Replies

1. 
   brandonm78 | Sep 26, 2011 01:37pm | #1

   Here is a picture. You can see the joists in the area that I am talking about. The home is located on Camano Island, WA and is in a moderate marine environment.

2. 
   brandonm78 | Sep 26, 2011 01:39pm | #2

   picture

   
3. GBA Editor
   Martin Holladay | Sep 26, 2011 01:41pm | #3

   Sam,
   Q. "I was wondering if you have to vent the underside of an exterior awning that is not a roof and has no insulation in it."

   A. No.

4. 
   wjrobinson | Sep 26, 2011 01:43pm | #4

   Sam, venting roof systems lowers the roof temperature and clears out moisture. Venting a porch something like you describe is not called for by code if I understand your post. Would it help the roofing last longer? A roof shingle manufacturer may know. Low on my list. For low slope roofs here in NY, I like to completely cover my sheathing with ice and water shield or use 30 pound tar paper half lapped instead of a 2" lap. Comes down to budget and type of roof/building/shed or whatever.

   Hope this helps. Basically the answer is no, but venting it if you want to is OK.

5. 
   wjrobinson | Sep 26, 2011 01:45pm | #5

   Beautiful project Sam. Now that I see your roof... I would say hopefully the underside of it is not vented but is permeable so that there is no trapped moisture inside the structure that is not able to dry.