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Isometric view of the required upstand dimensions

Upstand Dimensions
(Intermediate Frameword Omitted)

 

Isometric view on barrel vaulted rooflight with wall and curved upstand interfacing ends

Curved Upstand and Wall Interfaces
(Intermediate Frameword Omitted)

 

Typical sections through a frameless glazing system

(Frameless Glazing)

 

Typical section through a structural glazing system

(Structural Glazing)

 

Typical section through a framed glazing system

(Framed Glazing)

 
Bespoke Barrel Vaulted Rooflight, Skylight and Atrium Designs
 
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Barrel vaulted or curved glass rooflights, skylights and atriums are slightly more costly than flat glass panelled designs. Curved barrel vaulted glass rooflights are however an excellent way of introducing natural light through a roof opening, whilst producing a second line of symmetry along the rooflight/atriums length. Due to the nature of a curved glass prism, the glass thickness utilised will also slightly refract the light into the mid point of the barrel vaulted glass rooflight, skylight or atrium opening. Smaller span barrel vault applications where the glass can span across the opening in just 1 No. glass unit may have no intermediate ridge lines and sometimes no intermediate rafters.

 

Glass gabled ends may be introduced within the barrel vaulted rooflights/atriums design. However shallower pitch applications will require the end upstand detail to be curved to following to barrel vaulted rooflights design.

 

Barrel Vaulted curved glass rooflights, skylights and atriums are often utilised within barrel vaulted and flat roof applications. Budget permitting, curved glass barrel vaulted rooflights/atriums provide many aesthetical benefits. However should budget be a primary consideration on a much larger glass barrel vaulted application, a bespoke flat glass faceting design may also be considered.

 

Isometric view of a barrel vaulted skylight

 

Glass Barrel Vaulted Rooflight on Structural Glass Fins

 

Internal View on Bespoke Frameless Glass Barrel Vaulted Rooflight

 

Internally Frameless, Silicone Glazed Barrel Vault Rooflights

 

Structurally Glazed Barrel Vaulted Single Curved Glass Rooflight

 

Structurally Glazed Barrel Vaulted Glass Skylight

 

Large Faceting Patent Glazed Barrel Vaulted Glass Roof

 
Bespoke Glass BARREL VAULTED Rooflights, Skylights and Atriums - Technical Information

 

DESIGN GUIDE – Barrel Vaulted Rooflights, Skylights and Atriums

The following information has been provided as a general guide on the typically requested products and options within the barrel vaulted curved glass rooflight, skylight and atrium range. It is important to note that due to the nature of our bespoke design and build service. You should contact our offices regarding any bespoke requirements outside of those listed and in order to ensure compatibility with the full specification.

 

Most of the glass rooflight, skylight and atrium options detailed below may also be selected within our standard online budget quote generator (see tab below), which may be accessed by login into an online trade account.

Min / Max Dimensions & Rooflight Pitch

 

Barrel Vaulted glass rooflights, skylights and atriums can be provided at almost any dimensions. Rooflight sizes tend to start at 700mm x 700mm due to supporting upstand dimensions and the level difference typically witnessed between the curved glass rooflight and the ceiling below. Glass curved rooflights, curved skylights and curved atriums up to 4.5m girth are the maximum before additional supporting steelwork/splices will need to be considered. Whilst much larger extents are feasible, the design will need to be developed to incorporate a suitable water management system and facilitate maintenance and cleaning.

 

Barrel vaulted glass skylights, rooflights and atriums can be designed to accommodate any glass radius more than 1,000mm and the radial angle about a single curved glass unit can not exceed 90 degrees (i.e. barrel vaulted designs approaching semi circular in section will need to be provided in two or more glass units). It is worth noting that regardless of rooflight pitch you will normally experience some form of water retention on the glass (e.g. the small water beads that you will find ‘clinging’ to your steep pitch car windows after a downpour). This is due to the gravitational force on the beads (proportional to their mass) being less than the frictional force retaining the water to the glass rooflight. These beads therefore increase exponentially with a reduction in roof light pitch. Although unnoticeable through the steeper pitch applications become more apparent (up to approx. 20 – 30mm dia.) at shallower pitches. You will therefore witness a varying effect on barrel vaulted curved glass rooflights/atriums, where larger retaining beads will be apparent about the centre of the curved rooflight and much smaller towards the eaves. Barrel vaulted curved glass rooflights, skylights and glass atriums may be supplied within a modern day patent glazing system, however this system will not necessarily be suitable for shallower height curved glass barrel vault rooflight, skylight and atriums applications.

Typical Perimeter Interfaces

 

Weathered Upstands

 

Weathered upstand interfaces are most common in barrel vaulted glass rooflight, skylight and atrium designs. The detail consists of the curved glass rooflight framework flashing over a weather upstand, wall or guttering detail and this detail therefore always applies to the leading edges of a barrel vaulted curved glass rooflight (for rain water drainage). Some glass rooflight applications can utilise an upstand as small as 100mm above the roof finishes below. However 150mm upstands are typical of flat roof applications (to BS standards).

 

Wall Abutment Details

 

Barrel vaulted glass rooflight, skylight and atrium designs may also utilise wall abutment details to the ends only. In this instance the glass rooflight frame produces a soaker detail (an upstand) above the rooflight level for flashing over by others (typically in lead). Whilst the detail is commonly utilised on wall abutment details, a similar detail may be utilised to recess a glass rooflight into a perimeter upstand detail (i.e. such detail does not have to abut a wall). 

Systems Available

 

Frameless Glazing

 

Frameless Glazing (or near frameless glazing) may be utilised within bespoke barrel vaulted curved glass rooflight, skylight and atrium designs. Such designs will always consist of a perimeter frame to complete and weather the rooflight; however such frames can easily be concealed by the internal finishes below. Should your curved glass rooflight/skylight application be relatively small, the rooflight may be able to be supplied in just 1 No. glass unit, with no intermediate sight lines. Long, smaller span glass rooflight and atrium applications may also be provided without intermediate supporting sections. Resulting in all glass to glass joints consisting of a flush silicone seal both internally and externally. Larger barrel vaulted glass rooflight/atrium applications can include 48mm(w) structural glass fins to support the glass accordingly. All frameless curved glass rooflight designs will produce a complete flush silicone jointed external finish.

 

Structural Glazing

 

Structural Glazing (or structurally adhered applications) may be utilsed within bespoke barrel vaulted glass rooflight, skylight and atrium designs. Such designs will always consist of a perimeter frame to complete and weather the rooflight; however such frames can easily be concealed by the internal finishes below. Should your curved glass rooflight/skylight application be relatively small, the rooflight may be able to be supplied in just 1 No. glass unit, with no intermediate sight lines. Long, smaller span glass rooflight and atrium applications may also be provided without intermediate supporting sections. Resulting in all glass to glass joints consisting of a flush silicone seal both internally and externally. All larger applications will require intermediate rolled rafter assemblies which may be provided in a large range of extrusion sections. More frequently glass rooflights are supplied with box section rafters. All structural glass rooflight designs will produce a complete flush silicone jointed external finish.

 

Framed (Patent) Glazing

 

Framed Glazing or Patent Glazing may be utilised within bespoke barrel vaulted glass rooflight, skylight and atrium designs. Such curved rooflight designs consist of rolled aluminium box section rafter and transom supporting extrusions. The curved rooflight glass is then retained using EPDM or silicone based gaskets and pressure caps (subsequently concealed by cover/feature caps). Framed glazing systems can heavily rely on a secondary weep water management system, making it imperative that such barrel vaulted rooflight details are installed in accordance with the systems tested details. Patent glazed curved rooflights are more recently provided in modern box section rafters, however many dated glass rooflight structures may utilise Victorian style T section rafters. Our company possesses the ability to undertake such refurbishment contracts, where system extrusions need to be developed to meet current building standards whilst retaining the existing glass barrel vaulted rooflight/atriums character and aesthetics.

System Materials and Finishes

 

Our company specialises in the utilisation of architectural metals and glass. The required barrel vaulted curved rooflight, skylight or atrium glazing system selected may have some bearing on the system finishes available. We are typically requested to provide:-

 

 

Polyester Powder Coated Rooflights, Skylights and Atriums

 

Anodised Aluminium Rooflights, Skylights and Atriums

 

Brushed (Sometimes Polished) Stainless Steel Rooflights, Skylights and Atriums

 

 

Bespoke glass curved rooflight/atrium system finishes may be reviewed in conjunction with the entire design specification.

 

Our company also provides structural steelwork when required as an integrated component to the barrel vaulted glass rooflight, skylights and atrium designs we provide.

Glass Specifications

 

Our company is able to supply most of the glass specifications available within today’s market. Typically requested curved barrel vaulted rooflight, skylight and atrium glass specifications include:-

 

 

Double Glazed and Triple Glazed Specifications

 

Standard Low E Specifications (as standard)

 

High Performance Solar Control Coatings

 

Body Tinted Glass

 

Low Iron Glass (omitting the natural green tint)

 

Sandblasted and Acid Etched Glass

 

Coloured (typically white) Laminates

 

Low Maintenance & ‘Self Cleaning’ Coatings

 

Man Safe and Walk On Rooflight Glass Specifications

 

 

If you have any queries regarding the utilisation of any glass specification within a specific barrel vaulted rooflight application, then please do not hesitate to contact our offices with your enquiry.

Glass Unit Dimensions

 

There are many considerations when reviewing the glass unit dimensions being supplied to a given barrel vaulted glass rooflight, skylight and atrium application. Typically the required glass thickness will increase exponentially with its size, resulting in weight increasing exponentially also. An applications site logistics and the glass handling must also be reviewed and will form part of a barrel vaulted glass rooflight/atrium’s overall cost. Larger glass unit rooflight applications will require suitable plant equipment (typically a crane) to manoeuvre the glass directly into location.

 

Glazing Innovations are capable of providing glass units up to 6,000mm x 3,000mm (although not to this extent in glass barrel vaulted rooflight, skylight and atrium applications). However our offices should be consulted should your application require large glass units as each application will need to be reviewed carefully.

 

Single curved glass barrel vaulted units will have a minimum bending radius of approx. 1,000mm and a maximum rolling angle of 90 degrees.  

Glass & System U-Values

 

Architectural glass curved rooflight, skylight and atrium suppliers will typically provide you with mid pane (or mid unit) U Values. When reviewing a double glazed application with a 16mm (optimum) cavity...

Low E coatings tend to provide a mid pane U Value of 1.7 W/m sq K or 1.6 W/m sq K with an argon filled cavity.

 

High performance solar control coatings tend to provide a mid pane U Value of 1.2 W/m sq K or 1.1W/m sq K with an argon filled cavity.

 

Triple glazed applications may achieve a mid pane U Value of 0.6 W/m sq K.

 

The overall U Value of a barrel vaulted/curved glass rooflight, skylight and atrium application is very much determined by the system details utilised. Well engineered rooflight details that mitigate the extent of the framework retain relatively low U Values. Double glazed curved rooflight, skylight and atrium designs tend to produce an o/all U Value of 1.4 to 2.2 W/m sq K.

Design Loadings

 

Dead loads, wind loadings, snow loadings, maintenance loadings and uplift forces are all considerations when designing a barrel vaulted rooflight, skylight or atrium. All site specific forces (especially in adverse locations/conditions) should be provided. Curved glass rooflight wind loadings, snow loadings and uplift forces are all site specific and unless provided at sales stage the averages figures below will be utilised.

UK wind loadings tend to vary from 0.53 KN/m sq to 3.4 KN/m with a typical average of approx. 1.0 KN/m sq to 1.5 KN/m sq.

 

Snow loadings will also vary depending on your barrel vaulted rooflight application. Applications with surrounding walls and roofs above will have much higher potential loadings and snow loadings are normally not applicable for curved glass rooflight elements over 60 degrees. UK snow loadings tend to range between 0.6 KN/m sq to 2.0 KN/m sq with a typical average of 0.75 KN/m sq. When combined with maintenance loadings a live load figure of 1.5 KN/m sq is often utilised.

 

Uplift is rarely an issue (due to it acting against the dead load of the rooflight), however should always be considered. Some applications such as glass curved rooflights/atriums above large stair wells may have very high uplift requirements.

 

The barrel vaulted rooflights/atriums upstands must also be designed to take any thrust forces imposed onto the upstands as a result of the curved glass rooflights, skylights or atriums design. Sometimes tension bars may be utilsed across the barrel vaulted rooflights opening to mitigate such forces.

Typically Requested Inclusions

 

Typically requested barrel vaulted glass rooflight, skylight and atrium inclusions are:-

 

 

Gabled and Curved Upstand Interfacing Ends

 

Faceting Glass Designs (Utilising Flat Glass Units)

 

Chandelier Supporting Rafter Details

 

Rooflight Eaves Guttering

 

Trickle or Forced Ventilation

 

Stepped Edge Glass Units

 

Low Maintenance Glass Coatings

 

Man safe and Walk On Glass Specifications.

Contract Programming

 

It is imperative that contract programmes are confirmed via formal quotation issue and/or at the time of order placement. Barrel vaulted glass rooflights, skylights and atriums programmes vary depending upon size and production requirements. However are typically on an o/all programme (prior to site installation) of 8 to 16 weeks. This programme includes for the preparation of bespoke general arrangement drawings, however does not include for the associated approval period of such.

 

Due to the nature and cost of glass as a material, it is important that every effort is made to ensure that an architectural curved glass rooflight, skylight and atrium design is right. Now would therefore be an excellent time to contact our sales team, who are looking forward to casting some light over your requirements.

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