Round Window Installation: A Step-by-Step Guide
Round windows add a unique and elegant touch to any home, providing both aesthetic charm and functionality. Unlike standard rectangular windows, a round window installation requires careful planning and precision. Whether you’re replacing an old window or installing a new one, this guide will walk you through the process step by step.
Why Choose a Round Wooden Window?
Round wooden windows are a beautiful architectural feature that can enhance both traditional and modern homes. Wood is a durable, natural material that provides excellent insulation and complements a variety of design styles. Whether used as an accent window in a living room, hallway, or attic, a round window installation can bring in natural light while maintaining energy efficiency.
Tools and Materials Needed for your Round Window Installation
To Install a round window, before starting, gather the necessary tools and materials:
Tools:
- Measuring tape
- Level
- Pencil or marker
- Jigsaw or reciprocating saw (for cutting the opening)
- Drill with appropriate bits
- Screwdriver
- Caulking gun
Materials:
- Round wooden window
- 10cm Screws
- Wood shims
- Window flashing tape
- Expanding foam insulation
- Exterior-grade caulk
- Interior and exterior trim (if needed)
Step-by-Step Guide to Installing a Round Wooden Window
1. Prepare the Opening
If you install a round window in a new location, you’ll need to cut an opening in the wall. If replacing an old window, carefully remove it while preserving the surrounding structure.
- Measure the Window Size
- Measure the exact diameter of your round wooden window.
- Mark the center point on the wall where you want to install it.
- Use a compass or a template to draw the outline of the window.
- Cut the Opening
- Using a jigsaw or reciprocating saw, carefully cut along the outline.
- Ensure the edges are smooth and even. Cutting a new opening should be carried out by a professional to avoid damage to the structure of the house.
- Install studs
- As shown in the image below, install diagonal studs which will act as fixing points for your screws. If you have a masonry opening the you will not need to install studs, but make sure there are strong fixing points in these areas for the screw plugs to secure into
2. Install Flashing and Weatherproofing
To prevent leaks, proper waterproofing is essential:
- Apply Window Flashing Tape
- Stick flashing tape around the rough opening, overlapping it for full coverage.
- Ensure the bottom section is installed first, followed by the sides, and then the top.
- Seal with Caulk
- Apply a generous bead of exterior-grade caulk around the opening to create a watertight seal.
3. Position the Window in Place
- Dry Fit the Window
- Before your final round window installation, place the window into the opening to check the fit.
- Make sure it sits evenly and aligns correctly.
- Use a level to make sure the lowest part of the window that sheds the rain is positioned directly at the bottom. Make a temporary mark on the window and wall to make sure they line up easily during the real installation
- Use Shims for Leveling
- Insert wood shims around the window frame to keep it level and secure.
- Use a level to confirm proper positioning.
4. Secure the Window
- Fasten the Window to the Frame
- Drill and countersink holes into the frame, to attach to the wall
- Drive screws through the window frame into the surrounding structure.
- Space fasteners evenly to ensure stability. Below marked in red are the ideal fixing points for a round window installation
- Check Alignment
- Ensure the window is level and opens/closes properly.
5. Insulate and Seal the Window
- Apply Expanding Foam Insulation
- Fill any gaps between the window frame and the wall with low-expansion foam.
- Avoid overfilling, trim foam once dry
- Seal with Exterior Caulk
- Apply a final bead of caulk around the exterior edges of the window.
- Smooth it out with a caulk tool or a wet finger for a clean finish.
6. Install Trim and Finishing Touches
- Attach Interior and Exterior Trim (if needed)
- Use decorative trim to cover the edges of the window for a polished look. We can also make an architrave for your window, please ask.
- Secure it with nails or screws.
Final Checks and Maintenance Tips
- Inspect for Leaks – After installation, check both inside and outside for any air or water leaks.
- Clean the Glass – Use a soft cloth and glass cleaner for a streak-free finish.
- If you installed the glass after installing the window, make sure to add a bead of silicone to all glass-wood joints.
- Regular Maintenance – To extend the life of your wooden window, clean, reapply sealant (if you notice signs of varnish or paint damage) and check for signs of wear. This should be done on an biannual basis with pine windows, and each 5-7 years with hardwood windows. See our blog post on wooden window maintenance
Conclusion
A successful round window installation requires careful measurement, precise cutting, and proper sealing. When installed correctly, a round wooden window can enhance your home’s appearance while providing long-lasting durability. By following these steps, you’ll achieve a professional-quality installation that improves both aesthetics and energy efficiency.
Would you like more details on specific window designs or custom sizing? Send us an email today!
Leave a Reply