Evaluating & Replacing Older Skylights

Roofing Deep Dive

Evaluating & Replacing Older Skylights

A major source of hidden water damage. Discover the hail hazards of original 1990s acrylic domes, flashing failures, and replacement costs from a local residential builder and engineer.

Highlands Ranch Skylight Replacement and Roof Inspection

The Hazard of 1990s Acrylic Domes

Vaulted ceilings and abundant natural light were massive architectural trends in Highlands Ranch during the 1980s and 1990s. To achieve this, builders installed thousands of acrylic "bubble" dome skylights. While they look retro, they represent a significant structural liability today.

After three decades of exposure to Colorado's intense, high-altitude ultraviolet light, these plastic domes become incredibly brittle. During our severe spring hail storms, the compromised acrylic can easily shatter. When a skylight shatters during a thunderstorm, the resulting interior water damage to your drywall, hardwood floors, and electrical systems is catastrophic. Upgrading to modern, impact-resistant flat glass units (like Velux) is a mandatory step for protecting your investment.

The Engineer's Warning: Flashing Failures

If you see water stains on the drywall surrounding a skylight tunnel, do not let a seller tell you they "just need to re-caulk it." Caulk is a temporary band-aid. True leaks are caused by the failure of the metal step-flashing woven into the roof shingles around the unit. The aluminum flashing corrodes or separates over 30 years. The only correct, engineer-approved fix is to completely remove the old skylight, strip the surrounding shingles, install new ice-and-water shield, and integrate a brand new unit with modern, continuous factory flashing.

Seal Failures & Replacement Costs

Another common issue in vintage homes is "foggy" skylights. This condensation indicates that the thermal seal separating the dual panes has completely failed. Once the seal breaks, the insulating properties (R-value) vanish, causing your HVAC system to work overtime to heat or cool the room.

If you are purchasing a home with original skylights, you must budget for their imminent replacement. Depending on the pitch of the roof and the size of the unit, replacing an old dome with a modern, low-E energy-efficient flat glass skylight typically costs between $1,500 and $3,000 per unit. As your real estate advisor, we aggressively identify these failing units during our walkthroughs to negotiate these hard replacement costs into the initial purchase price.

Skylight Replacement FAQ

Why are 1990s acrylic dome skylights dangerous in Colorado?
Original 1990s skylights were typically made of acrylic plastic domes. Over 30 years of intense UV exposure, the plastic becomes incredibly brittle. During Colorado's severe spring hail storms, these brittle domes shatter easily, allowing massive amounts of water to flood directly into the home.
How much does it cost to replace a skylight in Highlands Ranch?
Replacing an old acrylic dome with a modern, energy-efficient flat glass unit (like Velux) typically costs between $1,500 and $3,000 per skylight. This cost includes the new unit, proper step-flashing integration into the roof, and minor interior trim work.
Why does my skylight look foggy or have condensation inside?
A foggy skylight indicates that the thermal seal between the panes of glass or plastic has failed. Moisture has penetrated the void, completely destroying the unit's insulating properties (R-value). The only permanent fix is a complete replacement.
Can a roofer just reseal my leaking skylight?
Caulking a 30-year-old leaking skylight is a temporary band-aid, not a fix. Leaks are almost always caused by the failure of the metal flashing surrounding the unit. The old flashing must be ripped out and replaced alongside a new unit to guarantee a watertight seal.

Continue Your Research