Monday, May 15, 2006

"Green" Structural Components + Tips

SIPs (Structural insulated panels)
OSB sandwiching an insulating foam core. Quick to assemble and provide superb energy performance. SIPs are manufactured in a range of thicknesses providing different R-values. In response to problems with insects burrowing in SIP foam cores, look for products that incorporate borate compounds. SIP buildings can be quickly assembled, particualarly when panels are factory-cut, including door and window openings.

ICFs Insulating Concrete Forms:
Foam insulation formwork for reiniforce concrete walls.These permanent forms stay in place after teh initial pouring of the concrete core, providing insulation, fnish attachment surfaces, and a chase for utilities.

Engineered Lumber:
Utilizes fast-growing, small-diameter trees effeciently.
Plywood sheathing has been replaced by OSB sheathing.

Floors made with engineered lumber joists or with finger jointed or gangnailed trusses, have many advantages in addition to their green attributes. By allowing ductowork and piping to run through them, they encourage the practice of keeping ducts and pipes inside the conditioned envelope.

Increase wall stud spacing to 24” O.C.
Space Floor joists and roof rafters at 24”

Design homes on 2’ modules

Using 2-stud corner framing instead of 3 studs, and replacing 2 and 3 stud backing fro drywall attatchments at wall “T” intersections with inexpensive drywall clips or scrap lumber

Eliminating headers in nonloadbearing walls.

Substitue 2x6 for conventional 2x4 framing. 2x6 framing at 24” oncenter uses roughly the same amount of board-feet of lumber as 2x4 lumber at 16” On-center, while leaving a larger wall cavity for increased insulation levels. Once framing crews have gained experience, these techniques can save money by using fewer pieces and being faster to assemble.

Green Builder. com
Green Building Guidlines
The Green Spec Guide to Residential Building Materials

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