Saw this garage yesterday.
For the life of me, I can’t see where the “webs” are doing anything of any significance, and I’m thinking the “builder” (probably the HO given the other screwed up details in the garage) has seen some real trusses and figured any old angled piece will help.
Any comments?
The key to forgiving others is to quit focusing on what they did to you, and start focusing on what God did for you. Max Lucado
Replies
Yikes! a ton of faith in nails I guess.
depending on snow loading tho' it may be ok..just reeks of hack to me.
Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations.
The ties and rafters are sized for their function and this area, the "king post" adds some support, I suppose, but for the life of me I can't figure out what the angled "webs" could possibly contribute.I think BH has the practical answer - it'll limit storage attempts.I should have taken a shot of the other end where the HO had built a 4' x 4' platform in the middle, starting at the exterior wall on the top plate and running it out to the first tie ... and had it loaded with 3 layers of storage boxes which looked like they were full of paper!The key to forgiving others is to quit focusing on what they did to you, and start focusing on what God did for you. Max Lucado
Sojourners: Christians for Justice and Peace
Nothing particularly wrong with that, if wind/snow load isn't a major concern. The angled pieces don't do much good, but the verticals keep the rafter ties from sagging in the middle. (Especially useful given the garage door hanging from the horizontals.) The real question would be how well the ends of the horizontals are tied to the rafters, and whether there's a sufficient thrust beam to carry the load of the untied rafters.
I could certainly be wrong, and wouldn't do it myself without engineering, but it looks ok to me. I don't think this is trying to be a truss. The horizontal members are collar ties, 4' on center, which is normal spacing around here. The angled members are probably just there to keep the collar tie from sagging (though the single vertical member would probably have worked just fine).
MERC.
If nothing else, it will help limit how much stuff the HO can stack up there.
(-:
thats a typical garage around here, no snow load, no storage load. They are hundreds like that around here.
Judging by the fact that these are every second one, they're really more like hangers for the ceiling than anything else. And very nice they are, too.
Roof has a ridge board ,it's not a truss. Kingpost in center is okay, helps take sag out of ceiling joists. The short angled pieces don't do any good, they would if they were at 90 degrees to the rafter,unnecessary anyhow.
mike
The garage of the house I grew up in (built by my Dad) had the same configuration. 2x6 collar ties spanning 24' with a king post in the center. Used for light storage.
I wouldn't build that myself but that garage never fell down.
Jon Blakemore
TRUSSES???? These are not considered trusses. Any one with a couple of hours of building experience could dream these up.
It looks like a conventional system with a 'collar tie' here and there with the odd 'sway strut' thrown in.
It may be ok for some weather, but you want to hope it don't SNOW too much.
but a truss.....no way!
That's why I put the word in quotes. I thought it was a pretty funny picture.I think the "builder" saw some trusses somewhere and figured boards at any old angle would do something.
As a home inspector, I have to keep from laughing out loud when I see stuff like this - it can create the wrong impression with the buyers{G}
The key to forgiving others is to quit focusing on what they did to you, and start focusing on what God did for you. Max Lucado
Sojourners: Christians for Justice and Peace
Edited 11/24/2004 7:04 pm ET by Bob Walker
As I understand it from old structures classes the king post trusses are almost always the worse possible way to go. Often weaker than a simple rafters and joist job. They concentrate a vertical point load on the horizontal bottom cord exactly where it is weakest, the middle of the span.Compare this to a 'W' truss where a diagonal goes from the peak to the 1/3rd point of the bottom cord and another from half the length of the what would be a rafter down to the meet the first diagonal at the 1/3rd point.This causes the stress at the peak to put the center 1/3rd of the bottom cord in tension, a favorable aspect. The load at the center of the rafter length, a weak point in classic rafters gets transferred to down to the bottom cord and partially counters the tension in the center 1/3rd and places the outer third, exterior wall to 1/3rd point on the bottom cord in tension. That doesn't mean the bottom cord, rafter, isn't acting as a beam. Just not like a simple beam like the king post arrangement.Of course all these things act in concert and as theoretically stable triangular structures with pinned joints that are, in fact, semi-rigid. As an instructor told us even the engineers just get an approximation of what is going on as they are applying theory, based on some fairly unrealistic assumptions, to a real-world situation using real-world materials. Any errors being covered by a healthy safety margin.Used to drive me nuts chasing the stresses around even a fairly simple truss. Never could get the complete hang of it. With practice I could regularly get close to what was considered to be the 'right' answer given a particular method of calculation. Good thing us electricians don't need it much.