresses seen.
Mike McCann, PE, SE (WA)
RE: unstaggered subfloor plywood
RE: unstaggered subfloor plywood
Is there any evidence that the existing sub-floor diaphragm is in need of reinforcement, or not performing adequately? A 3/4" sub-floor is already about half again as thick as most of those installed today. I am always a bit floored (pun or not) at the people (background, experience, knowledge) involved in this kind of work. If I needed a heart transplant, I would most certainly want an OBGYN or a Dermatologist to do the operation, never mind a Structural Engineer.
RE: unstaggered subfloor plywood
Mike McCann, PE, SE (WA)
RE: unstaggered subfloor plywood
If it ain't broke don't fix it. Just because it isn't normal to you doesn't mean there is a problem. If it squeaks, deflect or if the edges sag, then you could think about remediation.
RE: unstaggered subfloor plywood
Maine EIT, Civil/Structural.
RE: unstaggered subfloor plywood