Minimum Recommended Roof Pitch


  #1  
Old 10-25-16, 04:17 AM
M
Member
Thread Starter
Join Date: Mar 2009
Location: Northern Virginia
Posts: 4,226
Received 22 Votes on 17 Posts
Minimum Recommended Roof Pitch

I'm designing a small attached addition and would like to know what the minimum recommended roof pitch is. I have a section that extends nine feet out and has a rise of two feet. Is this sufficient for a northern virginia climate where winter storms can drop as much as two feet of snow? It doesn't happen often, but it does happen every few years. Also, is a 2'x4' skylight okay to have on such a gradual slope?
 
  #2  
Old 10-25-16, 05:24 AM
P
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 27,675
Received 1,460 Votes on 1,314 Posts
There is no minimum pitch. A roof and/or skylight can be flat. It just depends on how it's constructed.
 
  #3  
Old 10-25-16, 05:34 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 49,051
Received 600 Votes on 533 Posts
.... and what type of roofing material is used.
 
  #4  
Old 10-25-16, 06:17 AM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 10,531
Received 42 Votes on 38 Posts
Basically, that's a flat roof with a little extra pitch, so in that line of thinking, yes it can be done. But as PD and Mark said, the how and what are the issues.

Will this be attaching to the roof or a side wall?

Bud
 
  #5  
Old 10-25-16, 09:15 AM
M
Member
Thread Starter
Join Date: Mar 2009
Location: Northern Virginia
Posts: 4,226
Received 22 Votes on 17 Posts
It will be attaching to a side wall. Wood rafters/sheathing and asphalt shingles. What I was getting at was in the winter, there will up to two feet of snow resting on top for weeks at a time, so my concern is water infiltration and/or structural integrity.
 
  #6  
Old 10-25-16, 10:14 AM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 28,982
Received 1,447 Votes on 1,303 Posts
The minimum slope for asphalt shingles is 2:12. Anything from 2:12 - 4:12 is considered "low slope" and you will need to follow the mfg's instructions pertaining to underlayment carefully. Many guys will cover low slope roofs with ice and water to prevent potential leaks... even that must be lapped more than normal on a low slope roof.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: