Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Carpentry

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-30-2006, 08:43 PM   #1
Newbie
 
Join Date: May 2006
Posts: 1
Share |
Default

what roof decking material should i use?


I'm building a 2600 square ft heated (3952 total) on one level. The roof has 12-8 pitch and 12-12 pitch. Is it ok to use OSB, or should I use 1" by 8" or plywood. And what are approximate cost differences?

chrisd11 is offline   Reply With Quote
Old 05-30-2006, 09:18 PM   #2
Member
 
robertcdf's Avatar
 
Join Date: Nov 2005
Location: Colorado Springs, Colorado
Posts: 653
Default

what roof decking material should i use?


Around here in Colorado Springs we use OSB almost everywhere.

robertcdf is offline   Reply With Quote
Old 05-31-2006, 01:30 AM   #3
renovations
 
Join Date: Aug 2005
Location: Canada
Posts: 430
Default

what roof decking material should i use?


I assume you are putting asphalt shingles on? Here, too, 7/16" osb is common and runs ~$12, 1/2" ply is common, too and is ~$20. You need to use h-clips between the sheets, and remember, read the package that the shingles come in. For steep slopes you need to put a lot of nails in the shingles. The shingles likely won't be warranted if you put them down on 1"x8". Again, I'm just assuming you're putting shingles down, is this the case?
Bonus is offline   Reply With Quote
Old 05-31-2006, 07:29 AM   #4
Master Craftsman
 
Big Dave's Avatar
 
Join Date: May 2006
Location: Southwest Mo.
Posts: 289
Default

what roof decking material should i use?


Around here we use 1x12 #4 pine or cedar. I hate osb for underlayment because when the sun shines on the roof at the right angle you can count every sheet. Looks tacky.

Dave.
__________________
Do one thing at a time, do it well, then move on.
www.bigdaveswoodworks.com
Big Dave is offline   Reply With Quote
Old 05-31-2006, 07:35 AM   #5
Member
 
Darylh's Avatar
 
Join Date: Jan 2006
Location: Nanoose Bay Vancouver Island BC
Posts: 460
Default

what roof decking material should i use?


I would use 1/2" plywood. It holds nails much better than osb.
Darylh is offline   Reply With Quote
Old 05-31-2006, 09:07 PM   #6
Member
 
robertcdf's Avatar
 
Join Date: Nov 2005
Location: Colorado Springs, Colorado
Posts: 653
Default

what roof decking material should i use?


Quote:
Originally Posted by Big Dave
Around here we use 1x12 #4 pine or cedar. I hate osb for underlayment because when the sun shines on the roof at the right angle you can count every sheet. Looks tacky.

Dave.
I have never seen (or maybe never noticed) that before. Although 90% of the roofs I am looking at would have a high quality shingle. Not sure if that makes a differance. I will try to remeber to look next time.
robertcdf is offline   Reply With Quote
Old 05-31-2006, 10:17 PM   #7
renovations
 
Join Date: Aug 2005
Location: Canada
Posts: 430
Default

what roof decking material should i use?


"Around here we use 1x12 #4 pine or cedar" Hey, Big Dave, you use cedar for underlayment? Stuff must be cheap where you are. It grows here and I couldn't afford to use it for underlayment.

Some shingle mfrs explicitly state on the package that the shingles must not be applied over boards only sheet products, so watch for that.
Bonus is offline   Reply With Quote
Old 05-31-2006, 11:16 PM   #8
Master Craftsman
 
Big Dave's Avatar
 
Join Date: May 2006
Location: Southwest Mo.
Posts: 289
Default

what roof decking material should i use?


Quote:
Originally Posted by robertcdf
I have never seen (or maybe never noticed) that before. Although 90% of the roofs I am looking at would have a high quality shingle. Not sure if that makes a differance. I will try to remeber to look next time.
Your probably right. Now that I think about it I only notice it on cheaper 3 tab shingles.

Quote:
Originally Posted by Bonus
Some shingle mfrs explicitly state on the package that the shingles must not be applied over boards only sheet products, so watch for that.
I have never seen that before but then again i'm not a professional roofer.

Dave.
__________________
Do one thing at a time, do it well, then move on.
www.bigdaveswoodworks.com
Big Dave is offline   Reply With Quote
Old 06-06-2006, 09:19 AM   #9
Member
 
Join Date: Oct 2005
Location: Boston
Posts: 129
Default

what roof decking material should i use?


The loss of lateral bracing should rule out board sheathing on roofs for most houses.

The most critical issue in selection of roof sheathing should be its ability to hold roofing nails. According to the NRCA, for asphalt shingles, using smooth-shank nails, plywood and OSB have similar nail pull-out resistance for similar thicknesses. Using ring-shank nails, OSB has considerably more resistance in spite of popular opinion.
http://www.professionalroofing.net/a....aspx?A_ID=370

OSB and plywood both swell when wet. Plywood actually swells faster than OSB, however, OSB tends to not return to its original condition when dry so it must be carefully protected, especially the cut edges. If you are not willing to treat the cut edges and cover the OSB immediately after installation, you should probably use plywood. Good quality OSB has been getting more water resistant and AdvanTech by Huber is probably the best currently available.

Whatever your preference, I strongly recommend using 19/32", or 5/8", or thicker structural panel sheathing for roofs for its superior nail holding capacity. Using ring-shank nails would be a bonus in high wind areas but it might make reroofing more difficult.

Clips should not be needed for any sheathing 7/16" or thicker on spans of 24" or less, but if they are used, be sure they are the kind that allow for expansion of the panels.

Last edited by mighty anvil; 06-06-2006 at 09:27 AM.
mighty anvil is offline   Reply With Quote
Old 06-18-2006, 09:32 PM   #10
b2v
Newbie
 
Join Date: Jun 2006
Posts: 4
Default

what roof decking material should i use?


Osb On The Cheap. Based On The Size Of The Ranch, You're Not Building A Piece Of Sh!t, So Go With 5/8" Especially If There Is Going To Be Lag Time Until You Have It Roofed. Rain On Osb Would Prove To Quite Destructive.

b2v is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Please help with the design of this roof jaymay75 Building & Construction 1 05-06-2008 09:44 AM
Roof decking MIKEGOUGH1 Building & Construction 3 12-02-2006 04:58 PM
Flat roof - Rolled? - leaks Advice? JJ2001 Roofing/Siding 4 11-19-2006 06:17 AM
Flat Roof Suggestion gladiator Roofing/Siding 3 09-14-2005 03:31 PM
What roofing material is right for me? Grumpy Roofing/Siding 0 07-07-2004 07:41 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.