||07-06-2005 12:56 PM
Any way to allow a 3.5" bore through a 2x10 floor joist?
I need to bore a hole in a 2x10 floor joist to accomodate a 3" PVC pipe, the outside diameter of which is 3.5". I know the code dicates that holes in floor joists can be no greater than 1/3 the depth of the joist. So for a 2x10 joist, the actual depth is 9.25, which means that the specified hole shouldn't be any bigger than about 3". Is there any way to be code compliant in drilling a 3.5" hole? Some sort of joist reinforcement perhaps? The joist in question is really more of a "ledger board", in that it's supported not only by beams, but it's also located flush against a joist of an existing structure and fastened with wood screws (not lag screws, but that could be remedied). Any suggestions or tips?