Metal Roof Skylight Flashing Detail

A crucial part of our complete system.

Metal roof skylight flashing detail. Velux edm deck mount skylight flashing is designed velux edm deck mount skylight flashing is designed to work with metal roofing. Step flashing is much more reliable. The sill apron features pliable pleats that form to the roof and the kit includes adhesive underlayment that provides an additional layer of water protection for a weathertight installation. Metal roofing manufacturers can explain how to flash their products against skylights and other protrusions.

The more sides and the longer your skylight has the more roof flashing you will need. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Velux skylight flashing kits are designed to shed water without relying on sealants that can break down over time. We offer a variety of skylight flashing systems to ensure a weathertight fit for virtually all roof types and slopes.

With metal roofing use the manufacturer supplied kit or have the roofing contractor fabricate a matching flashing from the metal roofing material. Roof pitch the metal roofing panels shown in this manual require a min imum slope of 2 ʺ per foot to ensure proper drainage. Cut the metal flashing based on the length you determined but adding an extra two inches. Some roof conditions such as valleys may require a longer endlap and or a larger flashing to properly drain moisture from the roof.

Refer to the rain carrying table in this booklet for the maximum allowable panel length per slope that will provide adequate drainage. If it s carefully removed when the old roof is torn off it should be reusable. With asphalt shingles avoid skylights that provide only a continuous side flashing which relies on roofing cement for a waterproof seal. You will need one roof flashing for each side of your skylight.

Flashing a skylight may involve sealant as one line of defense against water infiltration but above all there must be good flashing. If not you ll have to buy new flashing 50 to 100 either from the skylight manufacturer or from a roofing company that has a metal fabrication shop look under roofing in the yellow pages or online. It cannot be flush mounted. Most residential skylights sit on a raised curb made watertight with metal flashing.

A skylight in a metal roof must be curb mounted in order to be properly flashed. Step 2 prepare the metal flashing.