Choosing a roofing material is one of the most important decisions when building a house. Homeowners spend many weeks selecting the right profile, finish, or color for their roof tiles. However, the longevity of the entire structure, the optimal indoor microclimate, and the efficiency of the plumbing systems are often determined by details— system accessories that are almost imperceptible at first glance.
One of the key elements of this type are roof chimneys. Although small, they play a strategic role on the roof. In the case of systems based on high-quality swissporTON cement roof tiles (such as KAPSTADT, KIOTO, GÖTEBORG, or BREMA), the use of dedicated system chimneys guarantees not only trouble-free building operation but also the aesthetic consistency of the entire roof surface.
Flue models for swissporTON cement roof tiles
© swissporTON
Ventilation and vent chimneys—a key distinction
Many homeowners confuse the two basic types of roof-mounted chimneys. Although they may look similar, they differ in pipe diameter—vent pipes have a narrower diameter of 100 mm, while ventilation pipes have a diameter of 150 mm. They also serve completely different functions based on the principles of building physics:
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Venting chimneys (sewage chimneys)— are used to equalize pressure in the home’s sewage system and to vent sewage gases to the outside. Without proper venting of the riser, water draining from plumbing fixtures creates a vacuum that can “suck” water out of bathroom traps, leading to unpleasant odors in the home.
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Ventilation chimneys – serve as the terminations of gravity or mechanical ventilation ducts (e.g., from kitchen range hoods, bathrooms, or utility rooms). Their purpose is to efficiently remove stale, humid air from inside the building.
Construction of a vent for swissporTON cement roof tiles
© swissporTON
Why choose swissporTON system chimneys?
During finishing work, there is a temptation to use universal plastic substitutes. However, this solution carries significant technological and aesthetic risks. SwissporTON’s dedicated roof tile accessories offer a range of features that surpass those of universal solutions:
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Perfect seal and profile fit
System chimneys are designed precisely to match the specific shape of the cement roof tile—whether it’s the modern, flat KAPSTADT tile or the traditional GÖTEBORG profile. The base of the chimney system fits perfectly with the adjacent roof tiles, eliminating the risk of rain or snow being blown under the roof or leaks forming in the roofing layer. -
Material consistency and high UV resistance
Universal plastic chimney caps fade over time due to sun exposure, lose their elasticity, and become susceptible to mechanical damage (e.g., hail impacts). Dedicated system solutions for swissporTON cement roof tiles are based on the same technological solutions as those used for flat roof tiles, ensuring uniform material aging, color consistency, and resistance even to harsh weather conditions. -
Aerodynamics and Protection Against Condensation
A high-quality swissporTON ventilation chimney features a well-designed internal structure that prevents air from flowing backward in strong winds (so-called backdraft). Additionally, it drains any condensed moisture to the outside, protecting the roof’s thermal insulation from moisture and ensuring free airflow in accordance with building codes.
Ventilation chimneys for swissporTON cement roof tiles
© swissporTON
A well-thought-out design that protects your home
The reliability and longevity of the swissporTON chimney system stem directly from its well-thought-out, modular construction. Every detail has been designed to eliminate the most common problems found in generic replacement chimney systems.
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The cement base perfectly matches the shape of the roof tile, ensuring a precise fit into the roof surface without the need for cutting or sealing with silicone. By eliminating gaps, we gain reliable protection against rainwater infiltration, melting snow, and leaks into the roof interior.
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The cement ventpipe creates an exceptionally stable and deformation-resistant ventilation channel. Resistance to wind pressure and temperature fluctuations ensures a consistent flow cross-section, which results in efficient ventilation of the system and the absence of unpleasant odors in bathrooms.
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The ceramic cap effectively covers the pipe’s outlet from above, protecting the interior of the duct from rain, leaves, and birds nesting while maintaining full airflow capacity. Additionally, the ceramic finish gives the entire component a refined and sophisticated appearance that harmonizes perfectly with the roof covering.
All components are securely joined. The connection point between the base, the pipe, and the cap is exceptionally tight and stable. This protects the chimney from damage or detachment caused by gusty winds, hail, or heavy snow, ensuring maintenance-free operation for decades.
Impact on the durability and “health” of the roof truss
A lack of proper ventilation or leaks at the points where the chimney penetrates the roof deck are the most common causes of moisture buildup in insulation layers (PIR boards, such as swissporPIR, swissporEPS, or wool). Moisture significantly reduces a building’s thermal insulation properties and creates an ideal environment for the growth of fungi and mold, which over time weakens the wooden roof truss structure.
Using a complete system—swissporTON cement roof tiles along with dedicated roof vents and RBF roll flashing tapes —creates a barrier that protects the building for decades.
A roof chimney is an investment in the safety and durability of the entire roof. When choosing swissporTON cement roof tiles, it’s worth opting for the full system of dedicated accessories. This ensures not only a perfect appearance of the roof surface without any visibly mismatched elements, but above all, peace of mind for years to come and efficient ventilation throughout the entire home.
Learn more on the swissporTON website.
For more information, visit the Swisspor Polska company page on the PdA portal.
