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Old 01-26-2013, 02:33 AM   #7396
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Gulf Island Building.


The top end of the truss will have a built up section of solid lumber in order that it may sit on the front wall of the house, which is currently expected to be a 2 x 6 wall. There's no need for any guesswork with this design, it will snuggle right in to the edge of the wall.

On the real McCoy, there will be three pieces of 2x lumber used.
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Old 01-26-2013, 02:35 AM   #7397
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The top end of the truss is cut away to allow for fall and winter sun to penetrate the clerestory windows, but be shaded in the summer.
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Old 01-26-2013, 02:37 AM   #7398
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The bottom end of the truss will be supported by the inner wall, unlike most double wall designs. This shortens up the net span that the truss covers, thus increasing the load bearing capacity.

The arrow shows the part that sits on the inner wall (if it worked, that is!)
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Old 01-26-2013, 02:38 AM   #7399
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Gulf Island Building.


Here's a better view of the curve I was speaking of earlier. No load this time.
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Old 01-26-2013, 02:41 AM   #7400
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Pretty foggy here this morning before the sun burned it off. There was a dragger hauling in his catch about 500 yards away. Plenty of gulls along for the free lunch!

A bit later, the wind had drifted him in front of my place, by which time he had the nets in and they were cleaning the fish.
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Old 01-26-2013, 03:02 AM   #7401
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OK...a few numbers on the truss.

The net span (between the two supporting walls) will be 14' 8 1/2".

The height of the real truss will be 16 1/2", which will allow three layers of R-22 Roxul to fit at 5 1/2" per layer.

The 56 pound weight on the model translates to 3,584 lbs. on the real thing.

The trusses will be on a 24" center to center spacing, which means each one will cover a net area of 29.4 square feet. This, therefore, equals a load of 121.8 lbs. per square foot.

No consideration has been given for the added stiffness which will be provided by the outer roof skin (5/8" T&G plywood, or the inner skin (7/16" OSB.) Since snow loads would not be expected to exceed 60 lbs. per square foot, there is a safety factor of at least 4 in this roof design.

Added to that is the fact that the closer you get to the support walls, the less the load becomes on the truss itself. It actually reaches zero as it arrives at the edge of the wall support, at which point the load is transferred 100% through the wall structure.

The main point of this deep roof truss was that it carry a high insulation value. The Roxul is R-66, and except for where there is no thermal break, that is the real R-value. Each truss has just slightly over one square foot of wood reaching from top to bottom, thus reducing the R-value at that point. In order to minimize any thermal bridging, a 1" layer of foil faced foam board will be installed between the top of the trusses and the roof skin.

OK, fire away...
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Old 01-26-2013, 08:42 AM   #7402
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What type of glue and fasteners are you going to use? Will the plywood you use on the real trusses be heavier than what you have now or will it stay the same. It looks to me like it would need to increase but I am not that up on the engineering end. What kind of blocking will you use to close off the space between the trusses on top of the walls? Just a thought, would it be stronger if the ends of the plywood lapped a little more or does it make any difference.

Do you build like I use to, a stud dead under each rafter/joist? When I built you could stand in front of the house and every stud in the house would line up, no guessing where the studs started in a wall, they were all the same.

That is a really neat truss Keith, you are right, I have never seen one like that but it is really interesting, I love new things. Not being critical, just a little brain storming buddy.
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Old 01-26-2013, 12:30 PM   #7403
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What type of glue and fasteners are you going to use? Will the plywood you use on the real trusses be heavier than what you have now or will it stay the same. It looks to me like it would need to increase but I am not that up on the engineering end. What kind of blocking will you use to close off the space between the trusses on top of the walls? Just a thought, would it be stronger if the ends of the plywood lapped a little more or does it make any difference.

Do you build like I use to, a stud dead under each rafter/joist? When I built you could stand in front of the house and every stud in the house would line up, no guessing where the studs started in a wall, they were all the same.

That is a really neat truss Keith, you are right, I have never seen one like that but it is really interesting, I love new things. Not being critical, just a little brain storming buddy.
Jim: I will be using OSB for the trusses, just like I did on the house here. The I joist manufacturers also use OSB. You need the grain to be vertical, which gives greater strength and stiffness to the truss. The plywood I used on the model is just about 1/4 scale, which is why it looks thin.

Glue will be construction glue with ring nails.

The blocking is a regular 2 x 4. The overlap only needs to be the thickness of a 2 x 4, or 1 1/2". Glued and nailed in place.

There is no need to close off the spaces between the truss ends on the inner wall, that gets filled with insulation, while the outer wall rises higher, and will indeed be closed off.

Absolutely the studs and trusses will line up. Transferring all that potential weight to the ground needs to be done in a direct line.
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Old 01-26-2013, 12:44 PM   #7404
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Jim: I will be using OSB for the trusses, just like I did on the house here. The I joist manufacturers also use OSB. You need the grain to be vertical, which gives greater strength and stiffness to the truss. The plywood I used on the model is just about 1/4 scale, which is why it looks thin.

Glue will be construction glue with ring nails.

The blocking is a regular 2 x 4. The overlap only needs to be the thickness of a 2 x 4, or 1 1/2". Glued and nailed in place.

There is no need to close off the spaces between the truss ends on the inner wall, that gets filled with insulation, while the outer wall rises higher, and will indeed be closed off.

Absolutely the studs and trusses will line up. Transferring all that potential weight to the ground needs to be done in a direct line.
I can't wait until you start building your new house, that is going to be really neat. Buddy, I believe in the ring shank nails, I have used them many times before and they really have some heavy duty holding power. Is this your design of the trusses? That is really first class.
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Old 01-26-2013, 06:33 PM   #7405
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Is this your design of the trusses? That is really first class.
Yes it is.

Now we just have to come up with a catchy name for it. Don't worry...I wouldn't try to patent such a design, I believe it belongs in the public domain. That way anyone can use it to achieve a highly insulated roof at low cost.

The materials cost (locally) runs about $26 - $28 for the materials for one truss, at retail prices.

Considering that you are building the upper and lower roof overhangs as well, I think this is a very reasonable and eminently practical way to build.

I would make a simple jig setup on a 24' long bench, so that once the first truss was built it could be duplicated rapidly. Hmmmm, maybe there is a market for cabin kits all pre-cut...???
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Old 02-05-2013, 06:55 PM   #7406
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Just saying hi.

Actually, had to bump the thread, since it isn't on the first page, and that won't do.
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Old 02-07-2013, 02:45 PM   #7407
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Now we just have to come up with a catchy name for it.
I think that truss would be called a "Ruxton Truss". Seems appropriate.
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Old 02-07-2013, 03:00 PM   #7408
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Last week I had my six-month doctors appointment and as always after our visit the doctor sent me to his lab to have blood drawn. The same lab technician has been drawing my blood for a few years now and she's a sweetheart.

When it was my turn this sweetheart lab tech says; "Bud have a seat in the chair and we'll get started". "By the way this is Sharon one of our new lab techs and she'll be drawing your blood today".

So I sat in the chair with two big chair arms appropriate for such procedures. I was wearing a long sleeved shirt and "Sharon" was at her computer immediately across the isle busily inputting my information.

As I began to roll up my shirt sleeves I asked Sharon which armed she preferred and her response was that she wanted to use the arm with the veins in it. At that I respond; "Both arms have veins where did you go to school?" Sharon immediately answered; "Right here in town".

At that point I was hearing snickers coming from across the room. It was the old reliable "sweetheart lab tech" laughing at our (Sharon's and my) verbal exchange. About that time Sharon wised up and realized I was joking with her. Sharon was kind of a starched-lab-coat up until that time.

By now two of the three patients that were also waiting for lab work had begun laughing. At that point Sharon decided to remind us all that SHE was the one with the needles.

So I shut up.............
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Old 02-07-2013, 05:27 PM   #7409
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Quote:
Originally Posted by Bud Cline View Post
Last week I had my six-month doctors appointment and as always after our visit the doctor sent me to his lab to have blood drawn. The same lab technician has been drawing my blood for a few years now and she's a sweetheart.

When it was my turn this sweetheart lab tech says; "Bud have a seat in the chair and we'll get started". "By the way this is Sharon one of our new lab techs and she'll be drawing your blood today".

So I sat in the chair with two big chair arms appropriate for such procedures. I was wearing a long sleeved shirt and "Sharon" was at her computer immediately across the isle busily inputting my information.

As I began to roll up my shirt sleeves I asked Sharon which armed she preferred and her response was that she wanted to use the arm with the veins in it. At that I respond; "Both arms have veins where did you go to school?" Sharon immediately answered; "Right here in town".

At that point I was hearing snickers coming from across the room. It was the old reliable "sweetheart lab tech" laughing at our (Sharon's and my) verbal exchange. About that time Sharon wised up and realized I was joking with her. Sharon was kind of a starched-lab-coat up until that time.

By now two of the three patients that were also waiting for lab work had begun laughing. At that point Sharon decided to remind us all that SHE was the one with the needles.

So I shut up.............
At least she wasn't like ole sarge over at the VA. Man that woman loves to hurt folks. You can see the vein right there in plain sight and what does she do, goes in the side of the arm and work the needle back down to the vein. You know push a little this way then push a little that way kinda zig zag, man you just want to slap her but you just sit there and smile so you don't tick her off.
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Old 02-25-2013, 10:23 AM   #7410
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Keith have you been working your butt off some more? Is that why there are no new posts on here?.......Anyways hope all is going well and look forward to seeing what else you are up to. Take care..

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