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Speaking of cottonwood, could it be
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CAH    Posted 02-25-2004 at 14:08:12       [Reply]  [No Email]
Is cottonwood stong enough to use as bridge trusses? I have three very large cotton wood trees standing close to a crick crossing I need to improve. They are all at least 40 ft tall, straight as can be, 28" dia or larger. Thought I could rough cut them with a chainsaw, stretch them across the crick and plank the bridge with treated 2x6's. Think it would work?

toolman    Posted 02-25-2004 at 18:47:09       [Reply]  [No Email]
cotton wood that size should last a while, i would see if you can find someone with a small mill to cut some decking for you though, i don,t care much for that pressure treated stuff and it wouldn,t even be 2in,thick im my area we use fir it lasts a long time even unpainted , i get the mill to cut me some 3in. , lay them out one way then put some going the other way to run your tires on.

Fern(Mi)    Posted 02-25-2004 at 17:50:28       [Reply]  [No Email]
Ah, I'm having a little trouble with your tree discription. Straight and tall. The cotton wood trees belong to a very large family of trees. Basicly they are a poplar. And, poplars vary widely across the nation and in every wood lot.
It may be you're discribing a tulip tree. These are tough-tough--tough. Right up there in drability with redwood and cedar and treated lumber. As far as treated lumber goes, ya might want to buy it soon. All production of this material is rumored to have ended the first of the year. Only what stocks are out there may be sold or purchased.
Find someone tree-knowledgable in-the-know in your nieghborhood to tellya exactly what these trees are. If they're tulips your in. On the other end, if they're of the paper pulp class of poplar, they're gopher-wood, like as in, put a piece in the stove and goffor more.
Gonna cover it?
Hvae fun

Mike in tn    Posted 02-25-2004 at 14:17:08       [Reply]  [No Email]
I think the strength would be fine. The problem is going to be rot. Cottonwood doesn't last long exposed to the weather.

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