The CSL uses a thermoformed acrylic dome, whereas glass circular skylights use flat or curved laminated glass.

- The acrylic dome:
- naturally sheds water and debris
- performs well on flat and low-pitch roofs
- provides diffuse, even daylight
- is lighter than glass, simplifying installation

This makes the CSL ideal where simplicity, light diffusion, and low maintenance are priorities.

Yes. The domed acrylic profile is specifically suited to flat and low-pitch roofs, allowing effective water runoff without relying on roof pitch.

This is a key advantage over flat glass skylights, which typically require minimum pitches or engineered hobs.

As standard, the CSL is supplied with a square flashing to suit a square external roof penetration.

Where required, circular external flashings can be manufactured to suit circular roof openings.
Circular flashings are custom items and are supplied at an additional cost, which is allowed for at quotation stage.

Skyspan dome skylights are supplied with acrylic domes as standard, however polycarbonate domes can be specified on request.

Acrylic is the preferred standard material because:
- it has excellent long-term UV stability
- it resists yellowing, clouding, and embrittlement over time
- it maintains clarity and structural integrity for longer periods in Australian conditions
- it offers very good impact resistance for skylight applications

Polycarbonate is:
- initially stronger and more impact resistant than acrylic
- often chosen where short-term impact resistance is the primary concern

However, polycarbonate is more susceptible to UV degradation over time. Prolonged exposure to sunlight can cause it to:
- discolour or haze
- lose strength
- become brittle earlier than acrylic

For this reason, acrylic generally offers a longer service life for roof-mounted skylights exposed to constant UV radiation.

A traditional acrylic dome skylight is best specified where simplicity, roof conditions, and maintenance considerations are the priority.

CSL skylights are often chosen instead of glass when:
- the roof is flat or very low pitch
- the area is leafy or debris-prone
- a lighter-weight skylight is preferred
- budget or program constraints favour a simpler solution
- the skylight is over a non-conditioned space (e.g. corridors, stairwells, utility areas)

Glass skylights are typically specified where thermal performance, refined aesthetics, or high-end architectural outcomes are required.