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Dana Veach

Summilux...your sun room is one of my all time favorite rooms on Houzz...I've saved it to several idea books! Your ceiling is similar to what my sister and I would like to do in our small cabin. We have to deal with venting issues, however and are unsure how to approach this. Do you have any suggestions? (We now have a combination of eave vents/ridge vent running the length of the cabin.) We can tear off the existing metal roof, (which we are having to do anyway to add on room for bathroom/laundry/pantry space...) put down planking over the existing trusses, then replace the radiant barrier, decking, and roofing. Should I broach this problem on a Houzz advice forum, or do you have a ready solution? Thanks so much!

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summilux

Hi Dana- glad to hear from you and to see you are making progress on your cabin. I don't know what the temperature range is where you have your cabin. The wider the temperature range, the more important venting becomes. My sunroom's venting requirements are modest given that it is an unheated space and the PNW temp range is pretty moderate. The principle is to have a space where the exterior temperatures do not meet acutely with a markedly different interior temperature. Roofs with trusses have that space ready made and loose insulation provides the gradient. You will need a good roofer to give you the appropriate venting for your location, ceiling hgt and insulation. Beware solid panel insulation is expensive.

@ phoebe3- thx for your comments. When I did the first version of this roof in '95, B&S let me use 2 inch panel thickness as it was going to be an unheated space. In 2012 as part of an overall roof replacement, another 4 inches of solid panel insulation was added. The car decking T&G boards are 1.5thick. The plywood over the insulation was 3/4" and there were strip of wood to provide airspace b/w the insulation and the plywood. The fascia boards on exterior trim are 8" wide. Here are some photos.



Hope that helps. As above mentioned solid panel insulation is much more expensive than prefab trusses with attic space for sheet roll insulation aided by airspace to provide ventilation as discussed above.


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phoebe3

Thanks, summilux! Your information and images are really helpful! Much appreciated!

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