Hole in wood diaphram
Hole in wood diaphram
(OP)
On a remodel job I recently did the engineering on the homeowner has added a dormer to the existing roof cutting two 2'x4' openings in the roof. The holes are separated by one 2' bay. The dormer was not shown on the plans. Normally I would strap around openings like this. The homeowner already has the roof on. The dormer is lager than the openings. I hate to have him remove a portion of the roofing and possibly part of the dormer to install straps. Then again, I really don't want to provide the stamped detail requested by the inspector. What do you normally do in similar situations? Is there a code exception allowing some minimum opening I am not aware of. I guess I should just do the full analysis to determine the loads around the openings. Thoughts.....






RE: Hole in wood diaphram
BA
RE: Hole in wood diaphram
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Hole in wood diaphram
BAretired - That is a good point. I think your right it should be analyzed as a 6'x4' opening.
msquared - I was surprised the inspector was requiring engineering sign-off on something like this. Unfortunately he is.
IMO this is a situation where technically straps should be installed. However, the chances of this ever causing a problem is very, very unlikely. So now I am in the position of causing him extra expense to cover my a** (and potentially paying for my time/work)for what???
One part of me says it isn't my fault, he could have consulted me before doing the work. The other part says if it was my house and money I wouldn't be removing roofing to install straps.
RE: Hole in wood diaphram
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Hole in wood diaphram
RE: Hole in wood diaphram
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Hole in wood diaphram
Not sure about your need for straps on the upper surface of the roof. Why can't you do things from underneath?
RE: Hole in wood diaphram
I provided a detail without requiring removing roofing to install straps.