Roof decking

06-26-2009, 08:42 AM	#1
rick32 Member   Join Date: Aug 2006 Posts: 78	Roof decking I'm replacing the roof on the back of my house and need to know how thick the decking should be. The roof is 24' wide and 16' long with a 12-2 pitch. The rafters are 2x6 -16 oc. Theres a lot of standing snow on this in the winter. Also, Would metal roofing be a better choice or wouldn't it make a difference?

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06-26-2009, 07:59 PM	#2
Scuba_Dave Xtreme DIY'r   Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248	Roof decking I go with 3/4" sheathing myself on the house On my shed I went with 1/2"

06-26-2009, 10:44 PM	#3
rick32 Member   Join Date: Aug 2006 Posts: 78	Roof decking Thanks for the reply Dave

06-26-2009, 11:03 PM	#4
Scuba_Dave Xtreme DIY'r   Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248	Roof decking Is it a 12-2 pitch? or a 2-12 pitch ? There is a difference 2 in 12 is 2" up for every 12" of run (low slope roof) 12-2 is 12" up for every 2" of run - like an A-frame ski house ? I think based on your measurements it s 2-12, not an A-frame

06-27-2009, 04:20 AM	#5
Ed the Roofer Super Moderator   Join Date: Jan 2007 Posts: 2,384	Roof decking If it is a Low Slope roof, with a 2" Rise for every 12" of Run, then a flat roof material is what that is typically designed for, but a proper sheet metal panel roof specification could work also. The underlayment water-tightness and the flashing details will be critical though. Ed __________________ Stay Tuned For Our New Informative And Helpful Web Site, Coming Soon To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

06-27-2009, 08:37 PM	#6
rick32 Member   Join Date: Aug 2006 Posts: 78	Roof decking Thanks Ed. On another note, my sisterinlaw has 3 dormers that vent her attic. She wants to replace the vent slats with windows and refinish the attic into living space. If we insulate everything and seal it off, dose she still need vents? We live in southwestern NY.