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The Portland Roof Lantern

Description - The Portland roof lantern is ideal for those side return extensions due to it's long yet slim footprint, enabling maximum light into adjacent rooms below. It's beautiful long ridge has proved very popular for hanging pendant lighting from. If you are concerned about privacy, then just add some pinoleum blinds.

Construction - The principal construction is in engineered Sapele, a hardwood with excellent paint adhesion sourced from sustainable plantations (FSC accredited). Durable qualities such as exceptional rigidity, resistance to indentation, shock loads and bending, together with a natural resistance to wood rot and fungal attack, combine to make it the natural choice in framing roof lanterns. High-performance dual-sealed double-glazing units ensure optimum thermal efficiency, whilst factory finished aluminum rafter and ridge cappings, together with self- cleaning glass ensure low maintenance on the roof exterior.

Roof assembly - delicately moulded rafters and hips span between a profiled roof plate/sill and a generous ridge. Octagonal profile bosses form the abutment of converging ridge, hip and rafter assemblies. The arrangement of the rafters is as shown in the sketches below. The roof pitch is 25 degrees. Rainwater discharge is direct to the perimeter flat roof weathering surface. Conduit channels with flush fitting access covers are incorporated to accommodate concealed electrical cabling. The Portland roof lantern features 1no ‘double paned’ electric vent as per the example below.

Glazing – self cleaning high performance dual-sealed double glazed units comprise two leaves of 4mm clear toughened safety glass, a 16mm Argon gas filled cavity, and include soft-coat low-emissivity heat reflective coating to the cavity face of the inner-leaf. The thermal u-value of the roof glazing units is 1.2.

Finishes – Roof exterior: aluminum rafter, hip and ridge cappings factory finished in CLASSIC WHITE or SLATE GREY. Roof interior: factory finished sapele timber in CLASSIC WHITE.

Internal dimensions of curb upstand: 3295mm x 1660mm on plan.


The Portland Roof Lantern


3295mm x 1660mm

Principal Elevation of The Portland Roof Lantern


3295mm x 1660mm

Side Elevation of The Portland Roof Lantern


3295mm x 1660mm

Roof Plan of The Portland Roof Lantern


3295mm x 1660mm

Upstand Plan of The Portland Roof Lantern


3295mm x 1660mm

Section of The Portland Roof Lantern


3295mm x 1660mm

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