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Thread: Attic Trusses
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08-02-2009, 09:09 PM #1
If your attic truss area is a bonus room, whether living space or just storage, the actual framing for the attic trusses will depend on the planned floor loading, if different than code requirements, and the spans of the framing members. The depths of the individual bottom chord members will be dependent on those specifications. I have seen some truss manufacturers build the floor components of the attic trusses like "floor trusses" and with single 2x members (e.g., 2 x 10's or 2 x 12's). So, depending on the detail you plan to show in your construction drawings, you may want to get your truss manufacturer to provide that information to eliminate any guess work on your part.
Curt Johnson
X5
Puget Systems Custom Computer, Win 7 Pro 64-bit SP1, 3.3Ghz Intel Core i5 2500K Quad, 8 GB Kingston DDR3-1333 Ram, Intel X25-M 80 GB SSD App Drive, WD 500 GB Caviar Blue SATA 6 Gb/s Data Drive, EVGA GeForce GTX 550 Ti 1024MB VC, Antec 650W PS, Asus p8P67 Pro REV 3.0 Motherboard
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08-03-2009, 03:01 AM #2
Teaman, is there a checkbox in the "create roof" section of HDP for " ignore second floor"?
Also, read this thread, there are some detailed instructions in it. http://www.chieftalk.com/showthread....344#post106344
Let me know if you have problems.
I don't use HDP, but the program may be similar enough to X2 that I can help you.Leslie Sapp
State Certified General Contractor
State Certified Roofing Contractor
Trenton, Fl.
Ver. X5 Build15.2.0.87x64
http://www.lesliesapp.com
homes@lesliesapp.com
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08-03-2009, 03:18 PM #3Registered User Promoted
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Leslie, yes I can tell HDP to ignore the 2nd floor. My plan since the garage isn't that wide was to put 4' stub walls above the 2nd floor and build somewhat of a sissors truss to make the ceiling. My pitch is 8 in 12 and width of the garage is 26' so I'll have to get the roof up a bit on stub walls to make a reasonable room. I guess I wasn't planning on attic trusses for this room, they worked well on teh 40' wide workshop, but here the room will be too small.
If I create a roof and ignore the 2nd floor, will it give me trouble in the garage where I want to put the stub walls and build the roof over them?
Am I on the right track?
TeaMan
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08-03-2009, 03:48 PM #4
remember floor A can't have rooms defined
LewLew Buttery
Castle Golden Design - "We make dreams visible"
Lockport, NY
716-434-5051
www.castlegoldendesign.com
lbuttery at castlegoldendesign.com
CHIEF X5 (started with v9.5)
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08-03-2009, 04:19 PM #5Registered User Promoted
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What do you mean Lew? If I don't create a second floor for the whole house, I can't create a second floor above the garage?
TeaMan
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08-03-2009, 04:35 PM #6
Yes, you can have floor 2 in one area and not another
I was just reminding that floor A can't have rooms defined
LewLew Buttery
Castle Golden Design - "We make dreams visible"
Lockport, NY
716-434-5051
www.castlegoldendesign.com
lbuttery at castlegoldendesign.com
CHIEF X5 (started with v9.5)
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08-03-2009, 06:11 PM #7
Try creating a second floor for the garage, with your ceiling height on that floor set to the height of your stub walls. Don't check "ignore second floor". It sounds like what you are trying to do is not an attic truss, but a scissor truss sitting on a short wall.
Leslie Sapp
State Certified General Contractor
State Certified Roofing Contractor
Trenton, Fl.
Ver. X5 Build15.2.0.87x64
http://www.lesliesapp.com
homes@lesliesapp.com
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08-03-2009, 06:42 PM #8
use the create floor tool and instead of "create floor same as floor1" select "create blank floor" and then draw the walls over the garage as needed
or "create floor same as floor 1" and then delete unneeded walls
LewLew Buttery
Castle Golden Design - "We make dreams visible"
Lockport, NY
716-434-5051
www.castlegoldendesign.com
lbuttery at castlegoldendesign.com
CHIEF X5 (started with v9.5)
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08-04-2009, 02:13 AM #9
You need to use Ceiling planes at a lower pitch under the main roof.
.........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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08-05-2009, 04:33 PM #10Registered User Promoted
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Allen, would that be for the area where the ceiling plane is the same angle as the roof plane, ie between the stub wall and the flat ceiling? I would guess for more insulation value?
TeaMan
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08-05-2009, 04:51 PM #11
I think if you consult with your truss manufacturer, he could design and build your attic trusses such that the sloped part of the attic truss could have extra depth or thickness for insulation where the knee walls (actually your attic truss verticals would be the knee walls) connect with the trusses. If you don't want a portion of the ceiling to be flat (i.e., scissor or parallel chord), then you'll need to define those elements for the truss guy and I am sure he'll squawk if what you want to do would be difficult to build trusses for. So, set your ceiling planes up how you think you will want them and then rebuild an attic truss and see what it looks like ... then shoot it to your truss guy and see what he says.
Curt Johnson
X5
Puget Systems Custom Computer, Win 7 Pro 64-bit SP1, 3.3Ghz Intel Core i5 2500K Quad, 8 GB Kingston DDR3-1333 Ram, Intel X25-M 80 GB SSD App Drive, WD 500 GB Caviar Blue SATA 6 Gb/s Data Drive, EVGA GeForce GTX 550 Ti 1024MB VC, Antec 650W PS, Asus p8P67 Pro REV 3.0 Motherboard
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08-05-2009, 06:07 PM #12
Here's a quicky I did to show how an attic truss would look with a scissor ceiling. The roof is 10:12; the ceiling 7:12. The roof planes were generated from the first floor but probably should have been built from the 2nd floor. Chief will build the truss but, without a flat ceiling and floor system (see warning), it will not generate an "attic truss" per se. When I built the 2nd floor I gave it a 2' ceiling height. Also, I deliberately made the bottom chord of the truss to be a 2 x 12 in the truss tab of the framing dbx. As I said before, I think a truss builder could build a truss like this. I could have made the sloped ceiling planes parallel with the roof planes ... and probably use a flat ceiling with this option ... depending on the truss guy, maybe just parallel the roof planes to a peak similar to the vaulted ceiling I am showing. I think there is a minimum amount of depth that they can make parallel chord trusses with, depending on spans and snow loads. You'd have to check on that.
Curt Johnson
X5
Puget Systems Custom Computer, Win 7 Pro 64-bit SP1, 3.3Ghz Intel Core i5 2500K Quad, 8 GB Kingston DDR3-1333 Ram, Intel X25-M 80 GB SSD App Drive, WD 500 GB Caviar Blue SATA 6 Gb/s Data Drive, EVGA GeForce GTX 550 Ti 1024MB VC, Antec 650W PS, Asus p8P67 Pro REV 3.0 Motherboard
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08-06-2009, 02:14 AM #13
Wouldn't it be better just stick framing it?
If you're going to have a floor already...........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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08-06-2009, 02:03 PM #14Registered User Promoted
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Thanks Curtis. That looks like a great Idea. I'll give it a try. Funny you would suggest that I speak to my truss manufacturer. I just hung up with him before I read your reply. He is looking at how he can do just what you suggested. I didn't think I could replicate it on my software, but you proved I can, so I will try. I'll be nice to get some dimensions so I can see if I need to go to a steeper pitch.
Alan, If I can do this with attic trusses, I won't have to put floor trusses above the garage and the cost will be considerably cheaper than going that route. My only concern is insulation, but if I use closed cell foam, I can get a good insulation value.
TeaMan
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08-06-2009, 05:44 AM #15
Allen:
Trusses can be made to carry wider spans without center supports. I changed the bottom chord to simulate a deeper bottom chord which I am sure a truss manufacturer would use to carry any required floor loads for the "attic" or "bonus" room.
Yes, it could be manually framed but a center support might be required depending on spans and planned floor loads. Totally up to the designer and/or home owner.Curt Johnson
X5
Puget Systems Custom Computer, Win 7 Pro 64-bit SP1, 3.3Ghz Intel Core i5 2500K Quad, 8 GB Kingston DDR3-1333 Ram, Intel X25-M 80 GB SSD App Drive, WD 500 GB Caviar Blue SATA 6 Gb/s Data Drive, EVGA GeForce GTX 550 Ti 1024MB VC, Antec 650W PS, Asus p8P67 Pro REV 3.0 Motherboard