While not considered backer board water resistant drywall can be used in spaces where occasional splashes may occur but which are otherwise dry such as a glass tile backsplash in the kitchen.
Tile on drywall vs backer board.
A lot of people do it in different ways.
Some people go directly to the drywall.
Thick 4 x 8 ft.
This can be done prior to installing the extra drywall strip to close the space or screw a two by four to the back of the last drywall sheet.
The sheets are made from a water repellent gypsum core covered by water resistant paper.
The way ligno is designed is that it s 3 4 inch thick and is supposed to sit directly on top of the floor joists so that once it s installed it sits.
It is made of cement water silica limestone flour and fibers such as kevlar or fiberglass for increased strength.
Easier to handle than cement board densshield tile backer cuts and installs like drywall without special tools or fasteners.
Or you could use there s a georgia pacific product called densarmor which is a tile backer and that will work very well and it s a lot easier to use than sometimes the cement backer boards are.
These products consist of a high performance water resistant gypsum board produced with certainteed s patented proprietary embedded glass reinforced gypsum egrg.
Water resistant drywall is less expensive than cement or gypsum backer board but it shouldn t be used in very damp or wet areas.
This product resists direct moisture making it a top choice for installation in areas of high humidity.
Densshield tile backer conforms to requirements of 2009 ibc irc code for tile backer in wet areas.
Cement board is a very hard panel formed by cement slurry and reinforced fiberglass mesh.
Cement backer board is a mineral based pre fabricated wall unit usually 1 4 inch or 1 2 inch thick and 3 feet by 5 feet long.
Cement board also comes in panels but that s where its similarity to drywall ends.
It can also be painted or used in non wet areas.
Water resistant drywall is a good backer board choice behind sinks and other places where occasional splashing and high humidity could affect regular drywall.
But if wedi board transitions to wall board which then transitions to the ceiling then it s ok to use sealant between wedi and drywall as any sealant would then be covered by tile.
It provides a strong base on which to install tile and stone.