Why Do Skylights Leak and How Can You Fix It?

Skylights offer great functionality, but if they are not properly maintained, they can cause problems. Leaks are one of the most common issues homeowners face. In this guide, you will find the main reasons skylights leak—and, more importantly, how to fix them.

Improper Installation: A Hidden Risk

Many people believe that if fresh air skylights are high-quality, they cannot leak. That is not entirely true. Even the best models can let water in if they are installed incorrectly. Problems often arise when flashing kits are skipped, roofing materials are not appropriately applied, or the window frame is not aligned correctly during installation. To avoid this, hire a professional skylight installer in California who understands the local climate and knows how to account for sun exposure and rainfall.

Tip: When checking the finished job, make sure flashing, brackets, and sealant are all snug and even, just as the manufacturer recommends. The waterproofing should fit tightly, and the window should sit level without any tilts.

Solution: When installation issues cause leaks, contact an experienced skylight contractor who can reinstall the unit if necessary.

How Roof Design Affects Leaks

Another possible cause is the shape of the roof itself. This is highly applicable for roofs with a low slope, which are common in many California homes. Water can accumulate at the base of the skylight, eventually creating leaks. Insufficient drainage may also result in localized moisture accumulation.

Solution: Evaluate how your overall drainage system is performing. If the roof slope is too shallow, consider adding extra gutters or improving the drainage layout.

How Sealant Deterioration Reveals Itself

One of the most frequent causes of skylight leaks is the breakdown of sealants, which lose elasticity under the effects of UV rays, dust, and temperature fluctuations. In California’s sunny climate, aging rubber gaskets and silicone seals can become problematic just a few years after installation. Even high-quality skylights can be affected if regular maintenance is neglected.

Tip: Inspect seals annually and clean the surrounding areas. Replacing old sealant in time is a simple way to extend the window’s lifespan.

Solution: Avoid patching the sealant with random products if it is cracked or peeling. Instead, contact an experienced skylight contractor in California, who will select a compatible material and repair the damage with care.

DIY “Improvements” That Do More Harm Than Good

To upgrade their skylights, many homeowners take matters into their own hands, replacing glass units, applying protective films, or sealing ventilation gaps. These “improvements” can break the original waterproofing and lead to leaks. Yet, altering the skylight’s design without fully understanding it can worsen things.

Tip: It is best to leave any modifications to professionals who follow proper standards and avoid structural damage. If the skylight has already been altered and leaks started afterward, restoring the original structure or replacing damaged components may be necessary.

Wind and Rain: Slanting Water Streams Test the Roof’s Limits

California weather can be unpredictable. Coastal and foothill areas often experience strong winds. Wind-driven rain puts additional stress on skylight joints. This becomes especially dangerous when the waterproofing is weak. Water can get under the flashing and seep indoors if the seal is compromised.

Solution: To protect the skylight, reinforced sealing, water barriers, and enhanced insulation along the sides are used. Homes in Orange, Santa Ana, and Irvine are particularly vulnerable, as the weather there can change instantly.

Taking action early is always smart. Annual checkups can help you avoid costly repairs, and if problems do arise, full-service skylight solutions will fix them quickly and efficiently.