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breezeway collar ties M 11-24-2006
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Posted by M on November 27, 2006, 7:53 pm

>> RicodJour wrote:
>> > M (nospam) wrote:
>>
>> > > I am not
>> > > changing the rafters as they are purposely 24" O.C. on one side and
>> > > 16" O.C.
>> > > on the other for cosmetic reasons.
>>
>> > For the life of me, I can't come up with a reason for doing it that way
>> > other than you had a certain amount/size of lumber available and worked
>> > with what you had. Please tell me what I'm overlooking.
>>
>>
>> Must be exposed rafter tails.
>
> ?? Why would exposed tails look better with one spacing on one side
> and another spacing on the other side? The exterior picture the OP
> posted has very little overhang and doesn't seem to show exposed tails
> - can't really tell, though. I think I'll wait for the OP's
> explanation.
>
> R
>

yes the rafter tails are different. The older side was 16 on center exposed
rafters and tails.. (see photo) and the new section which is lighter in
color is 24 on center. The tails are exposed under the over hang by about
12 or 14 inches. How about if I sister the rafters to take up the areas and
then use collar ties. I have pics in

http://www.geocities.com/guitarage41/DCP_8537.JPG

http://www.geocities.com/guitarage41/DCP_8539.JPG

Like I said it is only an 8 x 10 breezeway... but it is Maine so I guess
snow load is a concern. Marson had a suggestion but I don't understand what
he is saying exactly about the posts and the headers. He replied in my
other post.



AppliancePartsPros.com, Inc.
Posted by marson on November 27, 2006, 9:24 pm

M (nospam) wrote:
> >> RicodJour wrote:
> >> > M (nospam) wrote:
> >>
> >> > > I am not
> >> > > changing the rafters as they are purposely 24" O.C. on one side and
> >> > > 16" O.C.
> >> > > on the other for cosmetic reasons.
> >>
> >> > For the life of me, I can't come up with a reason for doing it that way
> >> > other than you had a certain amount/size of lumber available and worked
> >> > with what you had. Please tell me what I'm overlooking.
> >>
> >>
> >> Must be exposed rafter tails.
> >
> > ?? Why would exposed tails look better with one spacing on one side
> > and another spacing on the other side? The exterior picture the OP
> > posted has very little overhang and doesn't seem to show exposed tails
> > - can't really tell, though. I think I'll wait for the OP's
> > explanation.
> >
> > R
> >
>
> yes the rafter tails are different. The older side was 16 on center exposed
> rafters and tails.. (see photo) and the new section which is lighter in
> color is 24 on center. The tails are exposed under the over hang by about
> 12 or 14 inches. How about if I sister the rafters to take up the areas and
> then use collar ties. I have pics in
>
> http://www.geocities.com/guitarage41/DCP_8537.JPG
>
> http://www.geocities.com/guitarage41/DCP_8539.JPG
>
> Like I said it is only an 8 x 10 breezeway... but it is Maine so I guess
> snow load is a concern. Marson had a suggestion but I don't understand what
> he is saying exactly about the posts and the headers. He replied in my
> other post.

hopefully this helps....so the weight of snow on the roof will want to
push the ridge down. since the rafters push against each other, the
rafters want to push the walls apart. this is a bad thing. collar
ties prevent this. but the other way to prevent this spreading apart
of your walls is by holding the ridge board up with posts on either
end. this is known as a structural ridge. (the posts need to transfer
the load to the foundation--thus you would need headers over the doors
into the breezeway to accomplish this.) you have a 2x8(?) ridge which
is probably insufficient (?) to span 10 feet, so you would probably
need more of a beam--which could be put under your current ridge board.


Posted by HerHusband on November 29, 2006, 9:33 am
> the other way to prevent this spreading apart of your walls
> is by holding the ridge board up with posts on either end.
> this is known as a structural ridge. (the posts need to
> transfer the load to the foundation--thus you would need
> headers over the doors into the breezeway to accomplish this.
> you have a 2x8(?) ridge which is probably insufficient (?)
> to span 10 feet

Assuming a 40 psf roof load, the 8x10 roof would hold 3200 pounds, or 1600
on the ridge beam. According to the tables I have, a 2x8 beam will only
support about 1400 pounds over 10 feet (1400 fiber stress). A 2x10 ridge
would probably be adequate though, since it supports 2237 pounds.

Anthony

Posted by M on November 29, 2006, 6:50 pm

>> the other way to prevent this spreading apart of your walls
>> is by holding the ridge board up with posts on either end.
>> this is known as a structural ridge. (the posts need to
>> transfer the load to the foundation--thus you would need
>> headers over the doors into the breezeway to accomplish this.
>> you have a 2x8(?) ridge which is probably insufficient (?)
>> to span 10 feet
>
> Assuming a 40 psf roof load, the 8x10 roof would hold 3200 pounds, or 1600
> on the ridge beam. According to the tables I have, a 2x8 beam will only
> support about 1400 pounds over 10 feet (1400 fiber stress). A 2x10 ridge
> would probably be adequate though, since it supports 2237 pounds.
>
> Anthony

And how much snow would it take to get up to 1400 lbs over an 8 x 10
breezeway roof?... 20- 30 feet of snow? I will do something though because
I like over kill.... I am thinking of supporting under each end of the
ridge board and collar tieing the two sets of rafters that match up ...
and maybe a turnbuckle or two



Posted by marson on November 29, 2006, 7:05 pm

M (nospam) wrote:
> >> the other way to prevent this spreading apart of your walls
> >> is by holding the ridge board up with posts on either end.
> >> this is known as a structural ridge. (the posts need to
> >> transfer the load to the foundation--thus you would need
> >> headers over the doors into the breezeway to accomplish this.
> >> you have a 2x8(?) ridge which is probably insufficient (?)
> >> to span 10 feet
> >
> > Assuming a 40 psf roof load, the 8x10 roof would hold 3200 pounds, or 1600
> > on the ridge beam. According to the tables I have, a 2x8 beam will only
> > support about 1400 pounds over 10 feet (1400 fiber stress). A 2x10 ridge
> > would probably be adequate though, since it supports 2237 pounds.
> >
> > Anthony
>
> And how much snow would it take to get up to 1400 lbs over an 8 x 10
> breezeway roof?... 20- 30 feet of snow? I will do something though because
> I like over kill.... I am thinking of supporting under each end of the
> ridge board and collar tieing the two sets of rafters that match up ...
> and maybe a turnbuckle or two

FYI, if you had 100" of snow in a season, and the snow had a 1 to 10
water to snow ratio, that would add up to about 54 psf. You also
might need to add in drift loading. So it isn't extreme overkill by
any stretch


Page 4 of 5       < 1 2 3 > last >>
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