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RE: Timber floor level tolerances[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Timber floor level tolerances
- From: "Thor Tandy" <vicpeng(--nospam--at)telus.net>
- Date: Tue, 29 Mar 2011 14:13:33 -0700
Thank you everyone who responded. Some excellent references to follow up. I conclude the following generalizations.
1) David Ballast’s book could be worth getting.
2) Subject to structural distress there are no prescribed/specified tolerances for standard timber framed structures. There are some for post & beam assemblies.
3) Tolerances should be determined/agreed upon before beginning of project. I see there are several checklists available on line, which makes me wonder why there are no agreed tolerances.
4) Generally allowed: ¼” between adjacent joists and ½” to ¾” over 20’-0”. (Our Home Warranty scheme gives floor slopes a tolerance of 1” in 20’-0” [L/240?])
5) Whether tolerance(s) are adequate, or not, should probably be the buyer’s “beware” awareness … ?
6) In our present case, we had a closet that was intimately connected to a long span beam in second floor directly seated on the main floor. We concluded that the upper beam/closet assembly put the main floor joists in to sag, possible when the joist were still not 100% KD and the set has “set”. No rebound when closet/beam joint removed … a number of usually unrelated details adding up to create a problem. We evened out the floor but now the Owner sees all the other warts and the only explanation available is that the as-built tolerances, while sensed, are not outside possible construction inaccuracies … but there is still a general slope trend over the entire floor extent.
Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
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