The Kerdi membrane system requires a 2” overlap at all seams; either with the membrane itself overlapping adjacent piece or with the use of Kerdi-Band tape. … Since thin-set mortar works over almost any substrate, the Kerdi system can be used over drywall, plywood, or the various cement boards mentioned above.
What do you put under KERDI?
The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc.), Schluter SET™, ALL-SET™, FAST-SET™ or an unmodified thin-set mortar is recommended.
Can you use Kerdi-board instead of drywall?
Yes,Kerdi can be installed on drywall or cement board. However if installed on drywall it is only protecting one side. … All shower/tub areas should have concrete board (I prefer hardiboard).
Can Kerdi membrane be installed over OSB?
DITRA allows for ceramic tile application over single-layer plywood or OSB subfloors on joists spaced up to 19.2″ (488 mm) o.c.Can I use Kerdi board on the floor?
The material is equally suitable for creating level substrates in floor renovation projects e.g. residential bathroom installations designed for foot traffic. Schlüter®-KERDI-BOARD is simply cut to size with a utility knife. The gridlines printed on the surface are helpful for neat and quick installation.
What happens if you use modified thinset on Kerdi?
Modified thinset mortars aren’t recommended for use with Kerdi because they must dry out to gain strength, whereas the membrane inhibits drying, which can lead to unpredictable results. … Schluter’s recommendation is to use unmodified thinset mortar when installing Kerdi over most shower substrates.
How long should Kerdi dry before tiling?
Wait 24 hours after the membrane (i.e., Schluter®-KERDI-BAND and Schluter®-KERDI) installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing.
Does unmodified thinset stick to plywood?
Thinset is the wet base that you first trowel on the plywood to make the tile stick. Higher latex content is essential for bonding to plywood. A quality unmodified thinset should be used and mixed with a latex additive.Can you paint over Schluter membrane?
Yes you can paint over Kerdi board but you will need to give it a light coat of joint compound and do a little sanding.
Can Kerdi membrane be installed over drywall?Yes. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower.
Article first time published onIs Kerdi shower pan waterproof?
Unlike shower pan liners in traditional assemblies, KERDI is a bonded waterproofing membrane that allows for the direct application of tile with thin-set mortar. … on walls, creating a fully waterproof and vapor- tight enclosure.
Should I prime drywall before Kerdi?
No. It is not necessary to tape the joints between drywall panels before installing KERDI. If you must tape the joints per fire code requirements, make sure to apply a latex primer over the taped joints before installing KERDI.
Is Schluter Kerdi worth it?
Great product. It takes a little longer than the traditional mud shower bed and water-proofing methods, but it is worth it. … My shower is water-tight, and the sloped floor drains water perfectly. The finished product looks great.
How long will KERDI-BOARD last?
under a concrete base with the sides lapping up about 10 inches. with concrete board on the walls it will last probably 50 + years…
Do I need a vapor barrier behind Kerdi?
NO – DO NOT us a vapor barrier behind Kerdi. It is a vapor barrier.
Can you use Schluter Kerdi on floors?
With the KERDI-SHOWER-TT thin shower tray on a wood subfloor, you can build up the rest of the bathroom floor by installing either a 5/8″ or 3/4″ plywood/OSB panel on top of the wood subfloor along with DITRA or another Schluter®-Systems uncoupling membrane.
What can I use instead of cement board?
Glass mat gypsum board is a better choice. Sheets of glass mat gypsum are made from water-resistant silicone-treated gypsum, reinforced on both sides by fiberglass mats. DensShield is one common brand. It is easier to cut than cement board, it is mold resistant, and it has a built-in moisture barrier.
Do you need to seal plywood before tiling?
24 Answers from MyBuilder Tilers Plywood requires the application of a latex based bonding solution to the plywood to seal it and then the use of a flexible cement based adhesive, not pre-mixed tub adhesive.
Can I tile over plywood wall?
As plywood goes under a continuous change in size, tiles and grout can crack and cause irreversible damage. Although wall tiles can’t expand and contract, plywood can be used for tiling your floor.
Can you tile onto plywood wall?
If you are working in an interior setting in a dry area where the tile will never come into contact with water, you can install the tile directly onto the face of the plywood so long as you use the proper type of thinset.
What happens if you grout too soon?
Remember, there’s no harm in grouting your tile several days after you install it, but it is a bad idea to grout too soon. Applying grout too soon will stop the mortar curing process, leading tiles to pop loose from the floor or wall.
Can you tile over Ditra right away?
Once DITRA has been installed on the substrate, tile can be installed right away. No need to wait for the mortar to cure.
Can you tile over wet Kerdi membrane?
How long do I have to wait before I can install tile on the Schluter™-KERDI membrane? Once the KERDI membrane, including seams, corners and protrusions have been completely bonded and, therefore, waterproofed, the assembly is ready to be tiled. No wait time is required.
Why does Kerdi require unmodified thinset?
Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. Since KERDI is impervious, it does not deprive the mortar of its moisture. This allows the cement to properly hydrate, resulting in a strong, dense bond coat.
Can you use modified thinset under Kerdi membrane?
In general, modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Modified thin-set mortars must dry for the polymers to coalesce and form a hard film in order to gain strength.
Is Mapei premium mortar modified?
Polymer-modified, cement-based mortars such as MAPEI’s Large Tile & Stone Mortar are generally recommended for installing tile over radiant-heat systems. Refer to the written instructions of the radiant-heat manufacturer for recommendations of cement-based mortars.
Can you plaster over Kerdi-board?
If partial areas will not be tiled, you can simply cover Schlüter-KERDI-BOARD with a spackling compound or plaster.
Can I paint over waterproof membrane?
Painting your waterproof membrane may not be warrantied, but it is possible. Remember that you will have to use a good quality primer or an all-in-one paint for the best chance at success with your fresh coat of paint.
Is Kerdi fix paintable?
KERDI-FIX is odorless, weather- and UV-resistant. The product is elastomeric, free of solvents, and provides a strong bond to most materials, including wood, stone, concrete, metal, glass, and many synthetic materials. KERDI-FIX can be painted over with most alkyd resins or dispersion paint types.
Can you put Thinset over wood?
You can bond tile directly to wood with a flexible adhesive. … In any case, to bond tile to wood, you must use a flexible thin-set mortar with a latex additive. Wood shrinks and swells with humidity and frosts, which can break the bond between ordinary tile and thin-set.
Will Thinset adhere to wood?
Using Thinset To Stick Tiles To Wood Wall Thinset isn’t the perfect choice for sticking tiles on wood. Firstly, thinset is designed to work with concrete or stone tiles. … You can use glue or mastic to attach tiles and wood. They can even adhere to tiles on wooden surfaces like wooden sub-floor or backsplash.
