LATICRETE

9235 Waterproofing Membrane

Liquid membrane (DS-236-0420) · US · not yet reviewed

Check your container: This countdown is for the Liquid membrane (DS-236-0420) variant. Similar-looking versions may have different times.

How long before you can flood test LATICRETE 9235 Waterproofing Membrane?

Short answer

Ready to flood test: 7 days after application.
Ready for another coat: 1–3 hours after application.
Grout & tile mortar

Return-to-use gates

Open the surface gradually instead of treating cure as one moment

Touch / inspectA surface check only
Foot trafficUse the stated walking time
Heavy useWait for furniture, water or vehicle readiness

Calculate return-to-use time

When was the material placed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Ready for another coat1–3 hours
  • Ready to flood test7 days
  • Rain-safe5 days
  • Curing period complete7 days

From LATICRETE data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: laticrete.com

Conditions & fine print
  • Stated conditions: 70°F (21°C) and 50% relative humidity
  • Thin-set tile or stone can be installed once the membrane has dried to the touch; the data sheet gives no minutes for that. New concrete slabs must be damp cured and at least 14 days old; wet mortars need 7 days at 70°F. Do not leave unprotected membrane exposed to sun or weather for more than 30 days.
  • Temperature range: 45°F to 90°F
  • Region US. Formulas can differ between countries; check your container.
  • Ready for another coat: At 70°F (21°C) and 50% relative humidity.
  • Ready to flood test: At 70°F (21°C) and 50% relative humidity. Cold and wet conditions need longer.
  • Rain-safe: At 70°F (21°C) and 50% relative humidity.
  • Curing period complete: At 70°F (21°C) and 50% relative humidity.
  • Entered from the manufacturer source; second review pending. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Using this specific product

LATICRETE 9235 Waterproofing Membrane is listed here as the Liquid membrane (DS-236-0420) version for shower, waterproofing, and membrane. For grouting tile, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says Liquid membrane (DS-236-0420); related versions can use different timing.
  • For shower, waterproofing, and membrane, pay particular attention to joint depth, water ratio, cleanup and room conditions.
  • At 70°F (21°C) and 50% relative humidity. At 70°F (21°C) and 50% relative humidity. Cold and wet conditions need longer.

How to check readiness

Inspect shaded joints and verify the stated water or traffic milestone. Before recoating, confirm the first coat matches the manufacturer’s stated condition; if the maximum window passed, check whether sanding is required. Allow the membrane to cure fully before flood testing, typically 7 days. Use this only as the rainfast milestone. It does not establish general cure or re-entry safety.

Avoid this mistake

Color change alone does not prove the joint is ready for immersion.

Questions

How long before you can flood test this product?

LATICRETE states: Let the topcoat dry to the touch, approximately 1 to 3 hours, before the next step. Conditions: At 70°F (21°C) and 50% relative humidity.. Allow the membrane to cure fully before flood testing, typically 7 days. Conditions: At 70°F (21°C) and 50% relative humidity. Cold and wet conditions need longer.. Protect the membrane from rain or water for a minimum of 5 days. Conditions: At 70°F (21°C) and 50% relative humidity.. Cure 7 days before covering with thick bed mortar, screeds or similar coverings. Conditions: At 70°F (21°C) and 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

How long before I can apply a second coat of this product?

LATICRETE states: Let the topcoat dry to the touch, approximately 1 to 3 hours, before the next step. Conditions: At 70°F (21°C) and 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

How long before this product can get rained on?

LATICRETE states: Protect the membrane from rain or water for a minimum of 5 days. Conditions: At 70°F (21°C) and 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

What affects how long this product takes to dry or cure?

Thin-set tile or stone can be installed once the membrane has dried to the touch; the data sheet gives no minutes for that. New concrete slabs must be damp cured and at least 14 days old; wet mortars need 7 days at 70°F. Do not leave unprotected membrane exposed to sun or weather for more than 30 days. Follow the product label for your conditions.

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