I am building a house with a hip roof truss system designed by the manufacturer. The living room and foyer are cathedral trusses that run from north to south with a hip at both ends. The other trusses run from east to west with hips at both ends and the roof line is higher than the cathedral trusses. How do I connect all of this or where can I find a book or technical information on how to complete this?
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Porkchop,
Manufacturers of truss roof systems cannot design roofs independent of fastenings, since fastenings are as critical a factor when determining loading as is material dimensioning.
I'm sure you will be receiving detailed instructions on how you WILL attach all members in order for the roof system to meet loading requirements.
The problem I've found is that the assembling sequence required to get the fastening methods accomplished (according to the engineering specifications) -on complicated roofs at least-- rarely follows logical framing sequence.
Therefore, I believe you would be prudent to get your fastening and assembly package from the truss manufacturer as soon as possible (before the arrival of the parts if possible). I also would not schedule a crane until after all parts have been inspected, a plan has been formed, and all your rigging is ready.
Clampman
Thank you. I will contact the truss company first thing in the morning. One last question: Most books on roof framing do not include conventional framing with manufactured truss systems, know of any good roof framing books which combines old and new techniques??
Porkchop,
Sorry, I don't know of any. Maybe some other guys out there do however.
clampman
I'm not sure I'm clear on what you're asking. Are you asking about connecting the trusses to each other? Like hanging the hip end on the girders? Or are you asking about erection bracing? Or maybe you're talking about overframing?
A sketch or picture would go a long way.........
If it's overframing you're wondering about, ask the truss company if they did a layout for your house. If they did, they might be able to do some rough 3D views to show you what the finished product will look like.
If you're asking about erection bracing, I have some stuff I can post.
I'd be glad to try to help, but have to know what you're asking about first.
Never do card tricks for the group you play poker with.
Overframing. It is hard to explain in words but the east and west roof line is higher than the cathedral trusses that run north to south.
The truss company can't help with overframing too much - It's not really their responsability. You might ask them about the 3D views I mentioned, though.
Even the layout they give you can help some. Ask them to highlight the areas that will need to be overframed.
How far along are you on this? Can you maybe play with the pitches or something to reduce the amount of overframing? Or maybe cantilever the trusses in the center out over a porch or something.
Again, a sketch or picture would help, if you have the ability to post it here.
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