Roof Sheathing - 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 04-02-2012, 07:44 PM   #1
Newbie
 
Join Date: Apr 2012
Posts: 1
Rewards Points: 10
Default

Roof Sheathing


I have a question about a project I started and has turned into a logistical disaster.

Was planning on replacing my shingles. Two days to tear them off and put titanium paper down then 2 days to put the shingles on. Ran into big trouble. Seems all the boards are bad. All of them. 24 square. They are 3/8 inch plywood that appear to be fried. The glue is totally fried and they just peel apart and are very gummy. A ridge vent was later cut into the boards, I assume when the shingles were put on in 1998.

My question is this. Could those boards have gone bad with a roof vent and lots of vented soffit in 14 years? The person I bought the home from a year ago stated they replaced the roof in the sellers disclosures in 1998. Are they lying? I think so. It seems to me these are the original boards that they later cut the vent into, you can see the circular saw marks in the joists at the peak, and not new boards.

Could those boards have gone that bad in 14 years under new shingles with tar paper and ice & weather guard on them and a ride vent and soffit? You can peel the boards right apart and they are as spongy as a trampoline if you don't go right through them.

Advertisement

mrus is offline   Reply With Quote
Old 04-02-2012, 09:46 PM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 7,093
Rewards Points: 3,244
Default

Roof Sheathing


Very possible.

Bad batch of glue at the plywood factory will do it.

3/8ths is not ideal for a roof deck in my opinion too.

Advertisement

Windows on Wash is online now   Reply With Quote
Old 04-02-2012, 10:57 PM   #3
Metal Roofing
 
Join Date: Jan 2012
Location: Mission Viejo, CA
Posts: 539
Rewards Points: 552
Default

Roof Sheathing


3/8ths would make for a very spongey deck even after the new shingles are installed. We dont even offer 3/8ths, in my neck of the woods 1/2" is minimum.

It is never fun to tear off and see massive amounts of wood damage, no one likes to hear they need hundereds to thousands of dollars additional work
AndyWRS is offline   Reply With Quote
Old 04-02-2012, 11:03 PM   #4
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,732
Rewards Points: 580
Default

Roof Sheathing


The only time I've ever even seen 3/8 used on a roof is in a cheap mobile home.
Should have been a minimum of 1/2" with H clips between the rafters to keep it from sagging.
joecaption is online now   Reply With Quote
Old 04-05-2012, 03:52 PM   #5
Member
 
Join Date: Feb 2012
Location: Utica, NY
Posts: 533
Rewards Points: 528
Default

Roof Sheathing


Joe, back in the early 60's when plywood was first being used, 3/8's was common. Now we want more.
framer52 is offline   Reply With Quote
Old 04-06-2012, 08:10 AM   #6
Roofing Contractor
 
Join Date: Feb 2011
Location: Stillwater, MN 55082
Posts: 92
Rewards Points: 75
Default

Roof Sheathing


Is it interior grade plywood? Seen this on a few roof decks, not good!

Everybody seems to things plywood is better than osb but I see a lot more issues with plywood roofs than osb roofs. You would think if plywood was really better they would make siding out of it! Example/ LP Smartside osb based...
dougger222 is offline   Reply With Quote
The Following User Says Thank You to dougger222 For This Useful Post:
MJW (04-06-2012)
Old 04-06-2012, 09:15 AM   #7
Member
 
Join Date: Jul 2010
Posts: 142
Rewards Points: 83
Default

Roof Sheathing


Just because they replaced the roof doesn't mean they replaced the sheathing. And 3/8 ply or 7/16 OSB is minimum code, and contractors will take the pocket dollars over more expensive and stronger lumber.

But I did re-roof some townhomes that had to have 30% of the 3/8 plywood sheathing replaced, and they were only 17 yrs old from new.
But they had no venting what so ever.
bcdemon is offline   Reply With Quote
Old 04-07-2012, 01:05 AM   #8
Member
 
Join Date: Jan 2012
Location: Pacific North west
Posts: 1,311
Rewards Points: 626
Default

Roof Sheathing


Half inch min on the sheeting! Plus sheeting could have been bad when they put in the vents and just felt what the hell we going to sell this home so who care's. I would replace the sheething with 1/2 in CDX plywood min of five plys.
Nailbags is offline   Reply With Quote
Old 04-07-2012, 07:59 PM   #9
Pro
 
JetSwet's Avatar
 
Join Date: Jan 2012
Location: Lagrangeville NY
Posts: 1,008
Rewards Points: 502
Default

Roof Sheathing


Just did a roof job today, right off the bat I knew it was old 3/8" cdx cuz of the spungyness but about 8 sheets had to be replaced with the same 3/8" because they were delaminated. I can say that most of the house on that coldisack were probable 3/8" used back in that day, I didn't think either that anything less then 1/2" would be used but we are talking late 60s easly 70s.

Advertisement

JetSwet 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
is my sheathing rotting? *pics* Nospammer Roofing/Siding 24 03-07-2012 10:06 PM
Tying new roof into old. Clutchcargo Roofing/Siding 15 11-07-2009 06:48 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