I am planning to attach a 1/4 " x 8" x18" steel plate with a 4" hole in centre to 2- 2x8 beam that spann 60" the hole is there for the B-fan pipe, no other way. I just want to give some support to the beam. I did drill 5 holes in the plate on each side of the 4" hole. 2 top 2 bottom and 1 centre. I do have 1/4"x4" galvenized lag bolds.
My question is should I use them or get 3/8" bolds? Also will 4 be enaugh? Reason I use lag bolts is that the other side is not accessible as is.
Thank you for any help.
Yes it means Bathroom Fan. sorry about that.
This is on my second floor bathtroom the beam is on top of a wall with a window 20"x30" that window faces a skylight shaft 5'x4' that goes from the first foor to the roof with a pyramid skylight that is where my fan comes out.the beam is 2 2x8.
I had an inspector look at it he say i am ok as is but putting a steel plate would'n hurt.
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