"jamesgangnc" wrote in message
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On Jul 25, 10:40 am, Steve Barker wrote:
On 7/25/2010 9:27 AM, Harry K wrote:
On Jul 25, 7:17 am, Steve wrote:
On 7/25/2010 8:43 AM, ROANIN wrote:
Steve Barker wrote:
On 7/25/2010 7:58 AM, ROANIN wrote:
When making headers for windows etc, is it better to use Plywood or
OSB between the 2 x's
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what ever is the proper thickness for what you need to end up with.
Sometimes i just use scrap blocks of sheetrock.
Does not the Plywood or OSB add a bit of structual strength to the
header?
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Not that i've seen or read. It's the 2 or 3 two by whatevers that
provide the proper support. The spacers are just to make the whole
thing the right thickness for the wall.
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Steve Barker
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But my buildign inspector required that I replace my double 2x6 porch
support beam with double 2x8 with a 1/2" ply well glued.
Of course it is the old "what the inspector wants, is what he
gets" 
. I did talk him out of some of his other complaints. Built
his way I could have parked a D6 dozer on it.
Harry K
that's the problem with inspectors and inspections. They tend to do it
"thier" way and not the book way. That's why i read the book and leave
the inspectors, inspections, and permits out of the deal.
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Steve Barker
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I agree. The ply is mostly just to make the two other boards conform
to the 3 1/2" wall thickness. I've seen all sorts of scraps used in
that application. If 2x8 was marginal then maybe the inspector was
doing you a favor. What did the span tables call for? What's your
span? Double 2x6 as beam is not a lot of beam. The ability to resist
deflection goes up a lot as you increase the height of the beam. Not
because of the increased strength but because of the increased
distance between the top and the bottom. That's how they make I beams
out of 2x4 and osb.
So from what I am reading, the glue and nails that hold the plywood or osb
between the 2 x 'S do nothing to increase the strength of the header?
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