A poorly planned conservatory overheats like a greenhouse in summer, suffers condensation in winter and leaks in the rain. We explain what you need to know about profiles, glass, roof pitch, ventilation and drainage.
A conservatory turns a terrace, a corner of the garden or a top floor into a light-filled living space usable all year round. In detached houses around Ortaca, Köyceğiz and Fethiye, these structures that connect the garden with the interior are increasingly popular. But a conservatory is not just an area enclosed with glass. If heat balance, glass choice and especially water management are not designed correctly, it becomes unusable in summer due to the greenhouse effect, the glass sweats in winter, and water starts dripping from the roof at the first downpour. In this article we explain the basics of a healthy conservatory.
Structural system and profile choice
Conservatories are usually built with aluminium structural systems. Aluminium can span wide openings with slim sections and carry heavy glass loads. Thermally broken (insulated) profiles must be used for thermal insulation; aluminium without a thermal break creates a cold bridge in winter, causing condensation on the profile surface. uPVC systems can also be used for side walls and opening sashes, but the roof structure generally requires aluminium or steel-supported systems.
The structural system must be engineered for the local wind load and glass weight. For buildings near the coast, anodising or electrostatic powder coating suitable for marine environments should be chosen as the surface treatment.
Glass choice: managing the greenhouse effect
Glass is the most important factor in conservatory comfort. During Muğla summers, a conservatory built with the wrong glass can be much hotter than the interior at midday.
- Roof glass: For safety, laminated glass must always be used in the roof; if broken, the fragments stay in place thanks to the interlayer. An insulated glass unit with a toughened outer pane and laminated inner pane is usually preferred.
- Solar control coating: Solar control and Low-E coated glass on the roof and south-west facades keeps a large part of the sun’s heat outside.
- Side glazing: Toughened or laminated glass is necessary for safety in floor-to-ceiling panes.
- Warm-edge spacer: Reduces condensation at the glass edge in winter.
Ventilation and shading
However good the glass, ventilation is essential to expel hot air. Since hot air rises, opening windows or vents at roof level are the most effective solution. Used together with lower opening sashes, they create a natural airflow. Motorised roof windows can work automatically with temperature and rain sensors.
Shading is at least as important as the glass. External awnings or rooftop sun shading are far more effective than internal blinds because they stop the sun before it reaches the glass. External shading is recommended for conservatories that receive intense sun in Dalaman and Ortaca in summer.
Drainage and waterproofing: the most critical issue
The most common complaint with conservatories is water leaks, usually caused by roof and drainage details. A sound system takes the following into account:
- Roof pitch: Sufficient pitch must be provided so that rainwater and dust do not collect on the roof. On low-pitched glass roofs, water and dirt accumulate and gasket life is shortened.
- Internal drainage channels: Quality conservatory profiles have stepped internal drainage channels that collect water passing the gaskets or condensing, and direct it outside.
- Gutter and downpipe: Water from the roof must be carried away from the building by a gutter and downpipe of sufficient capacity. Given the sudden, heavy downpours in the region, gutter capacity should not be undersized.
- Wall junction: Waterproofing and flashing at the point where the conservatory meets the building wall must be done with care. Most leaks originate at this junction.
- Floor and threshold: The floor should be raised above the outside garden level and waterproofing applied beneath the threshold.
| Topic | Wrong approach | Right approach |
|---|---|---|
| Profile | Aluminium without thermal break | Thermally broken aluminium system |
| Roof glass | Plain or only toughened glass | Insulated unit with laminated inner pane, solar control coating |
| Roof pitch | Almost flat | Enough pitch for water to run off |
| Ventilation | Side sashes only | Roof-level opening vents plus lower sashes |
| Drainage | Sealing with silicone only | Internal drainage channels, adequate gutter, wall junction detail |
Condensation and winter use
If the glass sweats in winter, indoor humidity is high, ventilation is inadequate, or glass and profile insulation are weak. If the conservatory contains many plants, humidity naturally rises. Regular short airing, thermally broken profiles and insulated glass with warm-edge spacers greatly reduce condensation. For heating, underfloor heating or heaters placed in front of the glass help prevent condensation by raising the glass surface temperature.
Permits and planning
Since a conservatory is an enclosed area added to the building, it may need to be assessed under zoning regulations. Consulting the municipality at the design stage prevents problems later. In buildings within a complex, the management plan and the decision of the flat owners should also be taken into account.
Conclusion
The secret of a successful conservatory is planning thermally broken profiles, the right glass, adequate ventilation and shading, and a flawless drainage detail together. When one of these is missing, the structure either overheats in summer or develops water problems. If you are planning a conservatory, our team offers a free site survey and measurement, assessing facade orientation, roof pitch and drainage details on site to recommend a suitable system.
