L & T Ventures See More Roof Installation Pictures Famous SIP Built Projects Demmitt Hall 12- 1/4 inch SIP Roof on straw walls. This beautiful community centre was built mostly by volunteers. 12-1/4" SIP roof South Pole Station South Pole Station – constructed with 12-1/4 inch thick SIPs with an R-Value of 52. If they use SIPs at the South Pole doesn’t it make sense to build with SIPs in Canada? Valleyview Shell Super Station Valleyview Alberta, constructed with SIP walls and SIP roof. Friedenstal Hall Friedenstal, Alberta. Post and Beam construction with SIP walls and roof. MacDonalds, Dawson Creek, BC This restaurant is constructed with SIP walls.