Skylights are a popular architectural feature that enhances natural lighting and the overall aesthetic of a home. However, improper installation or use of incomplete flashings around skylights can lead to a host of problems, including water leaks, structural damage, and reduced energy efficiency. Proper flashing is critical for ensuring the long-term functionality and durability of your skylight and surrounding roof.

Flashings are thin pieces of metal or other waterproof materials installed around skylights to create a watertight barrier between the skylight and the roof. They are designed to direct water away from vulnerable joints and seams, preventing leaks and protecting the underlying roofing materials.

When flashings are installed incorrectly or are incomplete, they fail to provide this critical protection, leaving the skylight and roof susceptible to water infiltration and damage.

1. Water Leaks

Poorly installed or incomplete flashings are the leading cause of skylight leaks. Water can seep through gaps in the flashing during rain or snow, leading to stains, water damage, and mold growth inside the home.

2. Roof Damage

When water bypasses faulty flashings, it can cause damage to the roof deck, underlayment, and even structural components of the roof. Over time, this can lead to rot and compromised roof integrity.

3. Energy Inefficiency

Improper flashing installation can leave gaps where air can escape or infiltrate. This can result in higher energy bills as your HVAC system works harder to maintain indoor temperatures.

4. Premature Skylight Wear

Water intrusion and constant exposure to moisture can damage the skylight frame and glazing, reducing its lifespan.

• Water Stains or Dripping: Evidence of water inside the home around the skylight.

• Visible Gaps or Loose Flashing: Flashings that are visibly misaligned or missing.

• Peeling Paint or Bubbling Plaster: Indicators of prolonged exposure to moisture near the skylight.

• Mold or Mildew Growth: A sign of trapped moisture around the skylight area.

• Warping or Cracking: Damage to the skylight frame or surrounding roofing materials caused by persistent water intrusion.

1. Improper Installation

Incorrect installation techniques, such as failing to overlap flashing components or using inadequate fasteners, can leave gaps where water can penetrate.

2. Incomplete Flashing Kits

Using a flashing kit that does not match the type or slope of the roof can result in insufficient coverage and exposure to leaks.

3. Wear and Tear

Flashings can deteriorate over time due to exposure to weather elements, causing cracks, corrosion, or dislodgement.

4. Incompatible Materials

Using flashing materials that are not suited for the skylight or roofing material can lead to improper sealing and performance issues.

5. DIY Installation Errors

While DIY skylight installation may seem cost-effective, lack of experience often results in poorly installed flashings, increasing the risk of leaks.

1. Hire a Professional Installer

Ensure your skylight is installed by an experienced professional who follows manufacturer guidelines and uses high-quality materials. A proper installation will include securely attached and overlapping flashings.

2. Use the Correct Flashing Kit

Always use a flashing kit designed for your specific skylight model and roof type. Consider factors such as roof slope, roofing material, and skylight size when selecting the kit.

3. Inspect Regularly

Perform regular roof inspections to check for signs of wear, damage, or dislodged flashings. Address any issues promptly to avoid further complications.

4. Maintain Your Roof

Keep your roof free of debris that can obstruct water flow and stress the flashings. Ensure gutters and downspouts are clean and functional to direct water away from the roof.

5. Seal Gaps Properly

Apply a waterproof sealant to flashing joints and edges for added protection against water infiltration.

If you suspect problems with your skylight flashings, it’s important to address them immediately to prevent further damage:

1. Assess the Damage

Inspect the flashing and surrounding area for gaps, corrosion, or misalignment. Also, check for underlying roof damage caused by leaks.

2. Replace or Reinforce Flashings

If the flashings are incomplete or damaged, they should be replaced. For minor issues, additional flashing material or sealant may suffice.

3. Repair Roof Damage

Address any roof deck or underlayment damage caused by leaks before reinstalling the skylight or flashings.

4. Professional Evaluation

For significant flashing issues, consult a roofing contractor to ensure repairs are performed correctly and meet building code requirements.

Proper flashings are essential for the functionality and longevity of skylights. By understanding the risks associated with wrong or incomplete flashings and taking preventative measures, homeowners can avoid costly repairs and enjoy the beauty and benefits of skylights for years to come. Regular maintenance and professional installation are the keys to keeping your skylights watertight and worry-free.