Tubular Skylights

INTRODUCTION

Flexible Engineering is pleased to provide a full suite of tubular skylight solutions for residential, commercial, and industrial applications. Tubular skylights — also known as sun tunnels or light tubes — are compact daylighting systems that capture sunlight at the roof, channel it through a highly reflective tube, and deliver soft, comfortable natural light into interior spaces with minimal structural modification. These systems are an efficient way to increase daylighting, reduce electric lighting energy use, and improve occupant comfort in spaces that are hard to reach with conventional skylights.

This document presents a comprehensive overview of the tubular skylight product families, accessory options, technical considerations, installation benefits, and application guidance. It is intended to support architects, contractors, facility managers, and end users in selecting the right solution for a wide range of roofs, ceilings, and building types.

WHY TUBULAR SKYLIGHTS?

Tubular skylights combine the advantages of natural daylight with a small roof footprint, quick installation, and minimal heat gain compared to large glass skylights. Their main components — a roof-mounted dome or curb-mounted collector, a highly reflective light tube (rigid or flexible), and a ceiling diffuser — work together to transfer daylight efficiently while reducing UV transmission and glare. For interior spaces such as corridors, bathrooms, stairwells, closets, machine rooms, and warehouse aisles, tubular skylights are often the most practical and cost-effective daylighting option.

PRODUCT FAMILIES — RESIDENTIAL AND ROOF-TYPE SPECIFIC

Flexible Engineering supplies tubular skylight systems configured to suit every common roof type and installation preference:

1. Pitched Roof / Sloped Roof Models

These are low-profile dome-based collectors designed for pitched roofs (typically roofs with slopes 2:12 and steeper). The domes capture sunlight across a broad range of sun angles and use a single-piece flashing that integrates with asphalt shingles and similar roof coverings. Key features often include UV-blocking domes, condensation-release vents in the dome, and watertight flashings. Pitched roof models are ideal for hallways, bathrooms, kitchens, and rooms where the roof plane is sloped. Their low-profile design blends well with rooflines and is engineered to perform from sunup to sundown.

2. Flat Roof / Low-Slope Models

Flat roof or low-slope installations use specially shaped domes or curb-mounted collectors that interface properly with membrane roofs, built-up roofs, and modified bitumen systems. Flat roof models typically include a flashing system that ensures a watertight seal and can be mounted directly to the roofing membrane or to a prefabricated curb. These models are commonly used for attic-less buildings, commercial flats, and garages where a pitched-roof collector is impractical.

3. Curb-Mount Models

Curb-mount tubular skylights are designed to be installed on a pre-built curb. The curb mount option provides a robust and flexible installation for both residential and commercial roofs, and it is especially suitable when the roof has complex detailing or when a precise roof penetration is pre-planned during construction. Flood-resistant curb flashings and square-shaped cladding make curb-mount units adaptable to many roof finishes.

4. Tile Roof Models and Specialty Flashings

For tile roofs, terracotta, or slate, the skylight system includes tile-specific skirts or flashing accessories to preserve watertight integrity and roofing aesthetics. These flashing accessories allow tubular skylights to be installed with minimal disruption to the original roof tiles and help maintain the roof’s finish while preventing leaks and ponding. Tile flashing kits and turret extensions are standard options for tile roof installations.

COMMERCIAL AND INDUSTRIAL TUBULAR SKYLIGHT SYSTEMS

For larger commercial and industrial applications, Flexible Engineering provides commercial-grade tubular skylights featuring larger diameters, rugged components, and high-performance reflective tubes. Commercial systems are designed to illuminate larger floor areas (hundreds of square feet per unit depending on tube diameter) and can be fitted with rigid reflective tubes, superior dome collectors, and heavy-duty diffusers for high-output daylighting. These commercial lines emphasize durability, long-term performance, and may be backed with extended warranty commitments suitable for warehouses, manufacturing halls, and office buildings.

CORE COMPONENTS AND PERFORMANCE CHARACTERISTICS

A typical tubular skylight system includes three main parts — roof collector, light-transmitting tube, and ceiling diffuser. Each element contributes to the system’s performance:

• Roof Collector (Dome or Curb): Designed to capture sunlight efficiently while minimizing water entry and thermal losses. Collectors are available in domed or curb styles optimized for different roof geometries. Dome materials are engineered to block a majority of harmful UV while allowing visible light to pass.
• Reflective Tube (Rigid or Flexible): The tube transfers collected light into the building interior. Rigid tubes made of highly reflective aluminum or multi-layer reflective linings ensure minimal light loss across long runs, while flexible tubes simplify routing around obstacles in attics or soffits. Reflectance values approaching or exceeding 98% are common for premium-lined rigid tubes, maximizing lumen delivery to interior spaces. Rigid reflective tubes are often recommended for longer runs and commercial installations, whereas flexible tubes are useful for shorter runs and retrofit scenarios.
• Ceiling Diffuser: The interior diffuser disperses incoming light evenly into the room. Options include prismatic, soft white, or semi-diffuse domes that reduce glare and distribute light uniformly. Diffuser choice impacts the perceived brightness and the distribution pattern; prismatic diffusers are commonly chosen for a balance of brightness and anti-glare performance.

ACCESSORIES AND OPTIONAL UPGRADES

Flexible Engineering offers a comprehensive accessories range to tailor tubular skylights to the exact needs of the project:

• Diffusers: Various diffuser finishes (prismatic, dome, soft-white, flat) to suit aesthetic and glare control requirements.
• Dimmer Kits: Mechanical or optical dimmer kits allow occupants to reduce daylight output for media rooms or to reduce glare during peak sun conditions. These are simple, low-maintenance solutions for adjusting natural light levels.
• Electric and Solar-Powered Night-Light Kits: For 24-hour functionality, integrated night-light kits (electric or solar) provide supplemental LED lighting after sunset, ensuring continuous illumination when daylight is unavailable. These kits are especially useful for hallways or stairwells that require low-level night lighting.
• Tube Extensions and Reflective Upgrades: Extension sections and premium reflective linings ensure sufficient lumen delivery for high-ceiling or long-run applications.
• Flashing and Tile Roof Skirts: Specialized flashing kits and tile skirts maintain weather-tight installations on tile and slate roofs.
• Venting / Exhaust Kits: Certain accessory kits include vent kits suitable for kitchens or bathrooms to combine daylighting with passive exhaust functionality.

INSTALLATION, COMPATIBILITY, AND BEST PRACTICES

One of the key advantages of tubular skylights is their minimal invasiveness — many installations can be completed rapidly without major structural changes. Best practices include:

• Pre-Installation Survey: Identify routing from the roof collector to the desired ceiling location, noting attic obstructions, insulation, and potential condensation-prone areas.
• Choose the Right Tube Type: Use rigid tube runs for long, high-output commercial installations and flexible tubes for short retrofits or where routing flexibility is required.
• Flashing Compatibility: Select flashings and tile skirts matched to your roof material (asphalt, metal, tile, membrane) to maintain waterproofing integrity.
• Thermal and Moisture Considerations: Use condensation-release domes or ventilated diffusers in humid environments (bathrooms, kitchens) and ensure attic insulation and sealing minimize thermal bridging.
• Professional vs. DIY: While many residential units are designed for quick installs (some manufacturers advertise ~2 hours for a simple install), commercial and complex residential projects benefit from certified installers to ensure compliance with local building codes and longevity.

ENERGY, SUSTAINABILITY, AND OCCUPANT COMFORT BENEFITS

Integrating tubular skylights reduces reliance on electric lighting and lowers operational energy use, particularly during daylight hours. Natural daylight contributes positively to occupant wellbeing, improving mood, perceived space, and visual acuity for tasks. In commercial settings, adequate daylighting has been linked to improved productivity and lower absenteeism. The low-profile, well-insulated design of modern tubular skylights minimizes unwanted heat gain and UV exposure, preserving interior finishes while delivering comfortable daylight.

SPECIFICATION GUIDANCE AND SELECTION CHECKLIST

To specify the correct system, consider the following checklist:

• Room size and desired lux levels: Choose larger diameters or multiple units for larger spaces or areas requiring higher illuminance.
• Roof type and pitch: Select pitched, flat, curb, or tile-specific models to match the roof conditions.
• Run length from roof to ceiling: Use rigid reflective tube for longer runs (commercial) and flexible for short or curved runs.
• Diffuser type: Pick a diffuser finish for the right balance of brightness and anti-glare performance.
• Accessories needed: Decide on dimmers, night-lights, vent kits, or additional tube sections at the design stage.
• Warranty and service: Confirm product warranty, replacement parts availability, and local support for maintenance.

MAINTENANCE AND LIFECYCLE CONSIDERATIONS

Tubular skylights are typically low maintenance. Routine checks should include inspecting roof flashings for damage after extreme weather, cleaning the interior diffuser if dust accumulates, and ensuring any venting accessories remain operational. High-quality reflective tubes and domes have long service lives; in commercial contexts, check warranty terms and reflective lining guarantees for the chosen model.

CONCLUSION

Flexible Engineering’s tubular skylight solutions provide adaptable, energy-efficient daylighting for residential, commercial, and industrial applications. With product families tailored to pitched roofs, flat roofs, curb mounts, and tile roofs — plus a broad set of accessories and commercial-grade options — these systems enable designers and building owners to bring soft, natural light into spaces where it was previously impractical. Whether the project requires a fast residential retrofit or a high-output commercial daylighting installation, Flexible Engineering can support specification, supply, and installation to deliver long-term daylighting performance and occupant comfort.