How to fit a skylight

Velux roof windows must be minimum 15 degree pitch for standard flashings. There is a system to 10 degree pitch with velux flashings. There are specific concrete tiles that can be installed at 12.5 degree pitch with 100mm headlap from suppliers depending on rafter length and prevailing wind conditions. I would suggest turning this 15 degree pitch into a flat roof system (felt/fibreglass/rubber) may prove less problematic in future.

Velox roof lights need a minimum of 15 degree pitch , these roof tiles will work with that pitch Marley Thrutone Slate. Redland Regent. Redland Cambrian Slate. Redland Grovebury. Redland Landmark Double Pantile. Marley Mendip. Marley Wessex. Marley Melodie Tile.

The first part is good. Velux windows work well at 15deg. There are a range of tiles to suit. You have to take care with the front and back flashings to get the tile runs correct. Correct flashing is vital.o

That pitch is borderline, but acceptable. Melodie interlocking pan tiles can go as low as 12.5 degrees Marley mendip / Wessex ... 15 degrees If your worried you could always double felt it