With a visit to our talented timber frame architect, Andrea, we successfully further refined the drawings. We also decided with her that the entire building (the main timber frame as well as the wings off it) would be constructed with SIPs—structural insulated panels. We had always planned on using SIPs on the roof and the timber frame walls. Using SIPs in the remainder, however, facilitates the transition between construction methods.
|A stack of SIPs|
A SIP looks like a big ice cream sandwich—generally 4 feet by 12 feet or 8 feet by 12 feet—with two pieces or oriented strand board (OSB) on either side of a core of 10 inches of expanded polystyrene (EPS) foam to deliver a structural ceiling panel with a whopping R value of 40. (Higher R values, higher insulating qualities.) In comparison, a traditional ceiling joist constructed with two by tens insulated with fiberglass would yield an R value of 30.
|Custom machined router blades|