How Skylight Installation Works, Step by Step
A skylight installation starts with a design consultation before anyone climbs a ladder. We study your roofline, your ceiling cavity, and how the sun tracks across the house so the light lands where you want it.
- We run a full roof inspection and hand you a written roof estimate, so framing, flashing, and finish work all show up as line items.
- In the attic, we mark the opening between two rafters or trusses and keep the sheathing span intact.
- We cut the decking, lift the surrounding shingle or tile, and drop the debris into a dumpster instead of your flower beds.
- We build a curb from plywood or OSB and anchor it to framing with ring-shank nails and structural screws.
- Ice-and-water shield goes along the curb, then synthetic underlayment spreads across the surrounding substrate.
- Step flashing and counter-flashing lock into the courses, and apron flashing seals the uphill side where water pools first.
- We refit the field course, cut a fresh drip edge at the eave, and hand-seal fasteners with mastic or roof cement.
- We check insulation contact, ventilation, and sealant cure before we pack up the scaffold and ladder.
Materials We Choose and Why
Skylight performance comes down to the unit and the flashing kit around it. We match both to the roof you already own, because a mismatched curb is where most leaks begin.
- Fixed skylights seal tightest and suit bedrooms and hallways, while vented skylights let steam out of a kitchen or bath.
- VELUX units arrive with factory flashing, and a Solatube sun tunnel lights a narrow hall where a full skylight will not fit.
- Solar-powered blinds cut summer heat gain without running wire through the attic.
- Roofing felt and tar paper were the old standard, though synthetic underlayment tears less and stays waterproof far longer.
- Asphalt shingle is America's largest-selling roofing material, so we keep architectural shingle and three-tab shingle profiles on hand for a close color match.
- Wood shake and cedar shake get hand-nailed, since a nail gun splits dry shakes and opens a path for water.
- Slate, clay tile, and concrete tile are heavy enough that the framing sometimes needs reinforcement before installation.
- On low-slope sections, TPO, EPDM, PVC membrane, built-up roof, and modified bitumen each take a different flashing detail, and hot tar work waits for a dry deck.
- Metal panel, standing-seam panel, and corrugated panel need gasketed fasteners, because exposed screw heads back out first.
What We Inspect, and What Roof Damage Looks Like
Skylight leaks rarely start at the glass. Water wicks along the flashing, erodes the sealant bead, and rots the roof deck months before a stain reaches your ceiling.
- Ceiling stains and bubbling paint usually trace back to failed sealant, a dry caulk line, or a lifted drip edge.
- Soft sheathing underfoot means rot or decay has reached the plywood, and a patch will not hold a screw.
- Granule loss and curling shingles signal end-of-life wear, so replacing the roof beats patching around the unit.
- A sag in the roofline can mean a wet rafter, joist, or ridge beam has started to settle.
- Cracked lenses and chalky, flaking sealant are the clearest signs a unit is past its service life.
- Chimney flashing, pipe flashing, a worn pipe boot, or a torn vent boot mimic skylight leaks more often than you would guess.
- Ice dam buildup at the eave pushes meltwater sideways, under the flashing, and into the attic insulation.
Roofscape Details That Change the Work
Where a unit sits on the rooftop changes the flashing plan. A curb near a valley, dormer, or chimney takes more work than one sitting in a clean field of shingles.
- Ridges, hips, gables, and the rake all meet the curb somewhere, so we reset the ridge cap and add a ridge vent when the attic needs more exhaust.
- Dormers, parapets, scuppers, coping, and mansard or gambrel profiles each send water a different direction, so each gets its own apron flashing and boot flashing detail.
- Gutters, downspouts, soffit, and fascia carry what the skylight sheds, while an overhang, canopy, or awning above a doorway adds one more surface to weatherproof.
- Snow guards stop sheets of ice from sliding off the glass onto a walkway, and a rated anchor keeps our crew tied off with a safety harness while they work.
- Purlins, battens, and counterbatten runs go in before tile or standing-seam panel, so fasteners land on framing instead of thin substrate.
Local Conditions, Timelines, and Costs
Sonoma County gives a roof everything at once. Hot, dry summers bake sealant and raise wildfire risk, coastal fog keeps the roof deck damp until mid-morning, and Pacific storms drop most of the year's rain in a handful of weeks.
Steam ice and heavy dew slow us down, so we begin tear-off work after the surface dries. Building code governs ice-and-water shield placement, fastener patterns, and ventilation, and many older homes here have neither a vapor barrier nor a soffit vent.
Skylight installation takes one day in dry weather. New installs that need framing, gutter services, or a full roof replacement run two to three days, and we schedule around rain rather than through it.
Roof pitch, shingle type, attic access, and how much decking comes out are the main cost drivers, and we put a range on paper before we start.
If storm damage or hail took out the surrounding roof, we photograph the failed flashing for insurance claims and hand you a file your adjuster can use.
We are a licensed and insured roofing contractor serving Santa Rosa and the wider North Bay, handling residential roofing and commercial roofing for local businesses and contractors. Call 415-687-5270 for a free estimate and a straight answer on whether repair or replacement makes more sense.
Customer testimonials we pass along come from neighbors who watched the work happen, and customer satisfaction on a skylight really comes down to one thing: whether the ceiling stays dry through the next storm.
When people go looking for roofers near them, what they usually want is a crew that answers the phone, shows up when they say they will, and sweeps the driveway before leaving.
Longer-lasting materials and better attic airflow show up on an energy bill within a season, and keeping a roof out of the landfill is where sustainability in roofing actually starts.
