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mountnrebl
Re-enforce roof trusses?
mountnrebl

I have a old house ( built in 1909) and I'm curious about re-enforcing the roof. It is made of 2X4 rafters with a single 2X4 cross beam crossing every third or so rafter. The rafters meet in a "V" and are simply nailed together. Obviously it's been without issue's for 100 years, and typically I am a big fan of not fixing what isn't broke. I am concerned about earthquakes (live in Portland, OR). Would adding nail plates and cross beams to every rafter be wise? Should I just leave it be?

-Jared

ed21
Re: Re-enforce roof trusses?
ed21

While it sounds like the rafters wouldn't meet current codes, I would agree don't fix what ain't broke. Unless you see a problem that needs correcting, I wouldn't bother.
Earthquakes are less likely to affect the roof than high winds or snow loading.
If earthquakes are a issue, be sure any wall mounted items, bookshelves, tv's are secured so they can't fall.

A. Spruce
Re: Re-enforce roof trusses?
A. Spruce

Don't fix what isn't broken. The likelihood that you'll ever have a quake at all, let alone one big enough to do damage is practically zero for your area.

Mastercarpentry
Re: Re-enforce roof trusses?
Mastercarpentry

I'd plan on addressing it during the next re-roof. Demo the roof sheathing, sister for strength, tie in with 'hurricane clips" etc, then cover up. Easy to get to that way and if it's been there that long already it will likely be OK till you need that new roof. If you see a structural problem before then a quicker plan may be in order- just keep an eye on it.

Phil

dj1
Re: Re-enforce roof trusses?
dj1

Hurricane ties and other seismic ties from Simpson Strong Tie are the ones to get. They are required on all new construction around here and recommended for old construction. But in Oregon? find out from your building dept, and if required/recommended, the dept will have the details.

After the 1994 quake, everyone was wondering why certain homes sustained major damages and many others in the same areas, haven't. Proper bracing? ties? could be.

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