How To Seam Between Durock And A Concrete Floor

The edge of the existing concrete that was sawed should be drilled and doweled so the new concrete won t separate lift or settle from the old concrete.

How to seam between durock and a concrete floor.

Installing cement board over a concrete subfloor. You can join the new concrete right to the old concrete this is called a concrete construction joint. If there is a difference e g the floor is lower on one side lay one vertical row of tile from highest point down to floor. Cement board commonly sold under trade names such as durock hardiebacker and wonderboard is now the standard underlayment used for ceramic porcelain or stone tile laid with thinset mortar adhesive cement board is used for most floor tile and has all but replaced plywood and drywall backer materials for wall tile applications in wet areas like showers and tub surrounds.

Make the seam just wide enough to cover the entire surface of the tape generally 3 inches. Use this first row as a guide to keep tiles and grout lines. Affix tiles with dabs of mastic. For tile backer boards such as durock wonderboard hardiebacker permabase and others the seams between the board need to be treated with 2 inch alkali resistant mesh tape.

If the patio butts against the house this is where an concrete isolation joint should. Finishing tile or almost any flooring material not for use with vinyl flooring. Pressing the mortar mix through the holes in the fiberglass mesh tape and deep into the seams between the panels. Then a coat of thinset gets flat troweled over the seam.

The floor determine whether floor is level by measuring distance to desired tile height on both sides of area to be tiled. I know it seems like a smooth surface and it seems like it may fix some of the issues with the concrete floor but don t do it. If you have a concrete subfloor then you should not be contemplating installing cement board over it. Spread joint compound over the length of the tape with a 6 inch drywall knife.

Step 6 wipe excess mortar from the surface of the joints leaving a smooth flat seam. Dab additional compound over the screw holes on both the drywall and cement boards near the seam but not under the tape. After the durock panels are in place you must fill the joints before you can install the tile.