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Homeowner Forum / Construction / May 2005Stair jack spacing with Trex?
I was at Dunn Lumber today, and they told me that Trex is about to change their recommendation for stair jack spacing to nine inches! Can anyone here confirm that? Thanks -Mark What is a stair jack? >I was at Dunn Lumber today, and they told me that > Trex is about to change their recommendation for [quoted text clipped - 3 lines] > Thanks > -Mark > What is a stair jack? I _intended_ it to be that zigzaggy support that the stair treads and risers are attached to. >> What is a stair jack? > >I _intended_ it to be that zigzaggy support >that the stair treads and risers are attached to. You mean the "stringer"? > You mean the "stringer"? Yes, if it's the zig-zaggy stringer that supports the stairs. >> You mean the "stringer"? > >Yes, if it's the zig-zaggy stringer that supports >the stairs. I didn't know anything about Trex before you posted, so I looked it up. A basic 2x10 plank used as a tread can span about 32" but it would be pretty bouncy in a open toe stair. A 36-40 wide open toe stair requires a min. of 3 stringers (usually a notched 2x12 or 1" thk OSB). I was a little surprised to see that they recommend a max spacing of 12" for Trex. I guess this stuff has a bit more bounce and less structural capability of a 2x10. BTW, what is the relative cost of this material compared to cedar or "plastic wood"? > I didn't know anything about Trex before you posted, so I looked it up. A > basic 2x10 plank used as a tread can span about 32" but it would be pretty [quoted text clipped - 8 lines] > BTW, what is the relative cost of this material compared to cedar or > "plastic wood"? I believe that Trex is what you might call "plastic wood." It is made from recycled plastic with wood fibers mixed in. Yes, Trex definitely has more flex than wood. You will _really_ notice this if you load it into your truck on a ninety-degree day. I went with 12" spacing on the stringers, which I believe will work fine. I did call Trex tech support first, and their phone rep has heard nothing about a change in the recommended spacing for the stringers. Here in Seattle I paid $37.18 for a twenty-foot 5/4x6 deck board, and $39.74 for a twelve-foot 1x8, both in the standard "Winchester Gray." Trex is not cheap stuff. But someday, when my porch framing has rotted away, I should be able to re-use the Trex on my next porch (especially since I'm fastening it from the bottom.) -Mark Nope. Can't confirm that. Guess you're speaking of the stringers. Jacks are normal verbage associated with a a hip roof framing. What they have published at their webiste, see page 16 (Acrobat page 6 of 14) here: http://www.trex.com/products/installation/pdf/Installation.pdf They call 'em stringers here too.... > I was at Dunn Lumber today, and they told me that > Trex is about to change their recommendation for [quoted text clipped - 3 lines] > Thanks > -Mark |
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