cyclone1111

Funny coincidence that I am currently in the process of cutting out eight dry-rotted 2X12 floor joist underneath our old bathroom from a 1939 Florida house. When built they used 4 inch nails every two inches, 12 foot span to nail down the diagonal tongue and groove subfloor.
To try and pry them out...impossible! the best solution so far is to pry a small section enough to get a premium demolition blade between the subfloor and joist, at first it cuts the nails like butter!. The only problem is; as I move along the joist and the gap gets tighter the friction between the two pieces of wood heats up the blade and greatly diminishes the ability to "cut like butter".
I am having to use two blades per joist.
8 joist X 2 blades @ $6 a blade....well not a really inexpensive demo.
The Ability of the sharpness (tool life) to withstand or not withstand heat build-up.