Lynell
Member
2006 IRC Sheathing next to peak of roof is it a min. of 24 inches?
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Roof Sheathing
- Thread starter Lynell
- Start date
mtlogcabin
SAWHORSE
Re: Roof Sheathing
TABLE R503.2.1.1(1)
ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANELS FOR ROOF
AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c
c. Applies to panels 24 inches or wider.
If it is not 24 inches then it would not meet the presrciptive requirements of the IRC
TABLE R503.2.1.1(1)
ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANELS FOR ROOF
AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c
c. Applies to panels 24 inches or wider.
If it is not 24 inches then it would not meet the presrciptive requirements of the IRC
Lynell
Member
Re: Roof Sheathing
Thanks! Mtlogcabin, That was my thought just need reassured I guess.
Thanks! Mtlogcabin, That was my thought just need reassured I guess.
north star
Sawhorse
- Joined
- Oct 19, 2009
- Messages
- 4,596
Re: Roof Sheathing
Lynell,
Welcome to the codes forum!
Lynell,
Welcome to the codes forum!
TimNY
Platinum Member
Re: Roof Sheathing
Just so I have this clear in my head..
Would this be a scenario where the builder started laying sheathing at the eaves and when he got to the peak had to rip a strip to 12" wide to finish up?
or
Where a contractor starts laying at one rake, and when he gets to the other rake needs to rip a 16" wide strip to finish?
or
Both?
Thanks,
Tim
Just so I have this clear in my head..
Would this be a scenario where the builder started laying sheathing at the eaves and when he got to the peak had to rip a strip to 12" wide to finish up?
or
Where a contractor starts laying at one rake, and when he gets to the other rake needs to rip a 16" wide strip to finish?
or
Both?
Thanks,
Tim
Re: Roof Sheathing
As I recall the APA website has formula that give the allowable loads on narrower pieces of plywood.
I believe that the code section is there to prevent one from using strips less than 24" (nom) to cover the entire roof. (I have a copula with a hip roof. It violates that code section - the copula roof is not 24" from peak down.)mtlogcabin said:
As I recall the APA website has formula that give the allowable loads on narrower pieces of plywood.
Re: Roof Sheathing
I'm unclear on what's happening here; but, are ya'll stating that dimensional lumber or tongue and grove usually 4- to 8-inch wide boards that are nominally 1-inch thick (3/4-inch actual thickness) is not allowed to be used for roof sheathing?
It's my understanding that the only reason builders went to plywood and/or OSB; is because it's cheaper to install.
What am I missing here?
Uncle Bob
I'm unclear on what's happening here; but, are ya'll stating that dimensional lumber or tongue and grove usually 4- to 8-inch wide boards that are nominally 1-inch thick (3/4-inch actual thickness) is not allowed to be used for roof sheathing?
It's my understanding that the only reason builders went to plywood and/or OSB; is because it's cheaper to install.
What am I missing here?
Uncle Bob
bldginsp
Bronze Member
Re: Roof Sheathing
Uncle Bob, I believe what these fella's are refering to are for structural panels only. This code section does not include dimensional lumber.
Uncle Bob, I believe what these fella's are refering to are for structural panels only. This code section does not include dimensional lumber.
globe trekker
Registered User
- Joined
- Oct 19, 2009
- Messages
- 1,739
Re: Roof Sheathing
Uncle Bob,
I agree with bldginsp! I believe that the OP was referring to the osb type roof sheathing that is typically
"cut-to-fit" when they get to the roof ridge. Not compliant mind you, but that's just pretty typical.
At least until Uncle Bob sees it and makes them rip it out and install it correctly.
.
Uncle Bob,
I agree with bldginsp! I believe that the OP was referring to the osb type roof sheathing that is typically
"cut-to-fit" when they get to the roof ridge. Not compliant mind you, but that's just pretty typical.
At least until Uncle Bob sees it and makes them rip it out and install it correctly.
.
Re: Roof Sheathing
of course you can still use "the good stuff", UB..
If you use a ripped sheet of Plywood or OSB (especially at the ridge, eave or edges), you'll want to block between the rafters (or trusses), so you have a nailing surface for the sheathing... or you could have uplift issues.
Depends on how you propose to piece it in...
of course you can still use "the good stuff", UB..
If you use a ripped sheet of Plywood or OSB (especially at the ridge, eave or edges), you'll want to block between the rafters (or trusses), so you have a nailing surface for the sheathing... or you could have uplift issues.
Depends on how you propose to piece it in...
Re: Roof Sheathing
Reelone,
You just keep cutting them shorter as you go up. Some of the builders around here use 1by; I'll take a picture. A long, long time ago, when we used 1by for subfloors on pier and beam; we always started in a corner and worked our way diagonally across the floor joists.
Uncle Bob
Reelone,
You just keep cutting them shorter as you go up. Some of the builders around here use 1by; I'll take a picture. A long, long time ago, when we used 1by for subfloors on pier and beam; we always started in a corner and worked our way diagonally across the floor joists.
Uncle Bob
Glennman CBO
Silver Member
- Joined
- Oct 20, 2009
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- 441
Re: Roof Sheathing
What is "the good stuff"...?
I had a neighbor (back when I lived out in the sage brush sticks) that had a west facing wall (the weather side) that had OSB exposed on it for at least 14 years. The surface was a bit "flaked" but overall it looked pretty good. I doubt that plywood would last as long. No offense to plywood lovers.
What is "the good stuff"...?
I had a neighbor (back when I lived out in the sage brush sticks) that had a west facing wall (the weather side) that had OSB exposed on it for at least 14 years. The surface was a bit "flaked" but overall it looked pretty good. I doubt that plywood would last as long. No offense to plywood lovers.
J
JayHawkInspector
Guest
Re: Roof Sheathing
I have a unique question; what if you have a four inch piece at the ridge, how good would the nailing of the ridge cap shingles? Even if you have clips in this situation the nails from the ridge cap shingles would be right into the joint.
I have a unique question; what if you have a four inch piece at the ridge, how good would the nailing of the ridge cap shingles? Even if you have clips in this situation the nails from the ridge cap shingles would be right into the joint.
Re: Roof Sheathing
And as far as hip roofs, I believe as long as the bottom triangle portion of the OSB is 24" then all is well because you have the entire hip to nail the OSB to up the edge of the triangle.
These are my opinions.
Lynell said:
This is not what Lynell is referring too. Lynell is referring to "how tall" is the top strip required to be. This section of the code refers to the width.mtlogcabin said:
No. It is okay to have a strip less than 24" tall.TimNY said:
This is where the width needs to be a minimum of 24"TimNY said:
Uplift issues???? I thought this is what collar ties or ridge straps are for!peach said:
And as far as hip roofs, I believe as long as the bottom triangle portion of the OSB is 24" then all is well because you have the entire hip to nail the OSB to up the edge of the triangle.
These are my opinions.
Re: Roof Sheathing
mule wrote "This is not what Lynell is referring too. Lynell is referring to "how tall" is the top strip required to be. This section of the code refers to the width."
The APA load capacities are based on how wide ("tall") as plywood strip is.
The length of the strip also needs to have 3 bearing points.
But I think too much attention is being paid to this issue.
mule wrote "This is not what Lynell is referring too. Lynell is referring to "how tall" is the top strip required to be. This section of the code refers to the width."
The APA load capacities are based on how wide ("tall") as plywood strip is.
The length of the strip also needs to have 3 bearing points.
But I think too much attention is being paid to this issue.
JBI
Registered User
Re: Roof Sheathing
George, you're probably correct... on all three counts.
IMHO, if you need a 12" strip of roof sheathing at the top of the roof plane, you didn't lay out the job properly. If you need to place a 16" strip at the rake, you didn't lay out the job properly.
But that's just my opinion, and opinions will vary.
George, you're probably correct... on all three counts.
IMHO, if you need a 12" strip of roof sheathing at the top of the roof plane, you didn't lay out the job properly. If you need to place a 16" strip at the rake, you didn't lay out the job properly.
But that's just my opinion, and opinions will vary.
north star
Sawhorse
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- 4,596
Re: Roof Sheathing
But John, you know that `ol Paco and his crew `no habla Englais! What codes... ?
What dimensions... ?
Also, how many code officials on here have actually made a fine, upstanding builder
in that community, ...who is paying their [ the code officials ] salary, ...who is
providing jobs in that community, ...who is providing a needed service in that
community, ...who has been doing it that way for 40 yrs. and never had any
problems, [ said "tongue in cheek" ] tear the roof decking off and re-do it
correctly, or to install additional approved type fasteners [ nails or screws ] in to
that "less than code compliant" roof decking strip, or as peach mentioned,
actually install the correct type of blocking?
But John, you know that `ol Paco and his crew `no habla Englais! What codes... ?
What dimensions... ?
Also, how many code officials on here have actually made a fine, upstanding builder
in that community, ...who is paying their [ the code officials ] salary, ...who is
providing jobs in that community, ...who is providing a needed service in that
community, ...who has been doing it that way for 40 yrs. and never had any
problems, [ said "tongue in cheek"
] tear the roof decking off and re-do itcorrectly, or to install additional approved type fasteners [ nails or screws ] in to
that "less than code compliant" roof decking strip, or as peach mentioned,
actually install the correct type of blocking?