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edjazzer
Registered Users
Posts:2
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| 11/23/2007 1:21 PM |
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I am building a new house and was thinking of using SIPS, but builders and appraisals in area do not help. I am not thinking of using spary foam insulation. My question is, which is better closed or open cell?
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mmacgowa
Registered Users
Posts:542
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| 11/23/2007 8:20 PM |
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from foamtech.com
"The advantages of the closed-cell foam compared to open-cell foam include its strength, higher R-value, and greater resistance to the leakage of air or water vapor. The disadvantage of the closed-cell foam is that it is more dense, requiring more material, and therefore, more expense. Even though it has a better R-value, the cost per R is still higher than open-cell foam. The choice of foam should be based on the requirements for the other characteristics - strength, vapor control, available space, etc." |
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trigem1
Registered Users
Posts:50
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| 11/30/2007 5:39 PM |
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From GrandCountySIPs.com
I might suggest finding a dependable local SIP rep that can supply you with an engineered set of plans that will meet all local and state codes. If you have four or five friends to help, you could easily have all the exterior walls up in a day. If not, a general contractor should be able to supply the labor to do this. Next, find a roofer willing to install the roof panels. Your SIP rep should be able to assist you in this and come to your site to instruct on the correct method of assembly. There are two main types of foam on the market today. EPS (expanded polystyrene), and XPS (extruded polystyrene). EPS panels can come in longer lengths, are wider, lighter, less expensive and easier to handle. XPS panels are thinner, heavier, more expensive, have a maximum of 4 feet wide and are more labor intensive. The short answer to your question is, EPS is less “R” value per inch, but much less expensive, while XPS has a higher “R” value per inch, but is much more expensive. Spray would be expensive, and you would still be faced with the low “R” value wood stud issue, dropping the “Whole Wall R value”.
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