The SFG is supplied as a frame and glass unit only.

It is not supplied with flashings, making it suitable for installation onto existing flashings or where the installer is fabricating a custom flashing detail.

SFG is typically selected when:

- Replacing an existing glass skylight while retaining the original flashings
- Installing onto a purpose-built upstand or curb
- A custom flashing detail is required
- The installer prefers to fabricate flashings on site

It offers flexibility without the need to replace the entire roof detailing.

Yes. The SFG is commonly used to replace existing glass or acrylic skylights, provided the existing flashing or upstand is suitable.

In many replacement projects, the SFG is custom sized to match the existing opening, minimising roof disturbance.

SFG sizes are listed as nominal throat sizes.

When replacing an existing skylight, it’s important to measure the clear opening rather than the external flashing dimensions to ensure the correct unit is specified.

In most cases, double glazing is strongly recommended, particularly when the skylight is installed over an internal, conditioned space.

Single-glazed glass skylights comply with AS1288:2021 for overhead glazing and are suitable for some applications. However, single glazing is prone to condensation, especially during cooler months or when there is a temperature difference between the internal and external environment.

Condensation can cause water droplets to form on the underside of the glass and drip below, which is often mistaken for a leak even though the skylight is performing correctly.

Double glazing significantly reduces the risk of condensation, improves thermal performance, and enhances occupant comfort. For this reason, Skyspan generally recommends double glazing for habitable spaces, trafficable glass floors, and any skylight installed above internal areas.