3/10/2024 0 Comments Rafter ties in roof of old homeSo, if I installed rafter ties, they would need to be higher than 1/3, maybe more like 2/5 the distance up from wall plate to ridge. At exactly 1/3 the way up, the rafter ties would be only 6'1" from the floor. Unfortunately, this isn't practical because the ceiling isn't tall enough for adequate head room. I would like to strengthen this structure.Īdding rafter ties probably would help a lot, but I understand that rafter ties should be located within the lower third of the distance between the wall plate and the roof ridge. Also, one end of the ridge is about two inches below the other end. The corner of one side of the roof sags a bit (but this might be due to warped roofing material). There are no ceiling joists/rafter ties at all. The rafters are joined at their miters with what I think are called mending plates (very lightweight things). I have a 12x12 outbuilding with no ridge board. Would a rafter tie located somewhere in the middle third of the distance between the wall plate and roof ridge serve any significant structural function? YMMV, there are always exceptions, never say never. The two are similar but a collar tie is IMO aways up higher and helps some with wall spread but mostly with stopping ridge sag. For example, on a 10,000 reroof, if you can’t tie down all the trusses for 1,500 or less, you. Because the outside roof corners get the most stress during high winds, the code requires those locations to be addressed first. Maybe thats a angle to look into ?īTW collar ties connect to rafters, joist sit on wall plates and /or ledgers. Homeowners don’t have to spend more than 15 of the total cost of a reroof job on upgrading roof-wall connections. Could be those rafters where code when the place was built. Span charts have been changed over the years as new wood isn't as good. Generally if it's existing and your not doing "to much" ( ya whats to much, ever building dept / inspector will have a different opinion on that) existing slight over spans in older buildings are allowed, not always, but the local inspector going to be the only one who can say, "Ya it's OK." Or his boss the local building offical.įor what it's worth a 1' 6" over span on a other wise well built building as in 16 " OC framing, 1/2" or better sheet good or 3/4 " real boards, etc. involved you need to ask them what they want you to do, or if they being public servants WHO you are in a way paying, think taxes, and they will not help you will have to hire a engineer, or maybe a architect / designer in your area, to design what your looking for / need to do. With all the weird screen names we use it sometimes gets blurry as to who's who and whats what. They like the idea of a vaulted ceiling but not the expense of the new structural ridge it would require. My clients have a garage with a conventionally framed 4/12 roof that they want to convert to living space. Rak it is sort of hard to keep every ones "job" sorted out. Rafter Ties and Shallow-Pitch Roofs By Jordan Truesdell Login or Register to download the PDF version of this article. An inspector probably wouldn't care for it but it ought to be strong enough. That would triangulate the structure very nicely. Top plate to 2/3 of the way up the opposing rafter, joined in the middle. If there is no code and it has held up for some years, but you just want to reinforce it some I'd be inclined to do some kind of scissors rafter ties. If the powers that be want this to meet current code you will need to work with them. Almost certainly would need a structural engineer to sign off on that one. The other would be to use the existing rafter as the top chord of some built in place truss. A doubled 2x8 might satisfy them or a 2x10. One would be to "sister" the existing rafters. If the existing rafters are too small and you need to satisfy an inspector I can only see two solutions. Neither would substantially change the ability of the rafters to bear a 60 psf load. Ceiling joists that attach to the top plates & rafters & span the building do the best job of tying the walls together. Rafter ties, collar ties, whatever stiffen the roof structure a bit and help resist the outward forces that the roof exerts on the walls. I've never seen a roof spread at the peak except in a total failure, think hurricane or tornado. I hope PEG rides in to the rescue here 'cause I'm confused.
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