Roof Sheathing, 1/2 Vs 5/8 - Roofing/Siding - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

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

Reply
 
Thread Tools Display Modes
Old 09-14-2012, 07:46 PM   #1
Member
 
Join Date: Sep 2012
Posts: 62
Rewards Points: 75
Default

roof sheathing, 1/2 vs 5/8


Is there any practical benefit from using 5-ply 5/8 ply vs 5-ply 1/2 for roof sheathing? 16" oc 2x10.

I know that 3/4 will add more weight, but my roof structure was engineered to handle a lot more weight than the difference between 1/2 and 3/4.

Plans call for 1/2, but then we decided to go with regular composite shingles rather than the heavier stuff we had speced for (wife found a color of shingle she liked better. And it's half the cost, so i'm not complaining). But since we hadn't sheathed yet, am wondering if there is any benefit for using thicker sheathing. Last longer, more resistant to damage? Or just a waste of money?

Oh, slope is 4.5 per 12, about 21 degrees. Was supposed to be 5/12 but there was a *cough* miscalculation on my part.

California, no snow load here.

Advertisement


Last edited by weekendwarrior9; 09-14-2012 at 07:51 PM.
weekendwarrior9 is offline   Reply With Quote
Old 09-14-2012, 08:03 PM   #2
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,798
Rewards Points: 712
Default

roof sheathing, 1/2 vs 5/8


Waste of money to use 5/8. Just make sure to use H clips between the rafters.
You do know three tabs are not going to last as long, More likly to lose tabs, will be more likly to leak sooner, and just do not look anywhere near as good.

Advertisement

joecaption is online now   Reply With Quote
Old 09-14-2012, 11:41 PM   #3
Member
 
Join Date: Dec 2011
Location: B.C. Canada
Posts: 2,055
Rewards Points: 1,030
Default

roof sheathing, 1/2 vs 5/8


Thicker material will stay straighter, not sag between rafters. But really it don't matter.
mae-ling is offline   Reply With Quote
Old 09-15-2012, 12:19 AM   #4
Registered User
 
Join Date: Mar 2009
Posts: 10,007
Rewards Points: 2,080
Default

roof sheathing, 1/2 vs 5/8


No H- clips required with your 16”o.c. spacing; http://www.strongtie.com/products/co.../pscl-psca.asp
Unless you live where it rains “cats and dogs”…always check with local AHJ. Be sure to space sheathing a 10d all edges. I had to install 3/4" once, house was in take-off/landing path of airport (sound reduction).


Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is online now   Reply With Quote
Old 09-15-2012, 12:49 AM   #5
Member
 
Join Date: Sep 2012
Posts: 62
Rewards Points: 75
Default

roof sheathing, 1/2 vs 5/8


Thanks for replies. I was about to go buy a bunch of H clips, glad I won't need them.

Yeah, 16oc, with blocking at the 4' mark, alternating bays, on a standard gabled roof.

Have 8d 1 1/2" galv roofing nails.

iirc the nailing schedule is what, 6"oc on all edges, 8"oc for field nailing for the ridge, main roof, and rafter tails, then for the gable outriggers, 4"oc edges and 6"oc field? I've heard I should use ring shank on the gables and rafter tails as well.

Silicon Valley, California, no high winds, moderate rains in winter. What's the gap between sheets for, to prevent buckling?

Last edited by weekendwarrior9; 09-15-2012 at 12:57 AM.
weekendwarrior9 is offline   Reply With Quote
Old 09-15-2012, 06:06 AM   #6
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 7,142
Rewards Points: 3,304
Default

roof sheathing, 1/2 vs 5/8


I would still put in the clips. They are super cheap and do help stabilize the joints in decking.

At the end of the day, what is the cost differential between the the two thicknesses? The thicker deck will lay down flatter and stay more true over the long term as compared to the thinner decking. If both are installed properly, it shouldn't make a different either way but if the difference is $200 in lumber charges, I would do it personally.

I would also not use a 3-tab on my roof when dimensionals are that close in cost...if you were planning on that.
Windows on Wash is online now   Reply With Quote
The Following 2 Users Say Thank You to Windows on Wash For This Useful Post:
joecaption (09-15-2012), mae-ling (09-15-2012)
Old 09-15-2012, 11:42 AM   #7
Framing Contractor
 
Join Date: Feb 2009
Location: NE Ohio
Posts: 1,102
Rewards Points: 516
Default

roof sheathing, 1/2 vs 5/8


I wouldn't waste the money using the 5/8. H clips are unnecessary as well. Usually on 16 centers we will use an h clip at each end just to keep the correct spacing. A nail can be used, just remember to pull it out before you trip over it.
sixeightten is offline   Reply With Quote
Old 09-15-2012, 12:54 PM   #8
Bombastic Idiot
 
notmrjohn's Avatar
 
Join Date: Aug 2012
Location: Mesquite, Texas
Posts: 761
Rewards Points: 500
Default

roof sheathing, 1/2 vs 5/8


I use a ring shank or candy coat for entire sheet of sheathing. Use H's their cheap, bit less bounce at seams when nailing shingles. Less bounce with 5/8 than !/2 but with 16" centers probably won't notice. Was re-roofing over old shingles on a house long ago, got a few courses up at one end was getting a lot of bounce couldn't even drive nail. broken rafter? Rotted sheath? Climbed into attic, discover 36" between two rafters. 2X6's Floating joint between next row up of sheathing.
__________________
Measure twice, cut once.
Look at the nail, not the hammer. Watch the fence, not the blade.
If you hook your thumb over your belt you won't hit it with the hammer or leave it layin on the saw table.
notmrjohn is offline   Reply With Quote
Old 09-15-2012, 10:59 PM   #9
Registered User
 
Join Date: Mar 2009
Posts: 10,007
Rewards Points: 2,080
Default

roof sheathing, 1/2 vs 5/8


Hope you went with a light-colored shingle; http://www.professionalroofing.net/a...2/feature2.asp

Under CA Code; #31, and footnote "b": http://publicecodes.cyberregs.com/st..._23_par127.htm

You may be under a special seismic "diaphragm nailing" for your location, hit "next section" to progress through them: http://publicecodes.cyberregs.com/st..._23_par168.htm Full-blocking at eves/ridge/gables. Check with AHJ.

Gap is for sheathing swelling when wet due to night sky radiation; Fig. 5; http://www.buildingscience.com/docum...+sky+radiation

and "solar driven" moisture, Fig. 3b; http://www.buildingscience.com/docum...ofing-shingles

Gary

Advertisement

__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is online now   Reply With Quote
Reply


Thread Tools
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
Roof Sheathing mrus Roofing/Siding 8 04-07-2012 07:59 PM
is my sheathing rotting? *pics* Nospammer Roofing/Siding 24 03-07-2012 10:06 PM
Roof Sheathing Thickness Clutchcargo Building & Construction 8 09-23-2009 02:13 PM
The moving Ice Dams after using a roof rake ?? Canufixit Roofing/Siding 9 02-05-2009 08:33 PM
Rubber Roof and Roof Deck vianak Roofing/Siding 2 10-09-2008 06:37 PM




Top of Page | View New Posts