The Complete Guide to Waterproofing Accessories: Fasteners, Tapes, and Flashing
A waterproofing system is only as strong as its weakest component. While the membrane or coating gets most of the attention, the accessories — fasteners, tapes, termination strips, and prefabricated corners — are equally critical to a watertight result.
This guide explains the essential accessories every waterproofing professional should know about.
1. Membrane Fasteners (Washers and Screws)
For mechanically attached roofing systems, fasteners hold the membrane in place against wind uplift.
Types:
- Dach-fix TD Washers — Large-diameter washers (60-70 mm) with EPDM bonded seals for watertight fastening
- Dach-fix IC/IB/IS Washers — Designed for insulation and substrate-specific applications
- Self-drilling screws — TP-fix, P-fix, and HS series for steel deck, concrete, and wood substrates
Selection tip: Match the fastener length to the total thickness of insulation + membrane. The screw must penetrate the structural deck by at least 15-20 mm.
2. Termination and Edge Strips
Termination strips secure membrane edges at roof perimeters, parapets, and wall junctions.
Popular profiles:
- S-fix FTIII — Heavy-duty termination strip for exposed roof edges
- S-fix FTII — Standard termination for wall flashings
- S-fix UR — Universal profile for various detail applications
Installation: Position the strip over the membrane edge, drill through the pre-punched holes, and fasten at 200-300 mm intervals. Apply sealant over the top edge.
3. Vapor Retarder Tape
Vapor retarder tape is used to seal overlaps and penetrations in vapor control layers.
Application areas:
- Sealing membrane side laps and end laps
- Around pipe and cable penetrations
- At membrane-to-metal or membrane-to-concrete transitions
- Repairing minor membrane damage
Tip: Apply tape with firm roller pressure and at temperatures above 5°C for optimal adhesion.
4. Prefabricated Corner Pieces
Inside and outside corners are the most leak-prone areas in any waterproofing system. Prefabricated corners eliminate the guesswork.
Benefits:
- Factory-formed to exact angles
- Consistent thickness and material properties
- Faster installation than field-fabricated corners
- Reduced risk of leakage
5. Lightning Conductor Supports
Flat roofs often require lightning protection systems. Special membrane-compatible supports prevent water penetration at lightning rod mounting points.
Features to look for:
- EPDM or neoprene base seals
- Adjustable height for insulation thickness
- Compatibility with standard lightning cable clamps
6. Sealants and Primers
These chemical accessories ensure proper adhesion and sealing:
- Bitumen primer — Enhances bonding of bitumen membranes to substrates
- PU sealant — For sealing edges, joints, and penetrations
- Butyl tape — For temporary sealing or non-critical joints
Choosing the Right Accessories
| Accessory | When to Use | Key Feature |
|---|---|---|
| Dach-fix TD Washer | Mechanically attached membrane on flat roofs | EPDM seal, high pull-through resistance |
| S-fix FTIII Strip | Roof edge termination | Pre-punched, corrosion-resistant aluminum |
| Vapor Retarder Tape | Sealing membrane overlaps | High initial tack, long-term adhesion |
| Prefabricated Corner | Inside/outside corners of sheet membranes | Factory-formed precision |
| Lightning Support | Roofs with lightning protection | Waterproof base plate |
Conclusion
Professional waterproofing relies on quality accessories as much as quality membranes and coatings. By using the right fasteners, strips, tapes, and prefabricated components, you ensure that your waterproofing system performs reliably for decades.
Hongyuan Waterproof offers a complete range of compatible accessories — from Dach-fix washers and S-fix strips to tapes and prefabricated corners. Systems that are designed together work better together. [Browse our accessories] or request a catalog.