03:32PM | 04/07/08
Member Since: 10/06/06
4 lifetime posts
My wife wants a new tile bathroom floor. My subfloor is 1x6's laid at a 45deg. angle across the floor joists with 4x8 sheets of particle board on top of that. I want to take up the particle board and put down plywood on top of the 1x6's, but I'm not sure what thickness I should use. I understand that tile needs a strong support subfloor and hardibacker under the tile. So, I would like to know the suggested thickness of the plywood and hardibacker that I should use.


06:13PM | 04/07/08
Member Since: 08/29/07
56 lifetime posts
Definitely remove the particleboard. If the 1x6's are in good shape and you have enough height. Install 3/4" ply perpindicular to the joists.

By the way; what do your joists look like?

What size boards?


Length of span?

Type of wood?

Sound condition?

1/4" Hardi is all you need for the floor. Or you can use Schluter Ditra. It's only 1/8" thick.


02:50PM | 04/08/08
Member Since: 10/06/06
4 lifetime posts
The floor joists are 2x10 on 16" centers with some cross-bracing between joists. The area I would like to tile is 8x21. The house is 28ft wide using 14ft joists so the span of each joist is 14ft. So the floor would cover all of one span plus 7ft of the other. I suspect the joists are Southern Pine, but not really sure. They look to be in good condition.


04:32PM | 04/08/08
Member Since: 08/29/07
56 lifetime posts
Your deflection on that floor should be fine for ceramic. It falls short for natural stone.

If you have SYP joists; and those 1x6's are still in great shape. I would assume minimum 1/2" but 3/4" ply is always better.

Run the ply perpindicular to the joists. screwing no deeper than the thickness of the two layers. Don't use screws long enough that they will penetrate the joists.

For even more help on this topic, go to:

There's guys here who can answer any question you have concerning tile. Including proper subfloor construction.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

Deep blue grays like the shade shown in this example "have a nautical, serene feeling," says Amy Hendel, designer for Hend... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon