A properly selected threshold – matched to a PVC or timber frame – helps reduce heat loss, protects against moisture, dust, and noise, and better withstands weather conditions.
See why a properly designed and correctly installed COMBI system eliminates problems before they even occur – reducing heat loss and the risk of costly complaints.
Why is the threshold zone so important?
Many investors treat the threshold as an “accessory” to the construction. Meanwhile, this is exactly where installation errors, air leaks, mechanical damage, or thermal bridges occur most easily (especially under intensive use and exposure to weather conditions).
Replacing traditional wooden thresholds with a modern profile significantly improves durability and makes maintenance easier (less abrasion).
The right threshold and its proper installation have an impact on:
- thermal comfort inside the rooms
- the durability of the door and the floor
- compliance with regulations (e.g., WT2021)
- a lower number of complaints after purchase and installation
That is why our offer includes the COMBI system – a solution adapted to various applications, which eliminates the source of problems and is characterised by high manufacturing quality.
What are COMBI and COMBI PLAN?
COMBI 20 mm eng
A modular aluminium and PVC door threshold used in patio, balcony, entrance, single- and double-leaf doors, opening both inward and outward. Thanks to its compatibility with timber and the Dutch system, it offers wide application possibilities. It is easy to install and resistant to common mistakes that generate complaints.
Combi Plan 00 mm
The barrier-free version, ideal for modern interiors, apartments, and accessible construction. It allows a flush, floor-level transition – with no thresholds or steps – while maintaining durability and tightness.
Both solutions are compatible with the profile systems of leading manufacturers, which means simple integration in the production process and the possibility of using one system for different types of doors. This significantly simplifies threshold selection and standardises the product offer.
Proven COMBI performance
The COMBI threshold system has been tested in renowned institutes and features parameters that directly influence the durability of doors and user comfort:
- Water tightness: up to class E900 (DIN EN 1027) – the threshold remains resistant to heavy rainfall and extreme weather conditions, protecting the interior from moisture and heat loss
- Air permeability: class 4 (DIN EN 1026) – ensures tightness and a stable indoor microclimate
- Wind resistance: class C3 – ensures safety and structural stability even during strong gusts
- Burglar resistance: RC2/RC2N (DIN EN 1627:2011) – protects homes and buildings against unauthorised access
- Quality certificates: PIV, IFT Rosenheim – confirm the system’s reliability and compliance with European standards
Importantly, COMBI maintains full tightness without the need for milling the frame – in both PVC and timber profiles. This means a simpler production process, lower risk of installation errors, and predictable quality in every project.
Barrier-free accessibility and safety
The COMBI PLAN system provides a 0.0 mm transition – with no steps and no conflicts with the floor finish. It is an ideal solution for accessible construction, modern apartments, and interiors where everyday comfort matters.
The absence of barriers allows elderly people, children, and wheelchair users to move freely – without compromising tightness or weather resistance.
For greater functionality, we also offer SAFE STOP – a magnetic stop for the passive leaf. It is fully flush with the construction, which means it does not affect the aesthetics while providing protection and making installation easier.
Fewer errors. More predictability.
The well-designed COMBI construction:
- shortens installation time and simplifies the entire process
- eliminates the risk of frame deformation and improves durability
- allows you to standardise a single door threshold for many door types – entrance, balcony, or outward-opening
- makes it easier to obtain CE marking, highlighting high quality and compliance with European standards
For the manufacturer, this means fewer complaints, lower service costs, and greater predictability at the purchase and operation stage.
For the user – cleanliness, no issues with threshold abrasion, and long-term comfort.
Practical example: PARTNER-ALMA
PARTNER-ALMA from Limanowa tested a double-leaf construction with a floating mullion (Aluplast 8000 system) using the COMBI threshold.
The result? 9A (600 Pa) tightness confirmed in a mobile test chamber. Our technical consultant supported the installation process and provided full certification documentation.
Conclusion: Tightness starts with the details
At Alumaster, we believe that it is the details that determine market advantage.
That is why our thresholds are suited not only for apartments, but also for single-family homes and public buildings.
The COMBI system was designed to ensure cleanliness, comfort, and durability in all conditions:
- for the manufacturer – fewer complaints, easier certification, and predictable costs
- for installers – faster and simpler installation regardless of the door type
- for users – thermal and acoustic comfort indoors, no barriers, and easier maintenance
Thanks to this, COMBI combines high quality with cost efficiency – a solution beneficial both in terms of durability and total cost of ownership.
We invite you to contact our technical consultant – we will help you choose the right system and demonstrate the differences using concrete figures.
