I have a very old house, built in 1939. There is not a square corner or a
level floor in the place. It has 1" (best guess) hardwood t&g subfloors
topped with 5/8"particle board. The t&g wood has either rotted or been
eaten by termites. I have not removed or replaced anything yet. My
question(s) is this , Can I use 3/4" MDF or 3/4" t&g Waferboard as a
suitable replacement for the t&g hardwood? What are the expected lifespans
of these materials if they are suitable for this job? If these are not
suitable can someone recommends an inexpensive yet durable replacement
product. (3/4" plywood 29.46 sheet lowest grade at he local Home Depot)
TIA
FG

1939 is just kinda-old. Sounds like it's not gonna make a National
Register.

I'd suggest priorities:
1. repair any structural problems and possible related causes (water
leakage, insufficient foundation support, etc.) as possible first so
you can support loads. If not, find a 'plan-b'.
2. replace all damaged materials.
3. possibly by room, make floor supports level; work up from there
(subfloor, etc.)

I'd be prepared to remove lots of crap, from your statement. Might be
useful in woodstove, anyhow. :")

Seems you'll be buying LOTS of whatever materials you choose. Get
expert advice, and negotiate purchase with REAL lumber-yard. You gonna
do this yourself?

HTH,
J

If the subfloor is "either rotted or been eaten by termites", have you
solved the cause of that problem?
What are you going to do below existing partitions?
TB

advantech makes a really good subfloor 3/4 t&g.
http://www.huberwood.com/products/ds....cfm?doc_id=23