Home > Companies > Xtralite (Rooflights) Ltd > Low profile barrel vault

A self-supporting, low profile barrel vault, glazed with solid or multi-wall polycarbonate, which forms an elegant low-rise arc spanning between supporting structures.

The normal geometry of the vault is for the radius to be equal to the span, although other geometries are possible. The ends can be terminated with vertical glazed screens, or can simply abut an adjoining structure.

The system has 'cascade' internal water management system.


  • Maximum wind loading to BS 6399:1: 1.5 kPa.
  • Maximum imposed loading to BS 6399:3: 0.75 kPa.
  • Safety: ACR[M]001:2005 Class B option available.
  • Thermal performance: U-values below 2.0 W/m²K available.
  • Fire rating to BS 476:7: Class '0' Tp(a).

Related literature

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Maximum self-supporting span 10.0 m, no limit to length. Larger spans can be achieved with a sub-structure.

Frame – Finish:

Frames are available in mill finish, anodized, polyester powder coated or PVF2 coated: consult Xtralite for colour range and samples.

NBS Specification

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This product is associated with the following NBS Create clause:
45-25-99/410 Framed rooflights

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Xtralite (Rooflights) Ltd


+44 (0)1670 354157

Product reference

Low profile barrel vault


[___ x ___ mm]
[As drawing ___]


[ ______ ]
 - Finish:
[Anodized – colour ___]
[Mill finish]
[Polyester powder coated – colour ___]
[PVF2 coated – colour ___]


[ ______ ]
 - Type:
[Solid polycarbonate]
[Multi-wall structured polycarbonate]
 - Colour:

Other requirements

[ ______ ]

Manufacturer details

Spencer Road,
Blyth Riverside Business Park,
Northumberland, NE24 5TG
Tel +44 (0)1670 354157
Fax +44 (0)1670 364875
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