The thin-set mortar used for bonding KERDI must be appropriate for the substrate, and it must penetrate and engage the KERDI fleece. Generally, Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar is used.
What size notched trowel should I use to install Schluter™-KERDI? A 1/4″ x 3/16″ (6 mm x 5 mm) V-notched trowel or the Schluter™-KERDI-TROWEL is recommended.
What Thinset do I use for Kerdi membrane?
Schluter’s recommendation is to use unmodified thinset mortar when installing Kerdi over most shower substrates.
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.
How far apart should screws be on Kerdi board?
Only use Schluter screws and washers to attach KERDI-BOARD to the studs. Furthermore, the maximum on-center spacing for the screws and washers is 12 inches. KERDI-BOARD is one of my favorite waterproofing boards because it’s light, easy to cut and has lines on it for aligning the screws.
How thick is Kerdi membrane with thinset?
The material is physiologically safe and does not require special disposal. KERDI is 8-mil thick and has a water vapor permeance of 0.90 perms, when tested according to ASTM E96, using Procedure E at 90% relative humidity.
Will Thinset stick to Kerdi fix?
Kerdi fix does not stick to thin-set FYI. So if you pre-treated the backs you just ruined the corner.
Can I use modified thinset on Kerdi board?
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.
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.
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.
Can you install KERDI-BOARD directly on studs?
KERDI-BOARD is quick and easy to install as a substrate for tile coverings over wood or metal framing, and can be used vertically as well as horizontally with panel joints on the studs.
Can KERDI-BOARD go directly on studs?
The 1/2″ thick (12.5 mm) KERDI-BOARD can be applied over existing gypsum or masonry walls, wood stud framing, and other finished wall surfaces for bathtub and shower surrounds.
Can Kerdi membrane be installed over cement board?
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).
What size notched trowel for 12×24 tile?
¼ inch x ⅜ inch square notch trowel
This sized notch trowel is also great for installing 12x12s, 13×13’s, and 16×16’s. Additionally, I like to use this size trowel for the bigger “subway” tiles such as the 4×12’s and 4×16’s.
What happens if you don’t let the Thinset slake?
If you do not put the mortar to slake, the mix will have dry polymers. The dry polymers will leach water from the cement and cause it to stiffen up quickly. Allow the additives to dissolve fully to have a proper mortar mix.
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