By Skylight Experts
Why finishing matters
The interior light shaft directs daylight from the roof to the room below. Poorly finished shafts can cast shadows, reduce light and look unfinished. A professionally designed light shaft uses reflective or white surfaces to maximise light distribution and includes insulation to prevent condensation and heat loss.
Design options
· Rectangular shafts are straightforward to construct and suit most rooms.
· Tapered shafts spread light over a wider area, making them ideal for high ceilings.
· Tubular shafts offer compact solutions for hallways and small spaces. Tubular skylights use mirrored pipes and diffusers to deliver daylight without heat gain.
Choosing a finish — whether plasterboard, tongue‑and‑groove timber or painted MDF — depends on your décor. A light‑coloured, matte finish reflects light softly, while glossy surfaces create brighter reflections.
Insulation and moisture control
Insulating the shaft prevents heat transfer and condensation. Vapour barriers and air seals are essential where the shaft passes through an attic. Failing to insulate the shaft is a common source of heat loss and moisture problems.
FAQs
Q: Can I build my own light shaft?
A: DIY shafts are possible for simple rectangular designs, but complex shapes and proper insulation require professional skills.
Q: Does the shaft need to be straight?
A: White or light shades maximise reflectivity and diffuse light evenly.
Q: What paint colour is best for a light shaft?
A: White or light shades maximise reflectivity and diffuse light evenly.
