Swimming pool glass roofs in Dorset | Purbeck

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Two oversized swimming pool glass roofs in Dorset form the principal daylight feature within the dedicated spa and pool area at Purbeck, a five-bedroom replacement dwelling by UX Architects. Located in the Purbeck countryside within an Area of Outstanding Natural Beauty, the stone and timber-clad home required large overhead glazing that could introduce open sky views without compromising the restrained architecture or sensitive landscape setting.

IQ Glass designed and installed two fixed frameless-effect structural glass roofs, each formed from three silicone-jointed panes and supported by low-iron structural glass beams. Solar control glazing, a marine-grade finish and heat soak testing were specified throughout the roof package. The completed house received the International Property Awards 2022–2023 award for Architecture Single Residence.

Products Used

Project Partners

UX Architects

Location

Purbeck

Swimming pool glass roofs in Dorset for an AONB replacement dwelling

The design challenge was to bring substantial overhead daylight into the pool and spa area of a luxury replacement dwelling while respecting its position within an AONB. The roofs needed to frame uninterrupted sky views and maintain the minimal architectural language of the house, but the scale of the openings meant that a conventional single-pane rooflight or opaque support structure would not have been appropriate.

Both glass roofs span approximately 7m in width. The larger roof extends to almost 5m in length, while the second is just under 2.5m long. With the glazing panels weighing just under 1,800kg in total, the project sits firmly within the requirements of oversized architectural glazing, where glass weight, support positions, access and lifting logistics must be considered alongside the visual design.

The technical challenge was to control deflection across the large glass areas without introducing visually heavy steelwork beneath the roof joints. The pool environment also required a specification that addressed long-term durability and solar gain, so the supporting glass, coatings, frame finish and installation method had to be developed as one coordinated swimming pool glazing package.

Low-iron glass beams for 7m-wide roof spans

Each roof was formed from three silicone-jointed structural glass panes. Low-iron structural glass beams were positioned beneath the joints to support the oversized roof panels and counter the effects of deflection while retaining a transparent internal appearance.

The glass beam design allowed the supporting structure to remain visually consistent with the roof above rather than introducing an opaque beam line through the pool space. The depth, laminate build-up and fixing arrangement of structural glass beams are calculated in response to the span and imposed loads, making this a project-specific engineering element rather than a standard decorative detail. Further information on this type of support can be found in IQ Glass’s guidance on unsupported glass beam detailing.

Crane-assisted lifting was required to place the large glass units safely and accurately. The handling strategy formed an essential part of the design and installation process because the overall size and weight of the panes left little tolerance for adjustment once the units were positioned.

Marine-grade and solar control glazing over the pool

The pool glazing package was specified with a marine-grade finish due to the internal swimming pool environment. All visible framing was finished in RAL 9005 Matt, providing a consistent dark perimeter around the overhead glass while supporting long-term durability.

Solar control glass was specified across both roofs to reduce solar heat gain and glare while retaining the high levels of daylight required within the spa and pool area. This was particularly important because the expansive overhead glass is exposed directly to the sky and could otherwise place additional cooling demands on the internal environment.

Every pane was also heat soak tested as an additional quality measure for the large toughened glass units. Heat soak testing helps reduce the risk associated with nickel sulphide inclusions before the glass is installed in a difficult-to-access overhead position.

Performance considerations

The performance strategy for these swimming pool glass roofs in Dorset was driven by structural span, glass weight, overhead safety, solar control and the environmental conditions within the pool area. The multi-pane structural glass roofs use silicone-jointed units with transparent beam supports, allowing the loads to be managed without losing the frameless-effect appearance required by the architecture.

Overhead glazing requires a laminated inner pane as part of the safety specification. The glass roof system also incorporates thermally broken perimeter framing, helping maintain insulation around the roof edge while reducing the risk of cold bridging at the junction with the surrounding construction.

Solar control coatings help moderate heat gain across the large roof areas while preserving daylight and sky views. IQ Glass’s technical guidance on controlling solar gain in highly glazed spaces explains why coating selection must be coordinated with glass area, orientation and internal use rather than treated as an isolated product choice.

The marine-grade finish, heat soak testing and crane-assisted installation each respond to a separate performance requirement. Together, they allowed the two roofs to combine large clear spans, pool-environment durability and accurate installation within the restrained architectural language of the award-winning house.

Technical details

Structural glass roofs: two fixed frameless-effect roofs, each formed from three silicone-jointed panes; both approximately 7m wide; largest almost 5m long and second just under 2.5m long; total glazing weight just under 1,800kg
Roof glazing performance: structural roof glazing can accommodate glass thickness up to 37.5mm DGU or 62.5mm TGU; typical Ug 1.1 W/m²K; example system Uw 1.2 W/m²K; laminated inner pane required for overhead safety
Structural glass beams: low-iron toughened-laminated glass supports used beneath the roof joints; beam depth, laminate build-up and fixings calculated to suit the project span and roof loads
Glass and frame specification: solar control glazing to both roofs; marine-grade finish due to the pool environment; all panes heat soak tested; visible framing finished in RAL 9005 Matt
Installation and handling: mechanical lifting and crane assistance required for positioning the oversized roof panes; crane provision coordinated separately as part of the site installation strategy

Purbeck demonstrates how swimming pool glass roofs in Dorset can use multi-pane structural glazing and transparent glass beams to cover substantial spans while retaining daylight, sky views and a minimal internal appearance. This approach is well suited to architects and specifiers working on luxury homes, spa buildings and swimming pool glazing projects where glass weight, structural support, solar control and pool-environment durability must be resolved together.

To discuss a comparable project, contact IQ Glass for technical advice on structural glass roofs, structural glass beams and oversized roof glazing.

Associated Products

Solar Control Glass

Solar control glass is used in buildings to reduce heat gain and glare from the sun. It can also help to conserve energy and improve occupant comfort and productivity.