20 Jan '12, 6pm

Different SIP thicknesses, different shell types, windows..... #green

Working on a fun home that will get some solar gains and pretty simple design. We plan to make it future PV adaptable when the costs drop some. Looking at a few wall design concepts. Owner is really liking SIPs. I have nothing against SIPs, I think they are a great product. We have a plant within a couple hours that produces urethane panels so a lot higher r then the eps ones. Ships costs are next to nothing so more cost savings. The 4" panel is approximately an r26 they claim while the 6" is about r42. My thought was to use the r42 panel, but now we are looking at the costs vs energy use to see if this is the right way to go or not. Running some numbers in my program, the 4" panel would make the heat load about 19k btu. THe 6" would drop it to about 17,500 btu. What this means for the current electric rate is a yearly savings of about $40. The cost differece is just under...

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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