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Posted by Bob Morrison on March 8, 2007, 4:37 pm
In a previous post Dennis wrote...
> Question came up earlier today by one of the engineers on floor decking.
> What products, OTHER THAN wood based or concrete, can be used for floor
> decking over joists?
>
If you are using wood joists why use anything other than wood for the
sheathing?
If it's finished surface on top of wood sheathing you are after, then
there might be fiberglass panels, steel sheets or other types of products
available. Still don't know why you would want to though.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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Posted by Dennis on March 8, 2007, 5:25 pm
Thanks Bob, it was just a hypothetical to discover if any unconventional
products were being used.
There was talk a few years ago about the use of a plastic (or some
alternative material - I can't remember now exactly what it was) composite
material that had structural capabilities for both floor decking and
exterior sheathing. But I haven't heard anything about it for some time now
and thought I would put out a feeler to see if anyone else knew anything.
(Could have been made out of seaweed for all I remember.)
Dennis
> In a previous post Dennis wrote...
>> Question came up earlier today by one of the engineers on floor decking.
>> What products, OTHER THAN wood based or concrete, can be used for floor
>> decking over joists?
>>
>
> If you are using wood joists why use anything other than wood for the
> sheathing?
>
> If it's finished surface on top of wood sheathing you are after, then
> there might be fiberglass panels, steel sheets or other types of products
> available. Still don't know why you would want to though.
>
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com
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Posted by Bob Morrison on March 8, 2007, 7:36 pm
In a previous post Dennis wrote...
> There was talk a few years ago about the use of a plastic (or some
> alternative material - I can't remember now exactly what it was) composite
> material that had structural capabilities for both floor decking and
> exterior sheathing. But I haven't heard anything about it for some time now
> and thought I would put out a feeler to see if anyone else knew anything.
> (Could have been made out of seaweed for all I remember.)
>
There are non-wood wall sheathing products, but none of these can be used
on a floor. Plywood or OSB are still the least expensive products around
for use as horizontal sheathing in residential and light frame commercial
structures.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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Posted by Dennis on March 22, 2007, 7:08 pm
Bob, I just ran across (released this month) a non-wood structural decking
made from straw, and it has a PS-2 rating.
It's going to be made by Above Board Technologies, Inc., out of
Saskatchewan.
http://www.agwest.sk.ca/publications/Bio-Bulletin/BBMar07.rtf
According to the press release, it:
* performs at a structural equivalency to OSB,
* promotes a new way of harvesting the wheat straw utilizing the stripper
header on the combine, which will save fuel costs, decrease time required to
harvest grain, and increase the amount of straw left to be sold to the panel
mills;
*provides the wheat farmer with a marketplace to sell straw, which for the
most part, is currently a waste product; and
*is completely termite resistant, unlike OSB.
It's being referred to as Oriented Structural Straw Board (OSSB).
My how the world is changing. Next week, seaweed.......
Dennis
> There are non-wood wall sheathing products, but none of these can be used
> on a floor. Plywood or OSB are still the least expensive products around
> for use as horizontal sheathing in residential and light frame commercial
> structures.
>
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com
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Posted by Bob Morrison on March 22, 2007, 8:32 pm
In a previous post Dennis wrote...
> Bob, I just ran across (released this month) a non-wood structural decking
> made from straw, and it has a PS-2 rating.
>
From the document I can see that it does not yet have a PS-2 rating. For
use as a replacement for OSB sheathing it will also need approval for use
as structural sheathing in the US from ICC. Otherwise it does not have
the horizontal shear capacity need for use in shear walls. There are
several products on the market that can be used where wind loads govern
the design, but they cannot be used where seismic governs.
Here in the Pacific NW, we get both wind and seismic!
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com
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