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Rafter ties (metal straps) hogheavenfarm 04-02-2008
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Posted by hogheavenfarm on April 2, 2008, 1:57 pm
Here is a question I get asked alot, and I am not sure of the answer.
We build houses in High Wind Zones often, largely on the Jersey shore.
We frequently need to strap the peaks and the rafters to the top
plates and the studs. The question always comes up with the smaller
parts. What do you do with a 5ft dormer? Rafter ties? Peak straps?
Full blocking for all plywood seams? We currently do all of the above,
but I wonder if it is truly necessary for such a small roof area that
is at right angles to the wind plane.

Posted by RicodJour on April 2, 2008, 7:01 pm
> Here is a question I get asked alot, and I am not sure of the answer.
> We build houses in High Wind Zones often, largely on the Jersey shore.
> We frequently need to strap the peaks and the rafters to the top
> plates and the studs. The question always comes up with the smaller
> parts. What do you do with a 5ft dormer? Rafter ties? Peak straps?
> Full blocking for all plywood seams? We currently do all of the above,
> but I wonder if it is truly necessary for such a small roof area that
> is at right angles to the wind plane.

The smaller dormer could easily experience more turbulence and be
subjected to greater forces, and since code requires that certain
areas (end zones) be designed with a greater wind load for a given
wind speed, you're right in not skimping on the dormer.

R

Posted by Matt W. Barrow on April 2, 2008, 7:16 pm

>> Here is a question I get asked alot, and I am not sure of the answer.
>> We build houses in High Wind Zones often, largely on the Jersey shore.
>> We frequently need to strap the peaks and the rafters to the top
>> plates and the studs. The question always comes up with the smaller
>> parts. What do you do with a 5ft dormer? Rafter ties? Peak straps?
>> Full blocking for all plywood seams? We currently do all of the above,
>> but I wonder if it is truly necessary for such a small roof area that
>> is at right angles to the wind plane.
>
> The smaller dormer could easily experience more turbulence and be
> subjected to greater forces, and since code requires that certain
> areas (end zones) be designed with a greater wind load for a given
> wind speed, you're right in not skimping on the dormer.
>
Pardon,

How could a smaller dormer experience MORE turbulence?

Thanks!



Posted by RicodJour on April 3, 2008, 12:16 am
wrote:
>
> >> Here is a question I get asked alot, and I am not sure of the answer.
> >> We build houses in High Wind Zones often, largely on the Jersey shore.
> >> We frequently need to strap the peaks and the rafters to the top
> >> plates and the studs. The question always comes up with the smaller
> >> parts. What do you do with a 5ft dormer? Rafter ties? Peak straps?
> >> Full blocking for all plywood seams? We currently do all of the above,
> >> but I wonder if it is truly necessary for such a small roof area that
> >> is at right angles to the wind plane.
>
> > The smaller dormer could easily experience more turbulence and be
> > subjected to greater forces, and since code requires that certain
> > areas (end zones) be designed with a greater wind load for a given
> > wind speed, you're right in not skimping on the dormer.
>
> Pardon,
>
> How could a smaller dormer experience MORE turbulence?
>
> Thanks!


Posted by RicodJour on April 3, 2008, 12:19 am
wrote:
>
> >> Here is a question I get asked alot, and I am not sure of the answer.
> >> We build houses in High Wind Zones often, largely on the Jersey shore.
> >> We frequently need to strap the peaks and the rafters to the top
> >> plates and the studs. The question always comes up with the smaller
> >> parts. What do you do with a 5ft dormer? Rafter ties? Peak straps?
> >> Full blocking for all plywood seams? We currently do all of the above,
> >> but I wonder if it is truly necessary for such a small roof area that
> >> is at right angles to the wind plane.
>
> > The smaller dormer could easily experience more turbulence and be
> > subjected to greater forces, and since code requires that certain
> > areas (end zones) be designed with a greater wind load for a given
> > wind speed, you're right in not skimping on the dormer.
>
> Pardon,
>
> How could a smaller dormer experience MORE turbulence?

More turbulence than a roof without a dormer? Easy. You're putting
an object in the way of the air stream => turbulence and quite
possibly increased localized wind speed.

R

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