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Re: Point Load on Plywood Flooring

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You didn't specify what your joist spacing was.  That may make a difference. The hardwood will help spread the load applied to the subfloor.  I would also recommend at a minimum that you block all your panel edges anywhere on the floor that the piano may be located.
I'd contact an APA rep.  I've looked through the literature I have in my office, and can't find anything on concentrated loads on plywood floors, other than panels rated as 'underlayment' "posess high concentrated and impact load resistance."  I can't find where "high" is defined. 
Web address is, phone is 253-565-6600.  7011 So. 19th St., PO Box 11700, Tacoma, WA  98411-0700.
Conrad Guymon, P.E.
----- Original Message -----
To: seaint
Sent: Tuesday, June 19, 2001 9:47 AM
Subject: Point Load on Plywood Flooring

Greetings and Salutations:
I have an upcoming project, (residential), with a conventional floor framing system.  The owners have a 700 pound piano supported with three small legs.  The floor framing system will consist of hardwood flooring over 3/4" plywood, (or equivalent), supported by 2x12 floor joists.  As we can not control the location of the point load, how can we support the concentrated load of the piano leg? 
In the cases, we had limited allowances for movement due to the room shape and blocking was added to resist the concentrated loads.  With this project, the piano may be anywhere on the first floor.
Any thoughts, suggestions, directions will be greatly appreciated.

Bobby Jenkins, P.E.
Jenkins Engineering, Inc.
PO Box 2101 / 218 S Thomas St  Suite 209
Tupelo, MS  38803
(662) 840.1233 V / (662)840.1103 F