Site prep for EOS Roof Skylights
Our EOS roof lantern can enhance any flat roof within a home, but the flat roof needs preparing specifically for this impressive roof lantern product. The roof lantern itself will sit on a timber upstand that needs creating before the roof lantern can be installed.
The timber upstand (often referred to as the ‘kerb’) needs to be a minimum height of 150mm to comply with building regulations and we recommend that it is manufactured to a minimum depth of 70mm. When you order your EOS roof lantern you will receive an easy to understand drawing with instructions on how to build the perfect sized upstand for the roof lantern that you have ordered.
The rest of the flat roof needs to be covered with a plywood deck, which then needs to be covered with a weatherproof membrane such as GRP or fibreglass.
Before you begin the installation of your new roof lantern, you need to have the timber kerb installed, we also recommend that you apply your weatherproof roof membrane to the flat roof deck prior to the installation of the roof lantern. The membrane is essential to ensure you have a weatherproof flat roof & upstand ready for your new roof lantern to be installed onto.
If you have added your roof membrane on top of your plywood deck already, please ensure that you leave enough excess material around the timber kerb to flash the roof lantern upstand. This can be folded back out of the way until your roof lantern is installed.
You are now ready to begin the installation of your new roof lantern.
Measuring & creating your timber upstand
The size of the external opening should reflect the exact size of the roof lantern you have ordered. This means the measurements for your EOS roof lantern are the external measurements from the outside edges of your timber upstand. For example, the roof opening should measure exactly 4m x 2m from the outside edges of your timber upstand when ordering a roof lantern at 4m x 2m.
The depth of your timber kerb should measure a minimum of 70mm in width, to match the width of our EOS roof lantern, which will sit on the kerb. We recommend a minimum height of 150mm from roof level, but this can be increased if required.
The upstand should be perfectly level and the corners all square. We recommend that you check the corners have a 90° angle, by measuring it diagonally from corner to corner. If both dimensions match, then your timber upstand should be square.
Once you have a level and square timber upstand you are ready to begin the weather proofing of your roof prior to installing your new roof lantern.