Ideas Library · Ceilings
Splaying a Rooflight Reveal Into the Ceiling
One detail rather than a daylight strategy: the geometry of the reveal around a rooflight, and what choosing an angled splay over a square shaft does to where the light lands and how large the opening feels from the room.
Spaces:Kitchen extensionLoft roomBathroomStair hallLanding
Style:ContemporaryArchitecturalMinimalistModern
Where this idea works
Where this idea works
Contexts this direction tends to suit — and, honestly, where it may not.
- Rooflights in a deep roof build-up where a square shaft would read as a tunnel
- Rooms where light is wanted washing a particular wall rather than pooling on the floor
- Projects where the reveal is still to be formed and the angle can be chosen
- Single-storey extensions and loft rooms carrying roof glazing
Where it may not fit
Where it may not fit
- Rooflights in a thin roof where there is barely a reveal to shape
- Openings where the reveal geometry is constrained by structure around them
- Rooms where extra light on one wall would fall on something better left unlit
Planning
Planning considerations
- A square reveal drops light where the opening is; a splay spreads it onto whichever surface the splay opens toward
- Splaying one side only is a deliberate aiming of the light rather than a compromise
- The reveal is part of the roof build-up, so insulation and the control layers continue through it, which is a professional determination
- An angled reveal makes the opening look larger from the room than the same hole cut square
Layout
Layout considerations
- Decide which wall or surface should receive the light before choosing which sides to splay
- A splay opening toward the room's darkest corner does more than a symmetrical one
- The reveal edges are long straight lines seen against bright glass, so their line is unforgiving
- Consider where the light lands at different times of day before fixing the angle
Materials & finishes
Materials and finishes to discuss
Named generically as starting points to discuss with professionals — not specifications, and not priced.
Consider:Plasterboard on framingStructural softwoodRafter-level insulationPlaster beads and edge profilesRooflight unitsPaint finish
- The reveal sits between the room and the roof, and its build-up governs how it behaves in cold weather
- Edges seen against bright glass reveal any deviation in the plasterwork
Maintenance & durability
Maintenance and durability questions
- Reveal surfaces near glass show marking and condensation staining sooner than the rest of the ceiling
- A high reveal needs equipment to reach for cleaning and decoration
Professional review
What to ask a qualified professional
Bring these questions to a designer, contractor or the relevant qualified professional or authority.
- How deep is the roof build-up here, and what reveal does that leave to work with?
- Which surface in this room should the splay aim light at?
- How do the insulation and control layers continue through an angled reveal?
- Can a professional confirm the structure around the opening allows the angle considered?
- How will the reveal and the glass above it be reached for cleaning?
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