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I would like some input regarding a non-vented attic space for a project in Orlando, FL.

by LiveModern Webmaster last modified Mar 23, 2012 01:00 AM
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by last modified Mar 22, 2012

I am building a new home with ICF construction and plan to use a non vented attic for my mechanical equipment. I will be using R20 Icynene sprayed directly to the roof deck. 1st question - the roof assembly is 3/4" plywood roof deck with peel + stick waterproofing membrane with a 16" standing seam roof (no exposed mechanical fasteners). I have read many opinions regarding using sleepers to create an air gap between the metal roof and the peel + stick. Is this necessary? 2nd question - I like the idea of using the attic space for the mechanical systems in a semi conditioned space but not venting the attic seems counter intuitive to me. Should the attic be mechanically vented in some way as to create some sort of air movement/exchange? Any moisture issues with open cell non vented attics? Thank you.




 

 

I am building a new home with ICF construction and plan to use a non vented attic for my mechanical equipment. I will be using R20 Icynene sprayed directly to the roof deck. 1st question - the roof assembly is 3/4" plywood roof deck with peel + stick waterproofing membrane with a 16" standing seam roof (no exposed mechanical fasteners). I have read many opinions regarding using sleepers to create an air gap between the metal roof and the peel + stick. Is this necessary? 2nd question - I like the idea of using the attic space for the mechanical systems in a semi conditioned space but not venting the attic seems counter intuitive to me. Should the attic be mechanically vented in some way as to create some sort of air movement/exchange? Any moisture issues with open cell non vented attics? Thank you.

Applying spray foam insulation to the rafters is an excellent way to build for energy efficiency.

  • There is more conditioned space, but the cooling system is not fighting the hotter-than-outside temperature...



 

 

 
 
 

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