Skip to main content
£0.00 0

Basket

No products in the basket.

← Rooflight journal

Replacing a Roof Dome with a Flat Glass Skylight

Check the existing kerb, opening, support and weathering before replacing a roof dome with a flat glass skylight.

Stratus flat skylight over a kitchen
Stratus flat skylight installation example above a kitchen.

Identify what is already there

Record the existing product information if available, but do not use the dome's visible size as the ordering dimension for a replacement. Ask the installer to inspect the opening, support and roof covering. Establish whether the existing kerb will be retained, altered or rebuilt before choosing the replacement unit.

Framed Korniche flat skylight on a flat roof
Framed Korniche flat skylight example; this is a separate product from FlatLite.

Use the new product's measurement reference

Different rooflights can use different ordering dimensions. The existing unit's label may not describe the reference required by the new designer. Read the selected Stratus or Korniche flat skylight specification and current drawings with your installer. Confirm the finished dimensions, orientation and required fall for that particular system rather than transferring assumptions from the old dome.

Stratus flat skylights over a living room
Stratus flat skylight installation example above a living area.

Coordinate weathering and internal finishes

Replacing a rooflight can affect the waterproof membrane, insulation and ceiling junction. Agree who is responsible for each part of the work and how the room will be protected while the opening is exposed. A supply-only rooflight order does not include those site tasks. If the support has deteriorated, resolve that before installing the replacement.

Fixed flat glass skylight product illustration
General fixed flat-glass rooflight illustration. Use the selected product's drawings for exact details.

Plan lifting, delivery and the final check

Glass units need a handling plan suited to their actual size and weight. Check site access and the route to the roof before arranging delivery. Once the product and support details are approved, enter the confirmed dimensions in the appropriate designer and review the selected glazing. Keep the final order summary and installation documents together for the fitting team.

Compare specifications and configure your rooflight

Have your installer confirm the selected product's ordering dimensions and support details before placing an order. Read the measuring guide and keep the final specification with your project drawings.