double layer decking

gusco1 · 03-09-2008, 06:45 PM

i want to redo my roof with architectural shingles. the decking is 3/8 thick. would it be o.k. to install 7/16 o.s.b. over it ?do i use clips?

**Ed the Roofer** · 03-09-2008, 08:42 PM

NO!

You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years.

In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place.

I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it.

Do it right to save the expense of having to re-do it again for alot more money.

Ed

gusco1 · 03-09-2008, 08:50 PM

[quote=Ed the Roofer;105946]NO!

You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years.

In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place.

I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it.

Do it right to save the expense of having to re-do it again for alot more money.

gusco1 · 03-09-2008, 08:51 PM

o.k. thats not what i wanted to hear. so what do you recommend for decking for 2x4"s on 24" centers?

**Ed the Roofer** · 03-09-2008, 09:23 PM

Some of the codes around the towns I work in allow 1/2", but if you go that route, use the 4-ply instead of the 3-ply. For a few buck more, upgrade to 5/8" or 3/4" and the deck won't bounce at all, especially at 24" oc.

Ed

03-09-2008, 06:45 PM	#1
gusco1 Newbie Join Date: Mar 2008 Location: VA. BEACH, VA. Posts: 9	double layer decking i want to redo my roof with architectural shingles. the decking is 3/8 thick. would it be o.k. to install 7/16 o.s.b. over it ?do i use clips?

03-09-2008, 08:42 PM	#2
Ed the Roofer Super Moderator Join Date: Jan 2007 Posts: 2,384	double layer decking NO! You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years. In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place. I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it. Do it right to save the expense of having to re-do it again for alot more money. Ed

03-09-2008, 08:50 PM	#3
gusco1 Newbie Join Date: Mar 2008 Location: VA. BEACH, VA. Posts: 9	double layer decking [quote=Ed the Roofer;105946]NO! You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years. In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place. I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it. Do it right to save the expense of having to re-do it again for alot more money.

03-09-2008, 08:51 PM	#4
gusco1 Newbie Join Date: Mar 2008 Location: VA. BEACH, VA. Posts: 9	double layer decking o.k. thats not what i wanted to hear. so what do you recommend for decking for 2x4"s on 24" centers?

03-09-2008, 09:23 PM	#5
Ed the Roofer Super Moderator Join Date: Jan 2007 Posts: 2,384	double layer decking Some of the codes around the towns I work in allow 1/2", but if you go that route, use the 4-ply instead of the 3-ply. For a few buck more, upgrade to 5/8" or 3/4" and the deck won't bounce at all, especially at 24" oc. Ed

double layer decking