Building Upstand For Roof Lantern

The korniche aluminium roof lantern engineered and developed by made for trade specifically with the trade and installer at the.

Building upstand for roof lantern. The job of an upstand sometimes referred to as a kerb is to lift the glass element of your rooflight off of the roof s surface and is required by building regulations for safety and weathering reasons. For every roof lantern we supply we will provide a plan and section drawing detailing the correct measurements for the builder to work to. Obviously written communication with drawings plan and section is absolutely essential in order to ensure good detailing between our roof lanterns and the builder s supporting kerb upstand. The cut ends of the rafter joist will need to have new support introduced usually achieved by fixing two pieces of timber together which span across the new opening on either side.

To install a rooflight in a roof generally entails cutting part of one or more of the roof s rafters or joists away. These double timbers are called trimmers. The upstand must be at least 150mm in height and should a minimum pitch of at least 3 degrees. Screw a timber down around the hole approx 100mm high and 70 mm wide making sure the size of the hole does not change.

How to do the timber to timber up stand. All our roof lanterns shown on this website are designed to be fixed onto a kerb like detail which rises proud of the supporting flat roof assembly precisely at the open edge of the lantern aperture. Set out the timbers on the flat roof leaving a hole where the roof lantern will be fitted and allowing enough room for spotlights if required. Current building regulations state that the upstand must protrude at least 150mm above the finished roof surface and are typically made of timber.

Measure the timber to timber hole and deduct 30 mm from the length and width this will make the roof lantern overhang inside 15 mm all the way around to allow room for plaster work see diagram. Upstands need to protrude by a minimum of 150mm above the roof and have a pitch of a minimum of three degrees. An upstand is the fixture that keeps the glazed unit from coming into contact with the surface of the roof and is needed for most building regulations. The roof lantern upstand in detail.

Upstands also help protect against rainwater bouncing up off the finished roof surface. Upstands are used to keep the glazed section of the rooflight off of the roofs surface. Rainwater can build up on a roof during heavy storm events and it may be stating the obvious but unless checked this water could spill into building and saturate construction elements electrical installations as well as internal finishes and effects. Sponsored by made for trade.

Darren collins 4th september 2017.