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 11-04-2002, 06:32 Post: 44579
TomG

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Join Date: Feb 2002
Location: Upper Ottawa Valley
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Posts: 5406

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 Floor systems

I figured there'd be a pretty good answer from Peters on this one and so there is.

I've only worked with regular joists myself. When I talk with our building inspector to see what he'll go for, he hauls out a book and looks up required floor loading for the particular application and then gives me max spans for various joist sizes. If greater spans are needed larger joists might do it or maybe doubled joists.

Larger joists do cost more and reduce headroom if that's a problem and doubled joists complicate working to centers. At any rate, I imagine that acceptable designs for most structures could be made using either type of joist.

The cost answer maybe lies in the amount of labour required for installation. If engineered joists take less work, then commercial projects may have lower overall costs with engineered joists. Do it yourself project costs may be the opposite.

In terms of a structure, I'm not sure there's an easy 'best answer.' I think that codes for the same type structure start off with a required life expectancy. Designs that use different materials are supposed to produce the same life expectancy. The subject is undoubtedly more complex than my grasp of it.






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