Skylights and sun tunnels can brighten up even the darkest corners of an Oregon home, making spaces feel larger and more inviting. However, a poorly performed installation may lead to leaks—a risk that’s especially important to manage in our rainy climate. Whether you’re a homeowner planning a DIY project, a small contractor, or a specialty installer, understanding what it takes to achieve a leak-free result is crucial.
Choosing Between Skylights and Sun Tunnels
Before starting, decide which daylighting option fits your space and needs. Skylights work well for rooms with direct roof access, like kitchens or living areas. They provide broad illumination and can often be vented for airflow. Sun tunnels (or tubular skylights) are ideal where traditional skylights won’t fit—such as hallways, closets, bathrooms, or rooms beneath attic spaces—by channeling sunlight through a reflective tube.
- Skylights: Best for large, open spaces; often allow for ventilation.
- Sun tunnels: Great for small or interior rooms; minimal structural changes required.
Key Steps for Leak-Free Installation
To prevent leaks, quality installation is just as important as the product you select. Here’s what you need to focus on for both skylights and sun tunnels:
1. Proper Sizing and Placement
- Choose a location with sufficient roof space and minimal obstructions (like vents or trusses).
- Avoid valleys, hips, or flat roof sections where water tends to collect or flow heavily.
- Consider the sun’s path for optimal lighting without excessive heat gain.
2. Waterproof Flashing
Flashing is the barrier that directs water away from your new opening. For Oregon’s wet climate, high-quality flashing kits (usually provided by skylight or sun tunnel manufacturers) are essential. Install the flashing:
- Tightly under the roofing material above the unit.
- Over the roofing material below it, shingling it like the roof itself.
- With extra attention to corners, which are the most common leak points.
3. Underlayment Considerations
Use a self-adhering waterproof membrane (sometimes called ice and water shield) around the opening before installing the skylight or sun tunnel. This secondary barrier is highly recommended for Oregon homes to handle wind-driven rain and ice dams.
4. Sealing and Fastening
- Use the manufacturer’s recommended sealants and fasteners.
- Do not over-tighten screws, as this can warp the frame and compromise the seal.
- Inspect every seam and joint for gaps before moving on to the next step.
Common Mistakes That Cause Leaks
Even experienced installers can make errors. Be aware of these frequent pitfalls:
- Improper flashing: Skipping steps in the flashing installation or using incompatible materials.
- Poor integration with roofing: Not sealing underlayment edges or failing to lap materials correctly.
- Inadequate slope: Installing skylights on roofs with slopes below the minimum recommended by the manufacturer increases leak risk.
- Ignoring roof condition: Installing new skylights or sun tunnels on aging or damaged roofing can lead to leaks around the unit later.
Oregon-Specific Tips
The Pacific Northwest’s persistent rain and occasional snow make weatherproofing especially important. Consider these local factors:
- Opt for flashing kits designed for high rainfall and wind-driven moisture.
- Schedule installations for dry weather when possible, or use temporary covers if sudden rain is forecast.
- For older homes, check for existing ice and water shield under the roofing; add it if missing.
DIY or Hire a Pro?
Skill level and comfort with roofing work should guide your decision. Sun tunnels are relatively straightforward DIY projects for those with basic carpentry skills and roof access. Standard skylights, especially larger or vented models, often require cutting rafters and advanced waterproofing—tasks best left to professionals if you’re unsure.
- DIY is suitable for single-story homes, accessible attics, and uncomplicated roof structures.
- Hire a contractor for complex rooflines, tile roofing, or if electrical connections (for vented skylights or lighting in sun tunnels) are needed.
Inspection and Ongoing Maintenance
Even with perfect installation, regular checks are wise:
- Inspect seals, flashing, and surrounding shingles every fall and spring.
- Remove debris (leaves, moss) that may trap moisture or cause ice dams.
- Look for interior signs of leaks—stains, peeling paint, or musty odors—especially after heavy rain.
Promptly address minor issues before they become costly repairs.
Final Checklist for Leak-Free Installs
- Review the manufacturer’s installation guide and gather all needed materials in advance.
- Choose your skylight or sun tunnel location carefully, avoiding roof valleys or low-slope areas.
- Install high-quality flashing and underlayment, especially in wet-climate regions.
- Double-check all seals and fasteners before closing up the roof.
- Plan for regular inspections after installation, particularly before and after the rainy season.
With good planning and attention to detail, you can enjoy the extra daylight from your skylight or sun tunnel—without worrying about leaks or water damage down the road.