Minimum Pitch For Roof Lights

The recommended pitch for skylight installation on a flat roof for many skylight applications on flat roofs there should be a minimum pitch or fall of 0 6 in 12.

Minimum pitch for roof lights.

Although the minimum recommended pitch for a flat roof skylight is three degrees for property owners requiring more efficient drainage from their new rooflights it is worth considering increasing the pitch of your new skylight to five degrees. This is enough to ensure that water will drain off the surface of the glass and avoid ponding. Glass inherently has a degree of flex when installed flat known as deflection and means that without pitching the rooflight up slightly at one end rainwater will accumulate and begin to pond on the glass. Artists commonly use north facing roof lights to allow cool light into their studios.

The loft space would be much larger with a roof pitch of 45 degrees. The recommended pitch for rooflight installation on a flat roof for many rooflight applications on flat roofs there should be a minimum pitch or fall of three degrees. This is easy to achieve by using your upstand to create the pitch required. This is enough to ensure that water will drain off the surface of the glass and avoid ponding.

This image shows a relatively shallow roof pitch of 15 degrees. Pitched roofs can also be used to incorporate roof lights angled in a specific direction or dormer windows. However you can only use this pitch with built up roofing or specialized synthetic roofing.