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does the irc require pressure treated bottom plates on a slab on grade house?

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does the irc require pressure treated bottom plates on a slab on grade house? marson 10-23-2006
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Posted by Bob Morrison on October 24, 2006, 10:12 am
In a previous post RicodJour wrote...
> Do you specify fasteners that won't corrode at an accelerated rate in
> the ACQ? The metal connector tie downs and the hanger nails are
> corrosion resistant with ACQ already, but the sheathing and stud/plate
> fasteners should also be specified resistant. The shear walls are of
> particular concern.
>

Yes. Here are a few selected lines from my "Structural Notes":

Sill anchor bolts shall be hot dipped galvanized or stainless steel, 1/2"
minimum diameter, with a minimum embedment of 7 inches, unless noted
otherwise on Shear Wall Schedule or Foundation Details. Bolts shall be
tied in place prior to pouring concrete and shall not be "wet-set" or
"stabbed" into wet concrete.

Connectors and fasteners for pressure treated wood shall be hot-dipped
galvanized or stainless steel in accordance with IBC Section 2304.9.5.

Hardware for pressure treated wood shall be hot-dipped galvanized or
stainless steel in accordance with IBC Section 2304.9.5.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Radiant Heat 468x60
Posted by Jonny on October 24, 2006, 9:20 pm
I'd go with stainless or nonferrous as the manufacturers of hardware can't
mess this up as easily as galvanized hardware.
--
Jonny
> In a previous post RicodJour wrote...
>> Do you specify fasteners that won't corrode at an accelerated rate in
>> the ACQ? The metal connector tie downs and the hanger nails are
>> corrosion resistant with ACQ already, but the sheathing and stud/plate
>> fasteners should also be specified resistant. The shear walls are of
>> particular concern.
>>
>
> Yes. Here are a few selected lines from my "Structural Notes":
>
> Sill anchor bolts shall be hot dipped galvanized or stainless steel, 1/2"
> minimum diameter, with a minimum embedment of 7 inches, unless noted
> otherwise on Shear Wall Schedule or Foundation Details. Bolts shall be
> tied in place prior to pouring concrete and shall not be "wet-set" or
> "stabbed" into wet concrete.
>
> Connectors and fasteners for pressure treated wood shall be hot-dipped
> galvanized or stainless steel in accordance with IBC Section 2304.9.5.
>
> Hardware for pressure treated wood shall be hot-dipped galvanized or
> stainless steel in accordance with IBC Section 2304.9.5.
>
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com



Posted by Goedjn on October 24, 2006, 3:42 pm
wrote:

>In a previous post marson wrote...
>> does anyone know if the irc requires treated bottom plates on partition
>> walls on a slab on grade house? is it acceptable to use white wood
>> with a capillary break such as tarpaper on the bottom?
>>
>
>The relevant section is IRC2003 R319.1. This section allows the use of
>untreated sill plates and sleepers if the wood is separated from the
>concrete by an impervious moisture barrier.
>
>However, it seems to me that the cost of using treated plates in this
>instance is pretty nominal so why not go ahead and use them? I would
>think you would spend more horsing around with the "tar paper" than it's
>worth.


Yes, but sheet-metal termite barriers serve both purposes.


Posted by Tom The Great on October 26, 2006, 9:47 pm
wrote:

>In a previous post marson wrote...
>> does anyone know if the irc requires treated bottom plates on partition
>> walls on a slab on grade house? is it acceptable to use white wood
>> with a capillary break such as tarpaper on the bottom?
>>
>
>The relevant section is IRC2003 R319.1. This section allows the use of
>untreated sill plates and sleepers if the wood is separated from the
>concrete by an impervious moisture barrier.
>
>However, it seems to me that the cost of using treated plates in this
>instance is pretty nominal so why not go ahead and use them? I would
>think you would spend more horsing around with the "tar paper" than it's
>worth.

I think, the foam padding, used to seal against slab,bottom plate air
leakage counts as a moisture barrer too. However, I have to say you
are reasonable to belive the use of 'treated' lumber, isn't cost
prohibitative.

Sounds like good advice,

tom @ www.FreelancingProjects.com



Posted by Rudy on October 24, 2006, 1:32 am

>>is it acceptable to use white wood with a capillary break such as tarpaper
>>on the bottom?

Sure, use white plastic mudsill gasket material..the polyfoam stuff thats
about 1/4" thick X 4" or 6" and comes in rolls





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