Key Takeways:
- uPVC awning windows hinge at the top, opening outward for ventilation even during rain
- Installation requires a 5–10mm expansion gap for frame alignment and thermal movement
- Proper sealing with silicone and expanding foam prevents drafts, leaks, and structural distortion
- Awning windows offer strong security, energy efficiency, and low-maintenance performance for residential and commercial projects
uPVC awning windows are one of the most versatile window types for modern buildings. Hinged at the top and opening outward from the bottom, they provide excellent ventilation, energy efficiency, and weather resistance. Their unique design allows airflow even in light rain while maintaining security and insulation.
This guide will walk you through the complete installation process from preparation and measuring to sealing and finishing so you can ensure a professional, long-lasting result whether you’re a DIY enthusiast or overseeing a larger project.
Understanding uPVC Awning Windows
Before installation, it’s helpful to understand what makes awning windows unique:
- Top-Hinged Mechanism – Bottom edge swings outward for ventilation.
- Weather Protection – Keeps interiors dry while allowing airflow.
- Energy Efficiency – Multi-chamber uPVC frames and double glazing reduce heat transfer.
- Security Features – Strong frames with multi-point locking systems.
- Design Flexibility – Suitable for residential and commercial applications.
Comparison: uPVC Awning Windows vs Other Popular Types
| Feature | uPVC Awning Windows | uPVC Casement Windows | uPVC Sliding Windows |
| Opening Style | Hinged at the top, opens outward from bottom | Side-hinged, opens outward/inward | Slides horizontally along a track |
| Ventilation | Allows airflow even in light rain | Provides full opening ventilation | Good for wide openings but less control over direction |
| Weather Resistance | Excellent, rain protection when open | Moderate, must be closed in rain | Depends on sealing; may allow drafts if not aligned well |
| Security | Strong with multi-point locking | Strong with proper locks | Moderate; can be forced if poorly maintained |
| Best For | Bathrooms, kitchens, commercial projects, rainy climates | Living rooms, bedrooms, where full opening is preferred | Limited spaces, modern designs, wide walls |
Tools and Materials Needed
- Tape measure
- Spirit level
- Drill and drill bits
- Screwdriver set
- Silicone sealant and applicator gun
- Expanding foam with foam gun
- Packers (plastic shims)
- Safety gear (gloves, goggles, dust mask)
Preparation and Measuring
- Measure the window opening’s height and width at three points each.
- Use the smallest measurement to avoid fitting issues.
- Allow for a 5–10mm expansion gap on all sides.
- Double-check that the new awning window matches the survey size and style.
Step-by-Step Installation Process
1. Remove the Old Window
- Remove interior trim and glazing where possible.
- Cut through sealant holding the frame in place.
- Carefully pry the old window from the wall, avoiding structural damage.
2. Prepare the Opening
- Clean out debris, dust, and old sealant.
- Repair damaged mortar or frame areas.
- Apply a waterproof membrane to block moisture.
3. Fit the Sill (Cill)
- Attach sill end caps with adhesive.
- Run a silicone bead along the sill upstand for water resistance.
- Fix the sill securely to the frame with screws.
- Seal joints at both ends for a watertight connection.
4. Position the New Frame
- Place the new awning frame into the prepared opening.
- Use packers to maintain level, square, and plumb alignment.
- Keep a consistent expansion gap.
- Drill fixing holes 150mm from each corner and at 600mm centers.
- Secure fixings with packers in place, without overtightening.
5. Install Glass and Hardware
- Remove glazing beads and clean the frame.
- Insert bridging packers to ensure drainage.
- Position the insulated glass unit securely with glazing packers.
- Refit glazing beads, starting with the shortest.
- Install handles, hinges, and locks as per manufacturer’s guide.
6. Insulate and Seal
- Fill expansion gaps with expanding foam.
- Trim excess foam after curing.
- Seal around the frame’s exterior using silicone for a weatherproof finish.
7. Finishing and Testing
- Reattach interior trim or architraves.
- Clean the frame and glass thoroughly.
- Test the window’s operation, ensuring smooth opening and locking.
- Add trickle vents if specified.
Best Practices
- Always follow the manufacturer’s guidelines.
- Use corrosion-resistant fixings suitable for the wall material.
- Double-check levels before tightening fixings.
- Leave allowance for thermal expansion.
- Maintain ventilation when using foams and sealants.
Common Mistakes to Avoid
- Overtightening screws, causing frame distortion.
- Skipping the expansion gap.
- Using poor sealing techniques, leading to leaks.
- Incorrect packer placement, affecting window performance.
- Neglecting waterproof membranes in moisture-prone areas.
Maintenance Tips
- Clean frames with mild soap and water.
- Lubricate hinges and locks yearly.
- Replace worn weatherstripping promptly.
- Keep drainage slots free of debris.
- Avoid painting uPVC frames, which can reduce performance.
Why Work with Oridow for uPVC Awning Windows
When sourcing uPVC awning windows for large-scale projects, choosing a trusted supplier is essential.
Oridow, a China-based aluminum and uPVC windows and doors manufacturer, provides:
- Custom fenestration systems for wholesalers, builders, architects, and distributors.
- International certifications ensure compliance with global standards.
- Tailored solutions for both residential and commercial applications.
- Competitive pricing and reliable supply chains for bulk procurement.
Discover durable, high-quality, and customizable solutions trusted by clients worldwide, explore the full range now at Oridow.com.
Conclusion
Installing uPVC awning windows enhances ventilation, security, and comfort while protecting interiors from rain. With proper preparation, precise installation, and regular maintenance, these windows will provide years of reliable performance. For wholesalers, builders, and architects looking for trusted suppliers, Oridow offers certified, custom solutions that combine quality with value.
