Insulating a scissor truss
When insulating an unvented scissor truss roof with loose cellulose, ~24" heel height and ~ r-30 spray foam against the underside of the roof decking, can I leave an increasing airspace as I work my way up to the peak? In other words, I want a consistent thickness of cellulose (~18") starting from the raised heel up to the ridge. Can the remaining space between the cellulose and spray foam be a air space or am I risking condensation somewhere in the sandwich? This is assuming air barriers at the roof decking level and bottom chord. BTW: Zone 7-8. Thanks.
Posted Sat, 01/12/2013 - 09:28
Other Questions in Green building techniques
Best practices ideas for retrofitting existing PWF built in muskeg and best practices for foundations for new builds in muskeg (i.e. very wet !) and a severe cold climate