Hardwood Floor Over Cork Tile

I am not a flooring expert but have installed hardwood floors after a good amount of research.

I cannot imagine a scenario in which nailing into a cork floor would provide the needed “purchase” to securely hold down the wood, nor would 1/4” plywood, even in combination with the cork.

I’d suggest a glue-down option, rather than nail-down, assuming that the cork is securely fastened to the subfloor.

I definitely think you can nail the hardwood floor on top of the cork tile. Cork tile is not very thick, they’re about 3/8 of an inch thick. You have to use a nail gun, and I would use staples instead of the nail. They’re about an inch and a half long, or if you’re still looking for longer nails, they are two inches long, more than enough to get to the subfloor below the cork. 
It’s added insulation already installed!! Definitely do it.

Jaytee said:

I definitely think you can nail the hardwood floor on top of the cork tile. Cork tile is not very thick, they’re about 3/8 of an inch thick. You have to use a nail gun, and I would use staples instead of the nail. They’re about an inch and a half long, or if you’re still looking for longer nails, they are two inches long, more than enough to get to the subfloor below the cork. 
It’s added insulation already installed!! Definitely do it.

Hopefully you are assuming a wood subfloor, which has not been established, given the “presumably” qualifier.

jimmurphy said:

Hopefully you are assuming a wood subfloor, which has not been established, given the “presumably” qualifier.

the OP presumed it might be plywood…. Could be old tongue and groove boards. It’s pretty simple to figure out if there’s wood underneath the cork. I presume the OP should know more than you and I if his sunroom is built on a concrete slab….

Appreciate both your guidance. I can confirm its not a concrete slab.