What Skylight Installation Involves
A skylight installation brings natural light into your home through a weather-tight opening cut in your roof.
This requires precision work to prevent water damage that spreads inside framing and insulation.
Installation requires cutting through your roof deck and sheathing, installing step flashing and counter-flashing to shed water, wrapping underlayment around the opening as backup protection, securing the skylight unit with fasteners, and hand-applying waterproof sealant to every joint before reinstalling roof shingles.
Our installation process includes:
- Inspect roof deck and structural framing to confirm the opening won't compromise the roofline or rafter system.
- Install step flashing where the skylight meets the roof, creating a bridge that sheds water into shingle courses below.
- Overlap counter-flashing to catch any water that penetrates the primary seal and direct it further downward.
- Wrap synthetic underlayment and ice-and-water shield around the opening perimeter as waterproof backup protection layers.
- Fasten the skylight frame with ring-shank nails or stainless fasteners rated for roof pitch and wind exposure.
- Hand-apply waterproof sealant to every joint, fastener head, and transition before reinstalling shingles around the flashing.
- Match existing shingle color and material type (asphalt shingle, architectural shingle, or other roofing material) during reinstall.
Materials and Waterproofing Systems
Fixed skylights and vented skylights both demand the same flashing precision and waterproof protection.
Premium manufacturers like VELUX and Solatube design units for desert climates, but a skylight is only as strong as its flashing and sealant system.
A complete flashing package includes step flashing (aluminum or galvanized steel), counter-flashing, synthetic underlayment (more durable than roofing felt in extreme heat), waterproof sealant bonded to both frame and roof substrate, ice-and-water shield for freeze protection, corrosion-resistant fasteners, and UV-rated caulk and adhesive.
These materials are essential because Phoenix averages 3,872 hours of sunshine annually. That relentless UV exposure accelerates sealant degradation and metal oxidation.
We specify materials rated for 10+ years under sustained desert UV exposure.
Pre-Installation Roof Inspection
Before cutting any opening, we perform a detailed roof inspection to identify problems that could complicate the work or affect the final cost.
We check for rot or decay in roof deck and sheathing, rafter and joist condition, existing attic insulation and ventilation layout, current shingle type and condition, ridge cap and valley positioning, and Maricopa County building code requirements for flashing standards.
If we discover roof deck damage or compromised framing during the inspection, we tell you immediately and quote repairs separately.
This transparency prevents surprises when we cut the opening.
Phoenix Heat, UV, and Local Conditions
Sustained desert heat accelerates asphalt oxidation and weakens elastomeric sealants.
Vented skylights help your attic by allowing hot air to escape, reducing the load on soffit vents and attic fans—critical when interior temperatures reach 140°F+ without proper ventilation.
Timeline, Cost, and Next Steps
A typical skylight installation takes 1–2 days.
Cost depends on skylight size and type, roof pitch, whether repairs emerge during inspection, and material color matching for shingles.
Vented skylights with solar-powered blinds cost more than basic fixed skylights but offer better temperature control.
We provide a detailed line-item estimate breaking down materials, labor, and timeline before starting work.
Contact us for a free roof inspection and skylight estimate tailored to your home. Call 602-533-0488 today to get started.