Hello,

I'm building a picnic pavilion and was trying to figure out
what size rafters I need. I'm trying to get away with 2X4's 24" OTC.
The building is 10'X16' so the span is 5' on each side. There will be
an overhang of about 2 feet. So the rafter needs to be 7 feet but for
calculations it is only 5 feet (ridge board to top sill plate). Can I
get away with 2X4's? I'm in southwestern PA, zone 5.

Here's the stats for my area:

Code: BOCA 1999
Wind: 80
Ground Snow: 25

Live Load:20
*Roof Snow:18
Exposu B

Acceleration Coefficient (Aa):0.05
*Roof Snow is a calculation based on the Ground Snow.

Thanks,

Sam Hopkins

In article ,
(Sam Hopkins) wrote:

Hello,

I'm building a picnic pavilion and was trying to figure out
what size rafters I need. I'm trying to get away with 2X4's 24" OTC.
The building is 10'X16' so the span is 5' on each side. There will be
an overhang of about 2 feet. So the rafter needs to be 7 feet but for
calculations it is only 5 feet (ridge board to top sill plate). Can I
get away with 2X4's? I'm in southwestern PA, zone 5.

Here's the stats for my area:

Code: BOCA 1999
Wind: 80
Ground Snow: 25

Live Load:20
*Roof Snow:18
Exposu B

Acceleration Coefficient (Aa):0.05
*Roof Snow is a calculation based on the Ground Snow.

Thanks,

Sam Hopkins

What does your building code say? You did do that research, correct?

Robert Morien wrote in message ...
In article ,
(Sam Hopkins) wrote:

Hello,

I'm building a picnic pavilion and was trying to figure out
what size rafters I need. I'm trying to get away with 2X4's 24" OTC.
The building is 10'X16' so the span is 5' on each side. There will be
an overhang of about 2 feet. So the rafter needs to be 7 feet but for
calculations it is only 5 feet (ridge board to top sill plate). Can I
get away with 2X4's? I'm in southwestern PA, zone 5.

Here's the stats for my area:

Code: BOCA 1999
Wind: 80
Ground Snow: 25

Live Load:20
*Roof Snow:18
Exposu B

Acceleration Coefficient (Aa):0.05
*Roof Snow is a calculation based on the Ground Snow.

Thanks,

Sam Hopkins

What does your building code say? You did do that research, correct?

Lots of things like that have been built with 2x4 rafters. The only
thing (other than local code) that I see wrong with them is the
weakness caused by cutting the birdsmouth. That effectively reduces
the part supporting the 2' overhand to a 2x2 or 2x3. Of course if you
use metal brackets with no birdsmouth - no problem.

Correction to your figures before you buy the lumber. Your rafters
will be longer than 7' if there is any rise at all to your roof.

Harry K

A rafter will only be 7 feet long with a 5' span and a 2' overhang if it is
a flat roof. Any slope will add to the length.


"Sam Hopkins" wrote in message
om...
Hello,

I'm building a picnic pavilion and was trying to figure out
what size rafters I need. I'm trying to get away with 2X4's 24" OTC.
The building is 10'X16' so the span is 5' on each side. There will be
an overhang of about 2 feet. So the rafter needs to be 7 feet but for
calculations it is only 5 feet (ridge board to top sill plate). Can I
get away with 2X4's? I'm in southwestern PA, zone 5.

Here's the stats for my area:

Code: BOCA 1999
Wind: 80
Ground Snow: 25

Live Load:20
*Roof Snow:18
Exposu B

Acceleration Coefficient (Aa):0.05
*Roof Snow is a calculation based on the Ground Snow.

Thanks,

Sam Hopkins

On Fri, 8 Oct 2004 21:19:28 -0400, someone wrote:

A rafter will only be 7 feet long with a 5' span and a 2' overhang if it is
a flat roof. Any slope will add to the length.

He'll be buying 8 foot anyway, I presume.

-v.

(v) wrote in message ...
On Fri, 8 Oct 2004 21:19:28 -0400, someone wrote:

A rafter will only be 7 feet long with a 5' span and a 2' overhang if it is
a flat roof. Any slope will add to the length.

He'll be buying 8 foot anyway, I presume.

-v.

If he needs 7' (doubtful) he buy 14' and cuts in half or buys at a
real lumber yard where they will cut them for him. At today's lumber
prices it pays to plan lengths and cuts carefully.

Harry K

On 10 Oct 2004 07:01:34 -0700, someone wrote:

... buys at a
real lumber yard where they will cut them for him....

?? I think of a "home center" as someplace that cuts boards for
customers, and a "real lumber yard" as someplace that sells stock
sizes to contractors who have their own saws and cut their own
lengths!

-v.

(v) wrote in message ...
On 10 Oct 2004 07:01:34 -0700, someone wrote:

... buys at a
real lumber yard where they will cut them for him....

?? I think of a "home center" as someplace that cuts boards for
customers, and a "real lumber yard" as someplace that sells stock
sizes to contractors who have their own saws and cut their own
lengths!

-v.

Wrong. I have never seen a 'real' lumberyard that didn't cater
heavily to homeowners/handymen. Eveyone I do business with is more
than happy to cut to size for me. I have never purchased (yet) from a
"home center" if you are referring to the discount stores.

Harry K

(Sam Hopkins) wrote in message . com...
Hello,

I'm building a picnic pavilion and was trying to figure out
what size rafters I need. I'm trying to get away with 2X4's 24" OTC.
The building is 10'X16' so the span is 5' on each side. There will be
an overhang of about 2 feet. So the rafter needs to be 7 feet but for
calculations it is only 5 feet (ridge board to top sill plate). Can I
get away with 2X4's? I'm in southwestern PA, zone 5.

Here's the stats for my area:

Code: BOCA 1999
Wind: 80
Ground Snow: 25

Live Load:20
*Roof Snow:18
Exposu B

Acceleration Coefficient (Aa):0.05
*Roof Snow is a calculation based on the Ground Snow.

Thanks,

Sam Hopkins

Sam

Keep in mind that the building code is minimum acceptable
requirements. If your planning on enjoying your picnic pavilion for
years to come, I would suggest using 2x6 rafter material, 16" O.C. I
prefer the 2x6 for the same reason Harry mentioned, after cutting out
for the birdsmouth, there is little material left for structural
strength.

Good luck
kl