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Use of table in UCBC

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Carpenter Man
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Posted: Sun Sep 3rd, 2006 07:01 pm

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I noticed that in Table A-1-D of the Uniform Code for Building Conservation that it gives an allowable value of 500 pounds per linear foot for straight sheathed floor diaphragms having some kind of overlay on top that is installed perpindicular to the straight sheathing. I see oak overlay on the houses I work on. Does this mean I can assume I have an existing floor-to-sheathing-to-joist connection that can resist this much force?

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Last edited on Mon Jul 9th, 2007 11:26 am by Howard

Howard
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Posted: Mon Sep 11th, 2006 02:02 am

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We use this value in our designs. I asked an engineer friend about his and this is what he said"

The function of UCBC Table A -1-D is to allow the use of probable values instead of provable values. Without a Table like A-1-D we would have to tear a house apart to know how to preserve it. The Table provides a consensus opinion of reasonable value that designers can use without fear of a lawsuit if it should prove to be wrong. You can use a code-Table value with confidence that it is safe for you to use [but not with equal confidence that it is correct, or provides safety for the home of every home owner] – because it’s in an adopted code, However, you won’t have that kind of protection against legal action if you use an unpublished value just because it seems reasonable to you, and it turns out after a major quake that you were wrong. The benefit of a retrofit code is that, from a community viewpoint, it will result in many fewer people homeless after a major quake; it does not guarantee that the family of a particular home will not become homeless.

Howard

njineer
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Posted: Mon Sep 11th, 2006 06:22 am

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The oak floor overlay satisfies the intent of item 1.1.4 in Table A-1-D provided you are able to verify the condition if the oak flooring runs parallel to the joists [perpendicular to the straight sheathing boards].

If the oak boards run perpendicular to the joists [parallel to the sheathing boards], the "offset" conditon is probably impossible to verify without taking the floor apart -- it is not likely that the floor installer would take care to assure that there were no aligned joints.

(from Howard: "njineer" is Bay Area Retrofit's main engineer consultant and mentor)

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