The average roof pitch depends on the type of structure we`re talking about,
meaning if it`s a house,
a barn or what not,
and where you are located,
since european homes have different pitches than american or canadian homes usually.
Unattached garages tend to have standard roof pitches of 10 to 12 degrees.
In northern Europe,
standard roof pitches vary from 30 to 50 degrees for homes.
a low slope or roof pitch is less than 30 degrees.
A normal slope is usually from 30 to 45 degrees.
A steep slope is a roof with a pitch that is greater than 45 degree.
These are the most expensive roofs to shingles.
As a general rule of thumb for determining your labour costs,
multiply the roof pitch by the number of bundles (or squares)
to determine the cost of labor,
then add 10-15% or so on top of that.