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Attic Trusses
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Posted by daniele4618 (My Page) on Thu, Feb 5, 09 at 12:50
| This might be a stupid question. What are Attic Trusses? |
Follow-Up Postings:
RE: Attic Trusses
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They are the same as roof trusses . It is the lumber that you use to frame your
roof . The trusses sit on the walls , are covered with sheathing and then get shingled . |
RE: Attic Trusses
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| Attic trusses are as Faymarie states, roof trusses. The difference is that they are engineered with a heavier bottom chords for heavier loads when used as a living space. The advantage of them is that they are open in the mid section so that they can be easier used for storage or for living space. They dont have the common inner webbing that a standard truss has but are engineered to be as structurally sound concerning live loads mentioned, as well as snow load requirements in your area. |
attic
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Here is a link that might be useful: attic trusses
RE: Attic Trusses
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| Our roof was stick-built. The cost of that vs pre-formed trusses was a wash and it was my understanding that we'd have more useable space without the trusses. That so? What's the difference between stick-buily and 'attic' trusses? (Our 'attic' is full height and can be a second story with the addition of some dormers.) |
RE: Attic Trusses
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| the difference is the difference between trusses vs. stick built. Functionally both will keep up the roof and allow you to use whatever space the design allows you to use. Keep in mind that attic trusses may be designed only for storage, not for "live" loads. Depends on the design of the stick-built area as to whether it can handle live loads. |
RE: Attic Trusses
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There are many ways to design a truss to provide load and span capabilities.
The Fink truss (inner cords look like a large W) is very common for attics.
It is very efficient in producing acceptable strength with minimum materiel.
The down side is it does not allow any open space. Other truss designs can be used to produce open space, at an increase in the amount of material compared to a Fink truss. A stick framed roof can provide a wide open space, but takes much more material to construct (larger boards).
The amount of material increases again if the attic floor of a stick built roof is designed to carry loads. |
RE: Attic Trusses
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| Attic trusses have live load calcs regardless of use. That's why it's important to know well beforehand what the use is going to be. Too often a planned attic storage, after it is seen when framed up, folks want to change the space to an office, crafts room, or other living space in which it might not be engineered for. It can still be done, just more involved than if it was in the works before framing/engineering. It's one of those areas that should be figured overkill rather than the engineering/code minimums. |
RE: Attic Trusses
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| We are building in Southwest Louisiana where does not snow do i still need attice trusses?? |
RE: Attic Trusses
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| Snow has nothing to do with trusses or stick built, it is just another load that must be considered in either case. |
RE: Attic Trusses
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| Thanks. I didn't *think* I'd misunderstood why we didn't use trusses but 'attic truss' wasn't a term I'd heard before. We wanted to live on one floor but have our full height attic available for another owner to add another 3-4000 sq ft. |
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