Structural Insulated Panels (SIPs). these 12″ thick foam (EPS-Expanded Polystyrene) panels are sheathed on two sides with 1/2″ thick OSB (Oriented Strand Board) and represent the building shell for the house. when assembled, these 48″ wide panels will form the walls and roof for the house (unheated garage is conventional framing). the R-value for these panels is R48 (compared to R19 for a typical 2×6 wall with fiberglass insulation). SIPs are structural. in other words, they hold themselves up as well as the roof above with only additional structure required at point loads (i.e.: beams, etc.).
claimed SIPs benefits (from manufacturer’s literature) include:
- wood facings are from rapidly renewable wood species.
- EPS does not include CFCs, HFCs or HCFCs.
- minimizes the use of traditional lumber.
- EPS is fully recyclable.
- waste is minimized by providing factory fabrication of complete building package.
once we’ve completed our assault on the learning curve, we expect the house will go up fast. holes for windows and doors are pre-cut. as mentioned in the last post, the windows and exterior doors have arrived, ready for installation when the SIPs have been erected and a roof is in place. so, we expect (hope?) that in about a month we should have box that resembles a house!
this SIPs thing is a new method for myself and gary nichols (builder). so, will be an interesting comparison to our more familiar territory of conventional framing with cavity insulation and rigid foam applied to the “exterior”. installation commences on thursday. so, keep an eye out for the next post – SIPs 2. therein, i hope to be reporting on the efficiencies of SIPs erection!
Kel House of House & Sun, Inc. from Brooksville, Maine is the supplier – www.houseandsuninc.com/207.326.4017. Branch River Plastics, Inc. of Smithfield R.I. is the manufacturer/fabricator – www.branchriver.com.