Semi-Circular Barrel Vault Rooflight

The classic vault is a simple semi-circular rooflight that tops the supporting structure; alternatively it can be raised on vertical legs incorporating such features as windows, vents, or louvres. Ends can be terminated with vertical glazed screens or simply abut an adjoining structure.

  • Can be glazed in a range of polycarbonate options - from solid single skin for canopies and unheated spaces, to multi-wall structured giving exceptional thermal performance for Part ‘L’ compliance. Finished in powder white as standard, other options available on request.
  • Metal parts can also be colour coated with polyester powders, PVF2 or anodised.

The spanning performance quoted assumes they are constructed with a classic semi-circular geometry and are self supporting; much larger spans can be achieved although a substructure for additional support would then be required.


Maximum Spans Up to 7.0m (self supporting).
Length Infinite length.
Loading Designed in accordance with CP3 Chapter V Part 2:1972
BS 6399:Part 1 and Part 3 1984 max. 1.5 kPa wind and 0.75 kPa imposed.
Safety ACR[M]001:2005 Class B option available.
Glazing Options Glazing in glass or structured and solid polycarbonate.
Thermal Performance Part L: below 2.0 W/m2K options available.
Fire Regulations BS 476 Part7:class1(1991) Class ‘0’ Tp(a).
Surface Finish Mill finish, polyester powder, PVF2 and anodised.

How to specify Xtralite rooflights

If you would like to specify exactly which configuration you require, click on the following to go to the specification guide:

Go to specification guide

To find a full range of PDF and CAD drawings for the Xtralite range, click on the following to go to the downloads section:

Go to downloads section