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Old 02-27-2010, 01:31 PM   #16
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You have a plank and beam floor, with 5/4” plywood instead of 2”car-decking.

“the terms “subfloor” and “underlayment” are often used interchangeably, but there is a world of difference between the two. A subfloor is a layer intended to provide structural support. Underlayment, on the other hand, is installed over a subfloor to create a smooth, durable surface upon which finish flooring is installed.” From:

The 4x8 beams are your joists, running perpendicular to the plywood decking. The slow part in installing this floor type is recessing the bolts and nuts at the exterior concrete to set below the plywood and wall bottom plate and still hold down the mudsill.

The plywood, tongue and groove joints, is rated for that span, giving support for the toilet flange. The water damage is from the wax ring leaking above. To add 2x6 cross joists and two more, perpendicular to those would give more than enough support and not against any code. (Though I don’t feel it is needed).

Dave, “A 2x4 will span ~6' as a floor joist depending upon the wood/grade” ---- 2x4 floor joists are not permitted per code, at least not since ’88 UBC.
Where are you getting this information? Is it from your local County?

This should set your mind at ease, hopefully a little anyway:

You really should insulate the floor and galvanized water supply pipes. You have to enter only the first three numbers of your zip code here:

Be safe, Gary


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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?

Last edited by Gary in WA; 02-27-2010 at 01:52 PM.
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Old 02-28-2010, 12:25 PM   #17
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I agree with above post to fix it right ..per methods advised ... looks like a 4x6 floor beams to me.

I can't tell from your good pictures how much is rot and how much might be white fungus or mold...

I have used wasp spray.. smells like it is mostly mineral spirits...
(don't soak the wax ring) should kill the white stuff and may slow down the rot. (after it drys and the smell goes away... all looks normal)

may buy you time... and you may feel like fixing it right later on.


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