Flooring Tile - ceramic tile underlayment
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Otis
07-27-03, 02:15 PM
Hi,
This is my first post and I have a pretty complicated (for me) situation.
We tore off our old, small, odd-shaped screen porch and had a contractor add on a nice large "three season room". The old porch was two 8 foot wide 10 to 12 foot sections which came together at approximately a 135 degree angle. It had a good and solid concrete floor that had a surface nearly 3 feet above grade.
We kept the odd-shaped concrete floor and the contractor joined it to the insulated floor of our manufactured room. The flooring consists of two 1/2" particle or chip boards factory-laminated on top and bottom of 4" of closed-cell "styrofoam" type insulation. The flooring sections were custom-made and have no cross seams---i.e., they arrived in sections nearly 18' long and 4'to5' wide and were custom cut to fit the angle of the old concrete floor on one end.
So---now the room is finished except for the floor. We'd like to install 12" ceramic tile using "thin-set" mortar and grouted with a sanded grout with acrylic additive to withstand winter temperatures.
My sub-floor seems very secure and solid. Do I HAVE to use a cement board underlayment? Transitioning the application from the chip board to the old concrete is something I haven't figured out yet.
Could I just tack "luan board" over the new wood and glue it down over the old concrete and set the tile with mortar over that? I'd use a 100 lb. roller over the concrete with the adhesive.
If this is totally unaceptable, let me know. And don't hesitate to get very "basic" with me. I'm a novice who's here for your good advice.
Thanks.
This is my first post and I have a pretty complicated (for me) situation.
We tore off our old, small, odd-shaped screen porch and had a contractor add on a nice large "three season room". The old porch was two 8 foot wide 10 to 12 foot sections which came together at approximately a 135 degree angle. It had a good and solid concrete floor that had a surface nearly 3 feet above grade.
We kept the odd-shaped concrete floor and the contractor joined it to the insulated floor of our manufactured room. The flooring consists of two 1/2" particle or chip boards factory-laminated on top and bottom of 4" of closed-cell "styrofoam" type insulation. The flooring sections were custom-made and have no cross seams---i.e., they arrived in sections nearly 18' long and 4'to5' wide and were custom cut to fit the angle of the old concrete floor on one end.
So---now the room is finished except for the floor. We'd like to install 12" ceramic tile using "thin-set" mortar and grouted with a sanded grout with acrylic additive to withstand winter temperatures.
My sub-floor seems very secure and solid. Do I HAVE to use a cement board underlayment? Transitioning the application from the chip board to the old concrete is something I haven't figured out yet.
Could I just tack "luan board" over the new wood and glue it down over the old concrete and set the tile with mortar over that? I'd use a 100 lb. roller over the concrete with the adhesive.
If this is totally unaceptable, let me know. And don't hesitate to get very "basic" with me. I'm a novice who's here for your good advice.
Thanks.
ee3
07-27-03, 06:24 PM
You can not set tile directly to the chip board.Install 1/4 CBU to it with screws and thin set.I dont like the idea of chip board to the slab at all.If ANY moisture gets to the chip board you have a problem.
Daniel Wachtel
07-28-03, 05:03 PM
expanding chip board can blow even the best installation right off the floor.