A ‘Flat Roof’ is normally a low pitched roof (below 5 degrees) that has a Bituminous, Asphalt, Lead, GRP, Single Ply or Liquid Applied Solution to waterproof it.
Any Sky Lights that are fitted within this Flat Roof system would normally require an upstand/builders kerb and that too would require waterproofing normally to an upstand height of 150mm.
An upstand or builders kerb can be pre-formed on Flat Roof using timber, concrete or metal but similarly can be purchased along with the Skylight element to offer a package. Purchased upstands or builders kerb would normally be made from uPVC or aluminium. It is important to make sure the upstand is thermally efficient thus limiting any positional issues
The majority of Flat Roof Skylights have either a glass or polycarbonate element for the glazing. Each element has it owns features & benefits as well as reasons to use one rather than the other. Glass will offer clean lines but polycarbonate will offer strength.
Ventilation can be incorporated within a Sky Light which can be an important choice, as failure to include this within your original design may be costly to re-install at a later date. Some local authorities may require a minimal air-flow and they will advise you of this within their planning permission. Ventilation would normally follow two main options in either
MANUAL or ELECTRICAL operation.