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At a Glance: Key Applications
Use Waterstop Doorline for: Creating seamless wet area entries in screeded floors while maintaining waterproofing integrity and visual continuity with Streamline showers.
Waterstop Doorline: A Technical Overview
Waterstop Doorline is a precision aluminium door sill extrusion designed specifically for wet area transitions in screeded or bedded floors. Its bullnose profile delivers a clean, modern appearance while matching seamlessly with Waterstop Streamline shower systems. The internal serrated surfaces of both horizontal and vertical legs provide enhanced grip for adhesives and membranes, ensuring durable installation and consistent waterproofing performance. Available in 40mm or 50mm heights and two popular finishes — Bright Silver and Matt Black — Doorline is easily cut to length onsite, making it ideal for both new builds and bathroom renovations.
Core Features & Specifications
- Modern bullnose profile enhances aesthetic and safety at wet area entries.
- Internal vertical leg includes serrated face for superior membrane adhesion.
- Horizontal base features serrated underside to increase glue contact area.
- Protective tape applied to visible face prevents damage during construction.
- Cut-to-fit onsite with a standard hacksaw — no special tools required.
- Supplied in 1 metre or 3 metre lengths; 40mm or 50mm height options.
- Finish options: Bright Silver or Matt Black to match popular design palettes.
The Waterstop Doorline Advantage
- Achieve a premium, uninterrupted wet area entry with matching finishes across the shower perimeter.
- Supports consistent membrane detailing for compliance and leak prevention.
- Reduces jobsite risks thanks to a safer curved profile and tamper-resistant design.
- Onsite flexibility reduces material waste and accommodates design adjustments.
- Quick to install — ideal for high-efficiency builders and renovators.
Storage & Shelf Life Considerations
Store Doorline extrusions in a dry, covered area protected from scratches or impact. Avoid long-term exposure to corrosive environments prior to installation to preserve the integrity of the finish.
Certifications & Regulatory Compliance
While not a waterproofing membrane itself, Waterstop Doorline is engineered to integrate with compliant systems and supports AS/NZS 3740-compliant detailing when installed alongside certified membranes.
Frequently Asked Questions About Waterstop Doorline
Q: Can Waterstop Doorline be installed over a tiled floor?
A: No, Waterstop Doorline is designed to be installed prior to tiling. It integrates with the screed and waterproofing membrane beneath the tiles, ensuring a watertight and flush finish at the wet area entry.
Q: Is a primer needed before bonding Doorline to the substrate?
A: In most cases, no primer is needed. The serrated base enhances adhesive contact on standard screeds. However, ensure the substrate is clean, dry, and free from dust or contaminants for optimal adhesion.
Q: How do I cut Doorline to length on site?
A: Waterstop Doorline can be trimmed using a standard hacksaw. For a clean finish, use a fine-tooth blade and de-burr the cut edges prior to installation to prevent damage to membranes or finishes.
Q: Does Doorline need to be installed before waterproofing?
A: Yes, Doorline must be installed prior to waterproofing. The vertical serrated leg is designed for membrane adhesion, which is a critical part of the system to ensure watertight performance.
Q: What’s the difference between the 40mm and 50mm Doorline options?
A: The height difference allows flexibility based on screed depth or desired step profile. 40mm suits standard applications, while 50mm provides additional coverage for thicker screeds or elevated transitions.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Wet area entry transition in bathrooms | Provides a safe, stylish sill profile with built-in waterproofing compatibility | Builders, Waterproofers |
| Matching extrusion for Waterstop Streamline showers | Creates a cohesive visual line around the wet area perimeter | Bathroom Designers, Renovators |
| Screeded or bedded floor installations | Easily integrates into common wet area substrates with strong adhesion | Tilers, Waterproofers |
| Onsite trim-to-fit installation | Minimises waste and allows real-time jobsite adjustments | General Contractors |
Applying Waterstop Doorline: Protocols & Best Practices
General Application Steps:- Preparation: Ensure the substrate is clean, dry, and prepared as per the Adhesion & Preparation Guide. Measure and cut Doorline to required length using a fine-tooth hacksaw. Dry-fit before bonding.
- Application: Apply a bead of high-grip construction adhesive along the serrated base of the extrusion. Press Doorline firmly into place. Use weights or tape to hold it until the adhesive sets.
- Waterproofing: Once set, apply waterproofing membrane directly onto the serrated vertical face, ensuring full coverage and adhesion.
- Tiling: Proceed with tiling once membrane is fully cured. Align tiles flush with the Doorline for a seamless finish.
For Builders: Bathroom Entry with Screeded Floor
The Engineering Challenge: Maintaining membrane continuity while achieving a clean tile finish at the bathroom threshold.
The System-Based Solution with Waterstop Doorline: The serrated vertical leg anchors the membrane, while the bullnose face aligns with tile edges for a consistent visual line and waterproof barrier.
Best Practice Note: Apply waterproofing to the vertical leg before setting floor tiles to avoid membrane bridging gaps.
For Waterproofers: Ensuring Bond to Extrusions
The Engineering Challenge: Membranes pulling away from door thresholds over time due to poor mechanical grip.
The System-Based Solution with Waterstop Doorline: Serrated faces enhance mechanical interlock, giving superior anchorage for both liquid and sheet-applied membranes.
Best Practice Note: Apply membrane in multiple coats or with reinforcing mesh over the serrations to maximise hold.
Limitations & Safety
Product limitations and safety information
Limitations:
- Not suitable for direct installation over tiled or pre-finished floors — must be installed before waterproofing and tiling.
- Extrusion must be secured using a compatible construction adhesive — mechanical fasteners are not recommended as they may interfere with membrane integrity.
Safety & Handling:
- PPE: Gloves and eye protection recommended during cutting.
- Ventilation: Ensure good ventilation when using adhesives or membranes in enclosed areas.
- Handling: Use caution when cutting — de-burr all
Waterstop Doorline Adhesion & Preparation Guide
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Substrate preparation guidelines
- Screeded Floor: Ensure screed is clean, fully cured, and free from dust or laitance. Sweep and vacuum thoroughly before applying adhesive. - Primer: No primer required.
- Concrete Slab: Surface should be dry and free from oil, curing agents, or surface contamination. Abrade if necessary. - Primer: Not typically required when using high-performance polyurethane or construction adhesives.
- Fibre Cement Sheeting: Wipe with damp cloth to remove dust, ensure substrate is stable and fixed. - Primer: Optional depending on adhesive manufacturer's recommendation.
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