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jim stock
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Posts:1
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| 10/30/2000 3:07 PM |
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We're architects in the Detroit area working on a custom home in Maryland and very new to the sip concept. The house is 30' wide by 84' long. Originally, the house was to have steel trusses @ 12' o.c. vertically (columns) and horizontally (roof trusses) for the structure with 2x6 or 2x8 wood purlins spaning perpendicular in direction @ 24" o.c. The roof is a 3/12 pitch shed configuration with corrugated metal rofing. The owner loved the look of the steel trusses and the repetive nature of the purlins and we would like to retain that look. However, the wall and roof constructions became so complicated with trying to provide a cold roof etc. that we began looking at other "systems". We would like to employ the use of sips for the roof and wall constructions.
Questions:
1. On the low side of the roof, the wall is canted out of vertical by 7deg. and we would like to "hang" the panels so that there is a horizontal "reveal" top and bottom the length of the home. We would either infill at the reveal or use a thinner panel. Does this make sense wanting to nail into the horizontal purlins out of plumb? Can we rely on the panels to provide some bracing?
2. We would like to overhang these panels at each end of the house by approx. 4' Is this a possibility? We also realize that the purlins would have to extend out to support the panels since they would now be spanning in the direction of the steel trusses.
3. Do we need a cold roof design when we are using corrugated metal roofing and not asphalt shingles?
any help would be appreciated, thanks
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BillArchtx
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Posts:24
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| 10/31/2000 11:21 AM |
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Jim -
All those things are possible with SIPs - and better built with SIPs than anything else I can imagine. They are also cost-effective - which may or may not be a concern. Like everything else in architecture: it's in the details! Start some drawings and let's see what you have, again, each manufacturer has their own engineering guidelines. Pick one, stay with him and make it work. Some of us "independents" have learned how to engineer these things and may be available for consultation.
The roofing is the easiest part.
Again, stay with it! And do all your homework.
Best,
Bill Chaleff
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Steve Andrews
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Posts:334
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| 11/01/2000 12:31 PM |
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Jim, a word of caution: steel trusses are susceptible to major thermal bridges in standard residential applications. Unless there is a considerable about of foam sheathing beneath those trusses in a conventional roof application, my field experience tells me they can cause "ghost lines"--a "dirty" look caused by the very large temperature difference between the steel truss and adjacent ceiling cavities/spaces. (However, your post indicates the steel trusses might be exposed? I was unclear on that point. If that's true, the above concern may not be a factor.)
It sounds as if a representative for a SIP manufacturer needs to see your plans to fully understand your request. You might check the SIP Directory on this website for manufacturers fairly near your Maryland site, then contact several to get your questions answered. Alternatively, you could send preliminary concepts to someone like Bill Chaleff (the architect who responded above) for some quick engineering and design consultation.
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