Flooring Tile - Stupid Beginner Mistake. What should I do now?

I wish I would have visited this forum a few days ago.

I installed 1/4 inch hardiebacker using 1 1/4 inch galvanized nails. I also taped and used thinset on the joints. I used Ultraflex 1 thinset under the hardiebacker as well.

The problem is I did all of this on particleboard. :wall:

Now I need your advice. At this point, taking it all up and getting rid of the particle board is not an option.

The joist sizes and spacings are fine but there is no plywood under the particleboard. Just the dang particleboard on the joists.

If you were in my shoes, would you go ahead and use ceramic tile on the hardiebacker and hope for the best or lay down carpet. It's a sunroom so I can use carpet but really wanted to put in tile The room connects to the kitchen which doesn't have particleboard which I will be tiling as well and wanted the tile to run throughout.

Please let me know what you think.

Thanks in advance!

Use DuraCeramic. It's flexible to some degree.:)

Particle board only over joists? That is crazy! You're sure there isn't some plywood over the joists and then particle board?

How big is this room? New addition?

I wish I would have visited this forum a few days ago.

I installed 1/4 inch hardiebacker using 1 1/4 inch galvanized nails. I also taped and used thinset on the joints. I used Ultraflex 1 thinset under the hardiebacker as well.

The problem is I did all of this on particleboard. :wall:

Now I need your advice. At this point, taking it all up and getting rid of the particle board is not an option.

The joist sizes and spacings are fine but there is no plywood under the particleboard. Just the dang particleboard on the joists.

If you were in my shoes, would you go ahead and use ceramic tile on the hardiebacker and hope for the best or lay down carpet. It's a sunroom so I can use carpet but really wanted to put in tile The room connects to the kitchen which doesn't have particleboard which I will be tiling as well and wanted the tile to run throughout.

Please let me know what you think.

Thanks in advance!
Don't see any problem with the cementacious board over the particle board as long as the seams of the hardiboard are caulked well so any water that could wind up on the tile floor does not seep in to the particle board which would make it swell up like a sponge
A. J. Ventura

No particle board what-so-ever in a tile substrate anywhere. Particle board can expand from ambient moisture and will wreck an expensive tile installation.

Cement board will wick water and moisture and WILL NOT stop water from getting to the particle board whether or not the joints are taped.:)