Most codes require that at least one half of the ceiling in a room be 80 inches or higher and that the ceiling over the other half have a minimum height of usually 48 or 60 inches.
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.
I always recommend at least a minimum pitch of 1 in 40.
You need to have a roof pitch that gives you at least the height of a window and then some.
The minimum slope of a roof depends on the roof s profile.
There is no fabrication of roof trusses required.
You need to consider the slope requirements of each panel to determine this minimum slope.
This translates into a fall of just under 2 5 on an 8 foot roof.
Fix your roof deck and you are done.
A shallow pitch cannot sustain a dormer window simply because the interior space makes a dormer window impossible.
Express the slope of a metal roof by a ratio which indicates the pitch of the roof.
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.
A third consideration that will effect the size and shape of the dormer is the minimum ceiling height.
The profile is the shape taken by the sheets when you bend them to form panels.
A ceiling height of 1 9 2 0 m once the conversion is complete.