1. Product Overview
The Schluter DITRA5M is a polyethylene membrane designed as an uncoupling, waterproofing, and vapor management layer for ceramic and stone tile installations. It effectively neutralizes stress between the substrate and the tile covering, preventing cracking and delamination. The membrane also provides a reliable waterproofing layer, protecting moisture-sensitive substrates.
Key Features:
- Tile Cracking Prevention: Provides an effective uncoupling layer to neutralize stress between the substrate and tiles, preventing cracking and delamination.
- Multi-Surface Compatibility: Suitable for various substrates including concrete, plywood, OSB, and gypsum, and compatible with heated floors.
- Moisture Barrier: Made of polyethylene, this membrane protects moisture-sensitive substrates like plywood and OSB.
- Sturdy Foundation: Features a unique structure that supports and distributes heavy loads evenly, suitable for high traffic areas.
2. Safety Information
Always prioritize safety during installation. Wear appropriate personal protective equipment (PPE) including safety glasses, gloves, and dust masks. Ensure adequate ventilation when working with thin-set mortars. Follow all local building codes and safety regulations.
3. Required Tools and Materials
Tools:
- Notched Trowel (Schluter-DITRA trowel or equivalent recommended)
- Utility Knife
- Measuring Tape
- Mixing Bucket
- Drill with Mixing Paddle
- Grout Float
- Damp Sponge
Materials:
- Schluter DITRA Uncoupling Membrane
- Thin-Set Mortar (Modified for wood substrates, Unmodified for concrete substrates)
- Schluter KERDI-BAND (for sealing seams)
- Schluter KERDI-FIX (for sealing transitions to shower pans/bathtubs)
- Tiles
4. Surface Preparation
Ensure the substrate is clean, dry, and structurally sound. Remove any dust, debris, grease, or contaminants that could hinder adhesion. For wood subfloors, lightly dampen the surface with a sponge to prevent the subfloor from absorbing too much moisture from the thin-set mortar, which can affect its curing and bond strength.
5. Installation Guide
5.1 Applying Thin-Set Mortar to Subfloor
Apply the appropriate thin-set mortar to the prepared substrate using a notched trowel. For wood subfloors, use a modified thin-set mortar. For concrete subfloors, use an unmodified thin-set mortar. Ensure the thin-set is spread evenly, and all notches face one direction (directional troweling) to achieve proper coverage and embedment of the membrane's fleece webbing.
5.2 Laying the DITRA Membrane
Carefully unroll the Schluter DITRA membrane over the freshly applied thin-set mortar, ensuring the fleece webbing side is facing down into the mortar. Press the membrane firmly into the thin-set using a grout float or a roller to ensure full contact and remove any air pockets. This embeds the fleece into the mortar, creating a strong bond.
5.3 Sealing Seams and Transitions (Waterproofing)
For waterproofing, all seams between DITRA sheets and transitions to walls or other elements must be sealed. Apply unmodified thin-set mortar over the DITRA seams and embed Schluter KERDI-BAND, ensuring it is centered over the seam and fully encapsulated in the mortar. For transitions to shower pans or bathtubs, leave a 1/4 inch gap between the DITRA membrane and the vertical surface. Fill this gap with Schluter KERDI-FIX sealant, then embed KERDI-BAND into the KERDI-FIX and extend it onto the DITRA membrane, ensuring a watertight seal.
5.4 Tile Installation
Once the DITRA membrane is installed, apply unmodified thin-set mortar to the surface of the DITRA, ensuring the cut-back cavities (waffle pattern) are completely filled. Then, apply additional thin-set mortar to the back of the tiles (back-buttering) and set them into place. Ensure proper coverage and levelness. After the thin-set has cured, proceed with grouting the tile joints.
6. Maintenance
Regularly clean your tiled surfaces according to the tile and grout manufacturer's recommendations. Avoid harsh chemicals or abrasive cleaners that could damage the grout or tile finish. Proper maintenance helps preserve the integrity and appearance of your tile installation.
7. Troubleshooting
Common Issues:
- Loose or Hollow Tiles: Often caused by insufficient thin-set coverage or improper embedment. Ensure 100% contact between the tile and the thin-set, and between the thin-set and the DITRA membrane.
- Cracking Grout/Tiles: Can result from substrate movement not adequately managed. DITRA is designed to prevent this; ensure proper installation and use of recommended thin-set types.
- Water Penetration: Typically due to improper sealing of seams or transitions. Verify that KERDI-BAND and KERDI-FIX are correctly applied and fully embedded.
For persistent issues, consult a qualified tile installer or contact Schluter Systems technical support.
8. Specifications
| Attribute | Specification |
|---|---|
| Brand | Schluter |
| Model Number | DITRA5M |
| Material | Polyethylene |
| Thickness | 1/8 inch (approx. 3.2 mm) |
| Dimensions | 3 ft 3 in x 16 ft 5 in |
| Coverage | 54 Square Feet |
| Water Resistance Level | Waterproof |
| Installation Type | Thin-Set Mortar |
| Recommended Uses | Tile installations on various substrates, including concrete, plywood, OSB, and gypsum, and in both dry and wet areas. |
9. Warranty and Support
Warranty Information:
The Schluter DITRA5M is backed by a 10-year limited warranty against manufacturing defects when installed according to the Schluter Installation Handbook and Technical Data Sheet, following all guidelines and industry standards in effect at the time of installation.
Customer Support:
For technical assistance, product inquiries, or warranty claims, please contact Schluter Systems directly. Refer to the official Schluter Systems website or product packaging for the most current contact information.
