I am remodeling a half bath and have a problem that the floor has a
hump in it. The room is 63" x 72" with the high spot near the center
and a 1/8 to 1/4 inch drop nearly all the way around the walls. I have
sanded the hump down to this level (it was higher) and do not want to
thin the plywood more. I have read the threads on self leveling
compounds and durarock like applications but my question is can you use
durarock over the self leveling compound. When I drive the screws
through the durarock through the compound into the subfloor will it
mushroom the compound underneath such that you have stress
concentrations and thus cracks in the future. I want to put tile over
this. Any help or suggestions would be welcome.

"mew" wrote in message
ups.com...
I am remodeling a half bath and have a problem that the floor has a
hump in it. The room is 63" x 72" with the high spot near the center
and a 1/8 to 1/4 inch drop nearly all the way around the walls. I have
sanded the hump down to this level (it was higher) and do not want to
thin the plywood more. I have read the threads on self leveling
compounds and durarock like applications but my question is can you use
durarock over the self leveling compound. When I drive the screws
through the durarock through the compound into the subfloor will it
mushroom the compound underneath such that you have stress
concentrations and thus cracks in the future. I want to put tile over
this. Any help or suggestions would be welcome.


You have to thinset the backerboard ( durock) to the floor.( plywood
subfloor) I use a 3/8" by 3/8" trowel. I do not use screws I use 1 1/4"
roofing nails the thinset will hold it down. You can also use the thinset to
level the floor While installing the tiles

"Sacramento Dave" wrote in message
om...

"mew" wrote in message
ups.com...
I am remodeling a half bath and have a problem that the floor has a
hump in it. The room is 63" x 72" with the high spot near the center
and a 1/8 to 1/4 inch drop nearly all the way around the walls. I have
sanded the hump down to this level (it was higher) and do not want to
thin the plywood more. I have read the threads on self leveling
compounds and durarock like applications but my question is can you use
durarock over the self leveling compound. When I drive the screws
through the durarock through the compound into the subfloor will it
mushroom the compound underneath such that you have stress
concentrations and thus cracks in the future. I want to put tile over
this. Any help or suggestions would be welcome.


You have to thinset the backerboard ( durock) to the floor.( plywood
subfloor) I use a 3/8" by 3/8" trowel. I do not use screws I use 1 1/4"
roofing nails the thinset will hold it down. You can also use the thinset
to
level the floor While installing the tiles


Yes, use thinset under the durarock. Thinset will bond the durarock to the
plywood. You only need screw/nails in a few places to keep it from sliding
around as you work on the next sheet.
I find it is less messy to level the durarock first (Thinset under it)
rather than trying to level the finished tile install. Either way will work.

Thanks for the advice. I will use thinset under the durock as you
suggest.