The Grosvenor Roof Lantern
Description - The Grosvenor roof lantern is our largest rooflight in our standard range of roof lanterns called 'The Classic Collection'. A very popular roof lantern for full width single-storey rear extensions. The roof lantern porportions not only allows natural light to flood below and into adjacent rooms but also adds significant volume / height.
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 Grosvenor roof lantern features 1no ‘double paned’ electric vent as shown 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 2205mm on plan.