Mansard roofs with nearly vertical faces can boast a pitch of 20 in 12.
Pitched roof domes.
Keep in mind the rafter approach can take several days and up to 3 weeks to complete a suitable frame.
The largest roof dome built in western europe since the pantheon is brunelleschi s octagonal brick roof dome for the florence cathedral or ii duomo in florence italy completed in 1436.
The 45 degree roofs seen on a frame houses are 12 in 12 but roofs can be even steeper consider the mansard roofs introduced by french second empire architects in the middle of the 1800s.
Triple skin polycarbonate clear or frosted and pvcu 300m splayed upstand.
Keylite flat roof domes can be supplied with a clear or frosted finish.
Curb mount fixed glass curb mount venting glass.
If going the non trussed route for a moderate to low pitched roof the rate per square foot of framing including labor is a range of 11 to 22.
Pitched roofs begin with with slopes greater than 3 in 12.
Curb mount pitched glass for flat or pitched roofs designed to mount at a minimum 3 12 pitch onto 1 1 2 wide flashed curb by others.
A roof comprising a mono pitched roof or for larger buildings series of mono pitched roofs with vertical surfaces glazed and pitched upward in general terms away from the equator though other directions suit if direct sunlight is desired and where rooftop access may otherwise be impracticable.