Minimum Roof Height For Dormer

A dormer window therefore is only used with steeper pitches that have a useable interior space in the ceiling area.

Minimum roof height for dormer.

Where a property already has a steep pitched roof the eventual loft conversion will be much easier and ideally you are looking for headroom in the loft of around 2 2 to 2 6 meters. There are minimum practical requirements for headroom which the designs for your loft conversion must be able to meet. The dormer s roof slope should be at least 4 in 12. I always recommend at least a minimum pitch of 1 in 40.

Fix your roof deck and you are done. Recessed dormer set into the roof a recessed dormer i like to call it a sugar scoop maximizes the height of the dormer face while minimizing the projection of the dormer roof above the main roof plane. You need to consider the slope requirements of each panel to determine this minimum slope. The minimum slope of a roof depends on the roof s profile.

The ideal scenario is if you can stand upright in the centre of your loft and raise your arm above your head without crunching your hand on the inside of the roof. Flush dormers tend to look boxy and flatter roof pitches make them appear even boxier. To assess whether you have the space to accommodate this measure the clear headroom of your existing space from the top of the joists to the bottom of the rafters. Express the slope of a metal roof by a ratio which indicates the pitch of the roof.

This translates into a fall of just under 2 5 on an 8 foot roof. You need to have a roof pitch that gives you at least the height of a window and then some. A shallow pitch cannot sustain a dormer window simply because the interior space makes a dormer window impossible.