Ceramic Tile Over Mastic

To replace a broken tile butter the back of a new tile with mastic and press it securely.

Ceramic tile over mastic.

Best used for tiles in the 8 inch range or smaller. Roughen the tile with 80 grit sandpaper. When the building was converted to residential the developer removed the vinyl tiles and just carpeted over the mastic. The adhesive often called carpet mastic used under most glue down carpet is usually water soluble and tends to prevent thinset from properly adhering.

Mastic is an organic glue made from the sticky resin of the mastic tree. Grind them down with a grinder. You can lay new ceramic tile right over the old using the prep techniques we show here. When i walk on what i have tiled sometimes i pop up a tile or a couple tiles but over most of the area i can walk fine.

Tiling over an uneven surface will give you less than stellar results so level out any globs of dried grout with a sander and secure loose tiles with fresh tile adhesive before beginning the project. Liquid nails would be a notable example of the thin liquid form where it comes in a caulking tube and squeezed out along a wall or joists to hold load bearing walls and ceilings in place. Remove any cracked broken or loose tiles with a hammer and chisel and replace them with new tile. If you do decide to remove it yourself i found that the best way to remove.

Press the tile onto the floor. Not recommended for tiles over 15 inches. Mastic adhesive is very sticky making it well suited for vertical applications where tile may slide. Lay a level on the old tile and mark any high spots.

It s available as a thin liquid thick glue or a sticky paste. Does not fill gaps in a substrate or have building characteristics as it is more watery than thinset. I don t want to go further till i know what i need to do to the mastic it s a very thin coat as if applied with a brush or roller it s not at all lumpy. Should the tile get wet the mastic may soften negatively affecting the bond of the tile to the substrate.

It avoids the time consuming messy tear out process. They said capping the mastic in a seal coat or thin layer of concrete wouldn t be a good idea they d need to pour rather a lot of concrete for that.