Vario by velux offers a modular flat roof solution called the unlimited rooflight.
How to construct a flat roof with a roof lantern.
Roof lanterns are an alternative to flat glass rooflights the glass is angled to a pitch creating two triangular end pieces and two trapezoidal long sides which create the distinctive roof lantern shape.
This solution allows you to combine as many modules of up to 4 square metres as you want which equals most lantern sizes.
So any timber joists that are used need to be strong enough to support this weight.
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.
As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.
Whether you are wanting to flood a room with natural light or star gaze on clear night from the comfort of your sofa a roof lantern would be the perfect addition to any single story extension or bungalow with a flat roof.
How to install a roof lantern on a flat roof.
Adding a roof lantern and flooding a room with natural light can be a great way to make a room feel more spacious.
Cut and frame the opening.
Our roof lanterns have a distinct and unique design that utilises the latest state of the art technology in structural silicone glazing.
There are several methods and materials for the design of the exterior surface of a warm or cold flat roof.
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.
This kerb is called an upstand the outside face of which allows the flat roofs external surfacing to lap up and form a weather tight junction.
Roof lanterns are a great way of bringing natural light into a room where wall space may be limited.
Make sure it s lying horizontally across the exposed rafters and that the edges are flush with the edges of the end rafters.
Hot tar and gravel.
Cutting the opening requires drilling a hole in the roof and cutting the opening with a circular saw.
If you are installing a new roof lantern you will need to cut the roof as required.
You could for example combine three modules of 3000mm x 1000mm which equals 9 square meter of clear sky view.
If you are replacing a roof lantern you ll need to remove the old one.
Old asbestos roofs are often replaced with flat roofs.
For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.
If you are adding a skylight to a flat roof you must decide on whether to construct your own upstand or purchase one from your rooflight supplier.
The 3 most common materials used for flat roof construction.
Sizes of joists needed for flat roof construction.
Drive a nail into each corner of the plywood to hold it in place temporarily.
Cut back the roofing.
