VELUX

VELUX doesn’t pretend to make budget skylights. They’re laser-focused on bringing natural light into homes through roof windows, skylights, and sun tunnels — and they’ve been perfecting it since their first patented roof window in 1948. Their whole lineup targets contractors who need precise performance specs and homeowners who want reliable daylight solutions.

Sun Tunnels: Rigid vs. Flexible Performance

The TMR 014 rigid sun tunnel covers up to 325 square feet with 99.99% reflectivity. That’s not marketing fluff — it’s silver-coated aluminum doing what physics demands. Rigid tunnels extend up to 30 feet with ZTR extension tubes, making them the right choice for straight runs from roof to ceiling.

Sun Tunnel Specifications	Rigid TMR 014	Flexible TGF 014
Coverage Area	Up to 325 sq ft	Up to 150 sq ft
Reflectivity	99.99%	High reflective surface
Maximum Length	30 feet (with extensions)	8 feet
U-Factor	0.50 (0.38 with energy kit)	0.45 (0.35 with energy kit)
SHGC	0.51 (0.28 with energy kit)	0.27 (0.22 with energy kit)

Flexible tunnels work where rigid won’t — around pipes, ducts, and beams in the attic. Eight feet maximum length, but they’ll bend to get the job done. The trade-off? Less light transmission than rigid. Pick flexible when obstacles make rigid impossible.

The Flexi-Loc connection system cuts installation time by eliminating screws — tubes snap together. Pivot rings let the dome align vertically on pitched roofs for maximum light capture. Both features matter when you’re in a hot attic trying to finish before lunch.

Flashing That Actually Works

EDL flashing handles roof pitches from 14° to 85°. Step flashing design interweaves with shingles — no caulk, no sealants, no callbacks. The 10-year no-leak warranty applies when installed with adhesive underlayment.

EDL106 Flashing Specifications	Value
Roof Pitch Range	14° to 85°
Compatible Roof Types	Asphalt shingles, wood shakes, slate, materials up to 1/2” thick
Rough Opening	21” × 45-3/4”
Outside Frame	21-1/2” × 46-1/4”
Material	High-quality neutral gray aluminum (copper special order)

Pitched flashing optimizes light capture on sloped roofs. Low-profile options integrate seamlessly with the roofline. Both work on shingle, wood shake, slate, or metal roofs with the right pitch.

Fixed Skylight Energy Numbers

The FSC06 fixed skylight delivers U-factor 0.44 with Low-E3 coating. Not the lowest on the market, but respectable for Montana’s Climate Zone 6. The laminated Low-E3 glass blocks 99.9% of UV rays while reducing outside noise by 25%.

Energy efficiency matters more than aesthetics when winter heating bills arrive. U-factors range from 0.43 to 0.53 across the line, with SHGC around 0.23 to 0.27. Those numbers determine whether south-facing installations help or hurt your heating load.

Who Actually Needs VELUX

VELUX targets professional contractors and residential customers for both new construction and existing buildings. Their sun tunnels solve real problems — bringing light to interior bathrooms, hallways, and closets where traditional windows won’t work.

Rigid sun tunnels install in an afternoon at lower cost than traditional skylights, providing brighter, more natural light with minimal disruption. That efficiency matters when labor costs more than materials.

Skip VELUX if you’re shopping purely on price. They’ve built their reputation on the 99.99% reflectivity spec, 20-year warranties, and impact-resistant options for hurricane zones. For contractors who value performance data over marketing promises, VELUX delivers measurable light transmission and energy ratings that help close sales.

FAQs

What’s the real difference between rigid and flexible sun tunnels?

Rigid tunnels deliver more light through straight runs up to 30 feet, while flexible tunnels bend around obstacles but max out at 8 feet. Rigid achieves 99.99% reflectivity versus “high reflective surface” for flexible — that percentage difference shows up as noticeably brighter light. Choose rigid whenever possible. Use flexible only when attic obstructions force the issue.

Do VELUX flashing kits really prevent leaks without sealants?

The step flashing design interweaves with roofing materials, creating mechanical water shedding without relying on caulk or adhesives. VELUX backs this with a 10-year no-leak warranty when installed with their adhesive underlayment. The system works because it follows water’s natural path down the roof rather than trying to block it with sealants that eventually fail.

How much roof area can one sun tunnel actually light?

The TMR 014 rigid tunnel covers up to 325 square feet, while the TGF 014 flexible tunnel handles up to 150 square feet. These work best in hallways, closets, bathrooms, kitchens, laundry rooms, and stairwells. Don’t expect one tunnel to light an entire great room — the physics of light diffusion has limits.

What makes VELUX skylights different from basic models?

VELUX uses laminated Low-E3 glass that blocks 99.9% UV rays and reduces outside noise by 25%. Their venting models include rain sensors for automatic closure and can be solar-powered to eliminate wiring. Features like remote-controlled, solar-powered shades enhance thermal performance and indoor comfort. You’re paying for engineering that prevents callbacks, not just a hole in the roof with glass.