Bringing more natural light into your home with a skylight or sun tunnel is an appealing upgrade, but many Oregon homeowners worry about the potential for leaks. With our region’s frequent rain, proper installation and attention to detail are key to enjoying these features without the risk of water intrusion.
Choosing Between a Skylight and a Sun Tunnel
Before starting your project, it’s important to decide which option best fits your goals and your home’s structure:
- Skylights deliver vibrant daylight and even provide ventilation in some models. They work well in rooms with direct roof access, such as vaulted ceilings, attics, or upstairs bathrooms.
- Sun tunnels (also called tubular skylights) are ideal for bringing daylight into smaller or interior spaces that lack direct roof access. They use highly reflective tubing to transmit sunlight to areas like hallways, closets, or laundry rooms.
When planning your install, consider your roof’s pitch, attic space, and desired light levels. For homes with shallow roof pitches or complex rooflines, sun tunnels may be less intrusive and easier to seal effectively against leaks.
Preventing Leaks: Preparation and Materials Matter
Oregon’s rainy climate makes water infiltration a real concern. Preventing leaks starts with careful product selection and proper preparation:
- Choose quality products: Look for skylights and sun tunnels designed for high-rainfall regions. Most major brands have flashing kits and double- or triple-pane options for added weather protection.
- Roof condition: Never install a skylight or sun tunnel on a roof in poor shape. Shingles should be in good condition and underlayment intact. If your roof needs replacement within five years, schedule it before your install.
- Install on a dry day: Even expert installation can be undermined by moisture trapped during construction. Watch the forecast and avoid rainy or damp conditions.
The Importance of Proper Flashing
Flashing is the critical barrier that keeps water from seeping in around your new skylight or sun tunnel. In Oregon, always use a step-flashing system integrated with your existing roofing material. Preformed flashing kits, usually supplied by the skylight manufacturer, are strongly recommended and much more reliable than site-fabricated solutions.
- For asphalt shingle roofs, flashing should extend beneath the surrounding shingles and overlap in a shingle-like fashion to direct water away from the opening.
- On metal or tile roofs, special flashing adapters may be required; consult the manufacturer’s instructions.
Installation Mistakes That Lead to Leaks
Whether you’re a DIYer or a contractor, avoiding these common errors can prevent the vast majority of leaks:
- Improper or missing underlayment: Always install self-adhering waterproof membrane (“ice and water shield”) around the opening, wrapping up the sides of the curb or tunnel flange.
- Incorrect flashing sequence: The flashing must be installed in the correct order (bottom, sides, then top) and woven with the roofing material. Rushing or skipping steps makes leaks likely.
- Poor curb construction: For curb-mounted skylights, ensure the curb is square, level, and at least 4 inches above the roof surface for Oregon’s rainfall levels.
- Over-reliance on sealants: Caulk and roofing tar are not substitutes for proper flashing. Sealants fail over time and should only be used as a secondary barrier.
- Inadequate attic insulation: Condensation can mimic leaks. Be sure the attic or ceiling space around the installation is properly air-sealed and insulated to prevent interior moisture from entering.
DIY or Hire a Professional?
Skylight and sun tunnel installation is within the reach of experienced DIYers, but requires confidence working on roofs, using a circular saw, and working with flashing systems. Consider hiring a professional if:
- You have a steep or high roof.
- Your roof has multiple layers or unusual materials (such as tile or metal).
- You’re unsure about flashing or waterproofing techniques.
- You want a warranty on the installation.
Small contractors and specialty contractors can add skylight and sun tunnel installation to their services by investing in manufacturer training and practicing installs on mockups before working on customer homes.
What to Watch for After Installation
Even the best installations should be checked after the first heavy rain. Signs of trouble include:
- Water stains or dampness on the ceiling near the installation.
- Condensation buildup inside the tunnel or skylight frame.
- Loose or lifting shingles around the curb or tunnel flashing.
Inspect the installation yearly, especially after major storms, to ensure flashing is intact and no debris is collecting around the opening. Clean skylight glass or sun tunnel domes as needed to maintain light transmission.
Oregon Climate Considerations
Our region’s extended wet seasons and periodic wind-driven rain increase the risk of leaks if proper installation steps are skipped. Always use wide flashing and curb heights appropriate for the local rainfall. If your home is in a region with occasional snow or ice, extra attention to waterproofing and insulation around the skylight or sun tunnel is wise—ice dams can force water under poorly installed flashing.
Wrap-Up and Next Steps
Enjoying leak-free daylight from a skylight or sun tunnel in Oregon starts with careful planning, quality materials, and meticulous installation. Here’s a quick checklist before you begin:
- Select a skylight or sun tunnel designed for heavy rainfall.
- Inspect your roof’s condition and schedule any needed repairs first.
- Follow the manufacturer’s installation instructions, using all supplied flashing components.
- Check your installation after the first big rain, and inspect yearly for peace of mind.
With the right approach, you’ll enjoy natural light and a dry interior for years to come.