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Old 10-11-2018, 12:29 PM   #1
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Floorboard depth


Hello, could anyone advise on the depth of the chipboard floorboards in my 1999 Bovis home. Am tiling my bathroom floor and have some Jackoboards 10mm to install and am concerned about how to fix them properly if the floorboards are only 18mm. Should I put another layer of ply between the floorboards and jackoboards? Thanks
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Old 10-11-2018, 12:50 PM   #2
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Re: Floorboard depth


Find a hole in the subflooring, at where plumbing was put through should be good.

Measure what you have, none of us built your house, and can only guess at the dimensions.

Especially with no picture or reference to gauge against.

I am not trying to be mean, just stating fact.

There should be holes by the plumbing, electrical, or heating vents to measure .


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Old 10-11-2018, 02:02 PM   #3
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Re: Floorboard depth


If you can't find an existing hole to measure the thickness of the subfloor you could drill a small hole in a corner or some out of the way place to get your measurement. Remember the thickness of the subfloor isn't the only thing to be concerned with - you also need to know the joists size and span.
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Old 10-11-2018, 02:30 PM   #4
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Sorry for ignorance but as I’m only planning on screwing the jackoboards into the floorboards why does knowing the joist specifics matter?
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Old 10-11-2018, 04:43 PM   #5
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Re: Floorboard depth


It's all about deflection. Tile is rigid and needs a rigid floor under it. If it flexes any the grout or tile is apt to crack. Cement board adds no structural value, just gives a good base for the tile to adhere to.
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Old 10-11-2018, 08:43 PM   #6
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Re: Floorboard depth


Quote:
Originally Posted by NorthTerrace View Post
Hello, could anyone advise on the depth of the chipboard floorboards in my 1999 Bovis home. Am tiling my bathroom floor and have some Jackoboards 10mm to install and am concerned about how to fix them properly if the floorboards are only 18mm. Should I put another layer of ply between the floorboards and jackoboards? Thanks

I'm guessing you are in the UK/Europe? Most posters here, myself included, are North American and don't know what a Bovis house or jackoboard are.


I'm a little confused. You seem to be asking how to tell how "deep" (thick) your floorboards are, then advise us that they are 10mm. As mentioned, tile needs a very rigid surface to adhere and last. Ten mm isn't bad for a floorboard (roughly 3/4") but I don't know if what you call chipboard is rigid enough. A 10mm (a little more than 3/8") board won't add a whole lot of rigidity but the board you mention might be necessary as a backing membrane for the tile. I don't know if the chipboard will hold a screw well enough. Over here there are specialty flooring screws. Even at that, layers of sub-flooring are often glued as well.
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Old 10-11-2018, 09:05 PM   #7
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Re: Floorboard depth


Add "chipboard" to the list.
OSB, particle board would be common US terms for common subfloors.
Particle board being one that should never be used as a subfloor under tile!
Subfloor, not floorboards.
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Old 10-11-2018, 09:06 PM   #8
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Re: Floorboard depth


Add "chipboard" to the list.
OSB, particle board would be common US terms for common subfloors.
Particle board being one that should never be used as a subfloor under tile!
Subfloor, not floorboards.
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