Carport Minimum Roof Pitch. I seem to recall a builder telling me there needed to be a 20mm drop for every metre of roof length. Lean to carports or single slope car carports tend to look more integral to the home than a flat roof carport.
In the plans the maximum roof slope is 5 degrees. Anyone who wants to know how to make a flat roof have a pitch would somewhat assume that the job is tedious. There are some pros and cons to high and low roof pitches.
Minimum roof slopes (degrees) for a rainfall intensity of 190mm/hr sheeting/decking total roof run length (m) minimum roof slope (degrees) for sheeting/ decking maximum roof run length (m) at minimum 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 slope stramit® corrugated 5.0 6.0 17 exceeds the scope of this guide 5.0 19
Generally, minimum slope for water to run off is 1% (1/8 per 1'). How many legs, per side, are installed on carports, garages, and barns? You could also opt for a pvc flat roofing membrane. So a 4/12 pitch roof rises 4 inches for every 12 inches of horizontal run.