Schluter Kerdi Waterproofing Membrane vs Schluter Kerdi 48" x 48" Shower Kit

Buy the Kerdi membrane roll if you are building a custom shower, a steam shower or a wet room and want to cut the waterproofing to fit your own geometry. Buy the 48" x 48" Kerdi Shower Kit if you have a standard square alcove and want the sloped tray, curb, drain and membrane in one box. Both use the same fleece-backed polyethylene sheet and the same Kerdi-Band system, so the waterproofing quality is equal; the kit adds a pre-sloped EPS foam tray rated at 57 psi and a stainless-steel grate, while the roll gives you 108 sq ft of membrane with no tray or drain. Owners of the membrane consistently report it adheres well and stays thin enough not to throw off wall flatness at laps.

• Choose the Kerdi membrane roll if your shower floor is not a 48" x 48" square, or if you are waterproofing walls, a steam room or a whole wet room and need membrane by the square foot.
• Choose the Kerdi 48" x 48" shower kit if you want a center-drain square shower built without a mortar bed and prefer one box with tray, curb, drain, corners and membrane.