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Truss Design inquiry

mrbill55

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Greenville, SC
Now that MrBill's garage is in the dry:

I was noticing the unique design of the roof trusses (24" on center, walls are framed 16" on center), centers are typical framing, but I can't say I've ever seen a double bottom cord, almost folded back on one another like an open scissor before. Has anyone uses these for their garage build? Anyone know the reason why they are designed this way?

trusses1.jpg
trusses2.jpg
trusses3.jpg
trusses4.jpg
trusses5.jpg
 
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larry4406

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Hard to understand what you are pointing out.

I think I would be spraying some moldicide on the black truss areas.

I fail to understand why trusses come moldy that way.
 

WNYflyer

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Lockport, NY
Looks like the top piece is used to transfer perpendicular wind forces on the wall that gather at the top plate to the roof diaphragm. Wind on the wall gets transferred to the truss bottom chord and immediately transferred to the top piece which in turn transfers the force to the top chord/roof diaphragm. At least that is my thoughts without seeing the entire design package.
 

Uncle murph

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Harford county
Now that MrBill's garage is in the dry:

I was noticing the unique design of the roof trusses (24" on center, walls are framed 16" on center), centers are typical framing, but I can't say I've ever seen a double bottom cord, almost folded back on one another like an open scissor before. Has anyone uses these for their garage build? Anyone know the reason why they are designed this way?

trusses1.jpg
trusses2.jpg
trusses3.jpg
trusses4.jpg
trusses5.jpg
I believe there’s a raised heel to allow for R-30 insulation.Code in some parts.
 
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billconner

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Thousand Islands NYS
I believe there’s a raised heel to allow for R-30 insulation.Code in some parts.
Agree. I'm converting a building without raised heel trusses and am angling the ceiling at the edges to be parallel and about 20" from the insulation baffles. 11'-6" floor to truss now. (living space, not garage/shop) With cellulose hope to achieve R60+.
 
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mrbill55

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Mrbill- I see that you're a 'neighbor'. We're up near North Greenville University. I designed and built my own house here, on 9 acres of woods.
This is house #6 for us in the last 38 years, our current one down the road from the new one. We spent several months in and outside the house putting our thoughts together, and our plans on paper. While we did the landscaping ourselves, and some of the interior demolition, we are farming out the actual build out to a competent company. They have most everyone in house, so getting the plans drawn up, items picked, and everything laid out the way we want it, so far, besides weather delays, has been pretty painless. Still some minor changes/decisions being made, more to replace what is not up to spec (follow the garage build thread), and then upgrade items along the way we did not think about beforehand. Once done, it will be our "Forever home", which is what we thought the one we have been in for the past ten years was, and we were done......So much for that idea.

Bill S.
 

RPH

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The only “Forever” home you will have is after death. Until then enjoy the life and keep hunting for that perfect spot.
 

Innovate1

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The extra piece almost parallel to the bottom cord is a brace for the raised heel vertical piece. Often for raised heel the lower cord extends out until it contacts the upper cord which would provide similar bracing to keep the vertical piece at the wall from tipping over. But it looks like your lower cord is lower than the bottom end of the upper cord so they had to do it that way. That's due to the height of the raised heel and the fairly low slope of 5/12.
 
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mrbill55

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The only “Forever” home you will have is after death. Until then enjoy the life and keep hunting for that perfect spot.
That is a little off topic, and depressing for this thread asking for information on the trusses, don't you think?

The extra piece almost parallel to the bottom cord is a brace for the raised heel vertical piece. Often for raised heel the lower cord extends out until it contacts the upper cord which would provide similar bracing to keep the vertical piece at the wall from tipping over. But it looks like your lower cord is lower than the bottom end of the upper cord so they had to do it that way. That's due to the height of the raised heel and the fairly low slope of 5/12.
Thanks, much appreciated, mid wall stiffeners/cross bracing was installed yesterday morning, wall to truss stiffeners, anti lift brackets as well. Just a bit higher a quality than what code requires. Better to have the extra engineering built in and not need it, then to need it and not have it. For a little extra labor hours, and a few hundred dollars of bits and pieces, my piece of mind is that much better. Same goes for the house remodel as a whole. Builder is not arguing, but has told me some of what I want will now be incorporated into their future builds as standard. I've always thought outside the box, from a worse case scenario, so as to be prepared for whatever we can be. Heavy snow (yes, it can happen here in SC), strong winds (our house 2 miles down the road has experienced 82mph gusts, per the neighbors weather station just behind us), heavy rain (if you live in the south, you get used to a 2" down-burst, lasting less then an hour, then the sun coming back out).......The clips for the wall to roof are actually used for earthquakes in such areas, but we consider them stiffeners here......Could we experience an earthquake, we have, but all have been less than 2.0's and 40-100+ miles away. No worry about flooding, we are at the top of our small mountain, with only two houses higher in elevation, and several hundred feet higher than the nearest stream or river.

Bill S.
 

RPH

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RPH said:
The only “Forever” home you will have is after death. Until then enjoy the life and keep hunting for that perfect spot.
Ok, maybe you took it wrong. But I do have friends that sound very much like you. They have had several final homes. After the chase, the work, and living in it for awhile it starts again. It’s the hunt and the work that they enjoy. You strike me as that type of person. You enjoy doing this and I encourage you. I’ve seen some dumps turned to castles but there always seem to be another soon after.
Wish you best of luck in your endeavors.
 
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mrbill55

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RPH said:
The only “Forever” home you will have is after death. Until then enjoy the life and keep hunting for that perfect spot.
Ok, maybe you took it wrong. But I do have friends that sound very much like you. They have had several final homes. After the chase, the work, and living in it for awhile it starts again. It’s the hunt and the work that they enjoy. You strike me as that type of person. You enjoy doing this and I encourage you. I’ve seen some dumps turned to castles but there always seem to be another soon after.
Wish you best of luck in your endeavors.
It appears as if every 6-8 years we have moved, the first 4 were for business reasons, the 5th, we spent a year traveling the east coast as empty nesters, 7-10 days a month in search of our next place to live and eventually retire. We actually tried retirement 10 years ago when we got here, but after 2 years, we both chose to go back to work, but for others, instead of ourselves. The new (old) house was something we were not even looking for, saw a sign for an estate sale, on our way out for our morning walk, then breakfast, and for the first time in eons, made the opposite turn and followed the signs. Bought a dining room set, and while I was making my 7 trips back and forth to move it, left my wife to guard the rest of the set (I had people making offers on it while I was disassembling and move bits and pieces, including one asking if my tool box was for sale), then wandered it again when I came back. We saw the potential of the house, and me being so shy and introverted (not in the least on either account), asked the auctioneer what were the plans for the house, excepting the usual "it is sold already, or family is taking it over" response. When we found out the house was going for auction later in January, we asked about doing a pre purchase inspection as we might be interested. Three weeks before the auction was supposed to occur, we got a call asking how serious we were about the property, and did we want to make an offer, as the owner was not doing well, and the family did not want the property to be stuck in probate. A few hours of negotiations, and 4 days later we closed on the house. Right place, right time, and nothing else in this case. Benefit to us, sure, we did not want to bid against the other 28-29 folks that were already signed up for the auction. Good price for us, and the sellers family, plus we already knew what it was going to need, and of course, being us, we went above and beyond that when laying out the groundwork of wants and needs. Seeing the work starting, and the exterior framing moving along so quickly, has us excited. Being able to share the experience here is a plus for us, and those that may contemplate such a project. Do I still question our sanity, sure, every day we are there, which i almost every day I'm watering, or walking the neighborhood (a 1.1 mile loop for each lap). Usually 5-7 days a week Sometimes twice a day.

Hopefully this gives you a decent idea of our mindset going into this new adventure for us.


Bill S.
 
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