size of lag bolds

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Posted by: from Saint Leonard
6/14/2012 at 10:05:14 PM


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.

size of lag bolds
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Spencer from All Home Repair in St Thomas
Date/Time6/15/2012 at 1:08:53 AM

Hmmm I'm not sure what you are trying to do here. Is B fan mean bathroom fan?



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Matt in Saint Leonard
Date/Time6/15/2012 at 9:22:38 AM

Hi Spencer

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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