But if it were a simple 18x24 gable roof, the framing would probably have: So I can't give specific advice on this situation. What I will say is that if done today, the 2x4 rafters could only span about 6' to 8' and the purlins and struts would be minimum 2x4.Īs I said before the framing is confusing, it looks like there's no end support for hip rafters or opposing king rafters, roof planes changing slope without ridge beams, etc. Be prepared to be hammered by others on the size and spacing of the 2x10s.Ĭlick to expand.That era of attic I've come across 1x's, 2x's, and even T&G flooring used for bracing - hey, whatever's laying around! So if you are able to deduce and want to replace knotty/add back in what was removed at some point, by using the same dimensional lumber, that's your call. You would need new calculations and they would probably come up short, especially considering dead load of storage. Besides, with all the competing roof slopes, multiple hip rafters tying in at various places of a ridge board, errant struts, etc I can not figure this roof out and honestly it's a hodge podge of framing.Įven with upsizing to 2x10 ceiling joists, I wouldn't want to change the structure to a compression design by relying on these 2x10s to support the roof. So think of this framing as sort of a truss. ![]() Although it seems a bit light on how many struts there are, they had the midpoint rafter purlin and there probably was an "L" purlin (binder) across the top of the 2x4 ceiling joists that the king post(s) tied to (as it was helping hold them up). My thought is with the 2x4 rafters, I would want to keep the struts as designed for tension (a la king post). More pictures, aha! Roof purlins, not shimming, and plywood sheathing! I better get thicker reading glasses or increase the brightness of my screen! I've taken some more photos of the system that's in place and would welcome any more thoughts or questions. When I place any pressure on the 1圆 and 1x8 struts that join the 2x4 to the ridge beam and rafters they don't seem to be supporting much if any load and are not under tension (possibly because I removed the stuff that had been resting on the 2x4 ceiling joists). The question is can I replace them/re-route them to the new 'stronger' 2x10 joists that I put in? So I think that they are original to the framing of the original roof. It was build in 1955 with redwood lumber - and these struts seem of the same age and are also present in other houses (same model/same subdivision). The roof still seems solid - no visible sag from the exterior or even looking at the interior framing. They should never have had anything up there at all on a 2x4 spanning 18'! The previous owners had placed some plywood across the 'joists' and used them for storage - so all three that had storage on them (and supports to the roof) had similar sag to them. Three of the 4 2x4 ceiling joists have some sort of rafter strut/support on them. ![]() They are toe nailed into the top plate (not to a rafter). There were only 4 (2x4) rafter ties/ceiling joists spaced about 6 feet apart for the 24 foot run spanning the 18 foot wide garage.
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