Install a Tubular Skylight in a Single Afternoon
A dark hallway or windowless bath gets real daylight for about $350 and four hours, with no framing, no drywall, and a hole in the roof small enough to flash with a single kit.
A conventional skylight means cutting rafters, building a curb, and finishing a light shaft in drywall. A tubular skylight skips all of it. A 10- or 14-inch acrylic dome on the roof catches light, a mirror-finish aluminum tube carries it through the attic, and a diffuser at the ceiling spreads it into the room. The 10-inch size lights about 150 square feet, the 14-inch roughly 300, which is a bathroom, a hallway, or a closet that never had a window. The work is one hole in the ceiling, one in the roof, and a flashing job you can do with a caulk gun.
Where the tube can actually go
Get into the attic first. You need a spot on the ceiling directly below a rafter bay with no wiring, plumbing vents, or ductwork in the way, and ideally with less than 6 feet of vertical run to the roof. The tube can jog with angle adapters, but every bend costs light. South-facing roof exposure delivers the most light; north-facing still works but is dimmer. Skip valleys, hips, and spots within 2 feet of a chimney or plumbing stack.
Mark the ceiling and cut it
From below, find the center of your chosen spot and drive a nail up through the drywall as a marker. In the attic, confirm the nail landed clear of joists and obstacles, then move insulation aside. Back in the room, use the kit’s template to trace the ceiling ring and cut with a drywall saw, keeping a bucket under the hole. Screw the ceiling ring to the drywall or add a scrap-wood cleat between joists if the template lands near one.
Transfer the center to the roof
Hang a plumb bob from the roof sheathing to the center of the ceiling hole, or shoot a laser straight up, and mark the underside of the sheathing. Drive a long screw up through the roof from inside so you can find it from above. If the mark lands on a rafter, shift up to 3 inches sideways; the tube’s slight angle will not matter.
Cut the roof opening
On the roof, tied off, find your screw and center the flashing template on it. Trace the circle, then cut through the shingles and sheathing with a reciprocating saw, staying just inside the line. Pull the screw. Gently lift the shingles on the upslope side and both sides of the opening with a flat bar, breaking the seal strips so the flashing can slide underneath.
Set and seal the flashing
Bed the underside of the flashing in roofing sealant. Slide it under the upslope and side shingles and over the downslope course, exactly like a plumbing vent boot. Fasten the flange with gasketed stainless screws every 4 inches around the perimeter where it sits under shingles, and seal each screw head. Run a bead along the top edge of the flange under the shingles and press them back down. Never fasten through the exposed downslope portion.
Assemble the tube
Attach the first tube section to the flashing collar from the attic, then add sections downward, overlapping each joint about 2 inches with the reflective side in and screwing each joint with three sheet-metal screws. Wrap every seam and every screw with foil tape; light leaks at the seams show up as dim spots and dust finds its way in. Use angle adapters top and bottom if the run is offset, and cut the last section with tin snips to land 1 inch above the ceiling ring.
Finish the dome and diffuser
Set the dome on the flashing collar, snap or screw its retaining ring, and check the weep holes point downslope. Inside, snap the diffuser into the ceiling ring, and tuck insulation back around the tube without compressing it. Then turn off the lights and see the difference.
Roof work above a single story on a low-slope roof is one thing; anything steeper than 6-in-12 or above one story deserves a harness anchored to the framing and a helper on the ground. Do not attempt this on a wet roof or a hot afternoon when the shingles are soft enough to scar. In snow country, ask for the kit’s high-profile dome and mount it so drifts cannot bury it.
One small hole in the roof, flashed like a vent pipe, and a dark hallway gets its window.
Keeping the light bright
Wipe the dome once a year when you clean gutters and check that the sealant beads are still bonded. A tube installed in an unconditioned attic can sweat in winter; the fix is the manufacturer’s insulation sleeve or a wrap of duct insulation. Expect the acrylic dome to last 20 years and the tube indefinitely. If the room still needs light at night, the kit’s optional LED module drops right into the diffuser ring, and that is a ten-minute add-on for a later weekend.
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