Schluter Systems DITRA-DRAIN-STU Self-Adhesive Joint Tape, Ensures Complete Coverage for Abutting Joints in DITRA-DRAIN Mats - 3-1/2" x 98' 5" (STUVKB90/30M)

Product Features:

• Self-Adhesive Waterproofing Tape: Self-adhesive waterproofing tape designed for Schluter DITRA-DRAIN membranes and other Schluter waterproofing systems, especially at cut edges.
• 98' 5" Seam-Sealing Coverage: 3-1/2" wide x 98' 5" long roll provides ample coverage for sealing seams, cut edges, overlaps, and transitions between membranes throughout the assembly.
• Watertight Joint Protection: Forms a watertight connection at joints to ensure complete long-term waterproof protection under tile and stone coverings at abutting mat seams.
• Quick Peel-and-Apply Installation: Quick and easy installation without additional mortar or adhesive, simply peel, apply, and press for instant sealing while saving valuable job-site time.
• Flexible Crack Prevention: Durable and flexible construction accommodates substrate movement, ensuring long-term tile crack prevention and vapor control.
• Versatile Wet-Area Applications: Ideal for wet-area applications such as showers, bathrooms, steam rooms, wet rooms, balconies, and exterior terraces, including outdoor stairs.
• Membrane Compatibility: Compatible with Schluter tile waterproofing membranes including DITRA-DRAIN, KERDI, and other tile installation systems for all projects.
• Professional-Grade Waterproofing: Suitable for residential and commercial projects, providing professional-grade waterproofing performance and reliability for indoor and outdoor tile work.
• Premium Quality: Made by Schluter Systems, a global leader in tile installation, waterproofing, drainage membrane, and uncoupling technology for professional tile assemblies.
• Complete Watertight Assemblies: Essential accessory for creating complete, watertight, and maintenance-free shower, drainage, and tile flooring projects with properly detailed joints.
  

Product Description:

The Schluter DITRA-DRAIN-STU Self-Adhesive Sealing Tape is a premium waterproofing accessory specifically engineered for use with Schluter DITRA-DRAIN uncoupling and drainage membrane installations. Measuring 3-1/2 inches in width and 98 feet 5 inches in length, this high-performance sealing tape ensures a long-lasting, watertight bond between adjacent sheets of membrane. It provides dependable waterproof protection in tiled areas such as showers, wet rooms, steam rooms, balconies, and terraces. For full functionality of the DITRA-DRAIN matting system, abutting seams between individual matting elements must be completely covered. DITRA-DRAIN-STU is especially useful at cut edges where the DITRA-DRAIN sheet no longer has its lateral fleece edge, allowing exposed membrane edges to be properly joined and finished within the drainage assembly.

Designed with a self-adhesive backing, DITRA-DRAIN-STU eliminates the need for additional bonding compounds or thin-set mortars, simplifying installation and saving valuable time on the job site. Its reliable adhesion forms a continuous waterproof layer at all seams and overlaps, ensuring full moisture protection and vapor control under tile and stone coverings. Before installing the DITRA-DRAIN membrane system, the substrate should be level, load bearing, clean, and compatible with the installation materials. Any required leveling, height adjustment, or slope correction should be completed beforehand, and bonded waterproofing assemblies must provide an adequate drainage slope. These preparation steps help support dependable installation over properly prepared floor and tile substrates in demanding wet-area and exterior applications.

As part of the complete Schluter waterproofing and uncoupling system, this sealing tape is used to secure transitions between DITRA-DRAIN membranes, creating an integrated, maintenance-free installation that protects substrates from water damage and cracking caused by substrate movement. DITRA-DRAIN 4 is installed into a suitable dry-set mortar using a 6 x 6 mm notched trowel, while DITRA-DRAIN 8 typically uses 3 x 3 mm or 4 x 4 mm notching. Pre-cut sheets are embedded into the applied tile adhesive and immediately pressed firmly in place with a float or roller while observing the adhesive curing requirements. DITRA-DRAIN 4 should also be checked after installation to confirm that its inverted truncated pyramid chambers are properly filled with mortar.

Schluter DITRA-DRAIN-STU is ideal for both residential and commercial tile projects where maximum durability, flexibility, and waterproofing reliability are required. Suitable for indoor and outdoor applications, this self-adhesive joint sealing tape is compatible with Schluter membranes, waterproofing sheets, and shower systems, making it a perfect choice for professionals seeking top performance, quality, and long-term protection in every tile installation. For exterior stair installations, DITRA-DRAIN 8 can provide stress relief between the substrate and tile covering while channeling accumulated water through the drainage layer and protecting the KERDI 200 bonded waterproofing assembly. Proper drainage must remain open at the bottom of the stairs, while suitable Schluter BARA edging profiles, DILEX movement-joint profiles, and appropriate stair nosing profiles can be incorporated where required for properly detailed transitions and exposed edges.

After the DITRA-DRAIN drainage mat has been securely embedded and the necessary cut-edge joints have been detailed, tile or natural stone coverings can be installed using the thin-bed method. The trowel notch should correspond to the selected tile format, and all ceramic tile, porcelain tile, floor tile, stone tile, marble tile, granite tile, or other suitable natural stone coverings must be solidly embedded in the tile adhesive. Installed areas should be protected from damage or detachment during construction, with running boards used where material traffic is expected and additional protection from direct sunlight or precipitation provided for exterior projects when necessary. Once the covering is able to bear weight, it can be grouted with a suitable material, while exterior thin-bed mortar and coverings must be waterproof and weather resistant. Properly planned perimeter, edge, transition, and movement joints help complete a durable tile installation, shower waterproofing, waterproofing membrane, drainage membrane, and uncoupling system designed for reliable long-term performance.