There is no fabrication of roof trusses required.
Minimum roof height for dormer.
The profile is the shape taken by the sheets when you bend them to form panels.
This translates into a fall of just under 2 5 on an 8 foot roof.
There are minimum practical requirements for headroom which the designs for your loft conversion must be able to meet.
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.
A shallow pitch cannot sustain a dormer window simply because the interior space makes a dormer window impossible.
I always recommend at least a minimum pitch of 1 in 40.
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.
Fix your roof deck and you are done.
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.
Express the slope of a metal roof by a ratio which indicates the pitch of the roof.
A third consideration that will effect the size and shape of the dormer is the minimum ceiling height.
A ceiling height of 1 9 2 0 m once the conversion is complete.
You need to have a roof pitch that gives you at least the height of a window and then some.