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Extending overhangs from 6" to 12" ? 28' Fink trusses from 1976

Extending overhangs from 6" to 12" ? 28' Fink trusses from 1976

(OP)
Hello all, Anyone willing to help a M.E. wanting to extend my two-storey house overhangs by 6 inches? House was built 1976, prints say design was 1969, Chicago area. (The small overhangs just don't look right to me, and the ground water issues are improved with bigger overhangs.) Currently 28' SPF Fink trusses (2x4 top & bottom chords, 2x3 diags) has all of 5 1/4" overhang, with 1x8 pine fascia nailed into end grain at eaves. On gables, a 5 1/4" wide 2x4 ladder lookout is nailed to the studded gable end, again covered with 1-by pine trim. My proposal is to strip the existing trim, sister 24" long 2x4s to the truss topchords, extending them by 6" (with roughly 18" glued and screwed to trusses). On the gables, replace the lookout ladder with 2x4s laid flat, cantilevered out 11 1/4" and extending 24+ inches inside. Thus these would hang from the underside of the gable top "plate" -- but with jack studs under, and sistered to existing gable studs. Then the flat 2x4s extend inside the attic to meet the underside of the nearest truss. Screwed upward into existing top chord. Other details: city says this must have permit. Have contacted 5 roofing companies, can't even get one to bid on the job; hence, I have started this engineering myself. Attached are photos sketches in a PDF file (if I've worked the website correctly). Happy to do my own stress analyses if needed (specially is railroad car fatigue) before going to someone else, or handing this off to a S.E., or taking what I have to the city engineer and seeing what happens. Before that, you experts can improve my thoughts, I'm sure. What suggestions/changes/advice do you have? Thanks one and all, Bill S., P.E.

RE: Extending overhangs from 6" to 12" ? 28' Fink trusses from 1976

This is a non-issue structurally. I wouldn't even bother with the glue. I'd IL stamp the thing for you but we're not allowed to solicit work here.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Extending overhangs from 6" to 12" ? 28' Fink trusses from 1976

Consider adding a 2x behind the fascia on the gable end. As is, it is probably OK. But, I don't like the idea of the fascia supporting even a little bit of roof sheathing.

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