![]() ![]() Many roof material manufacturers have minimum pitch ratings for their products. 2×4 rafters are not strong enough for low pitched roofs under any circumstance, so avoid if you are building a shed with a flat or very shallow roof. If you look at the chart linked above, you’ll notice that for roofs that are less than 3:12, the chart does not include 2x4s as an option. ![]() What does 3:12 mean? It means a roof that rises 3 inches for every 12 inches of horizontal run. When talking about framing a shed roof with rafters, you’ll first need to know how steep your roof is – in other words, what is the pitch or slope of your roof? Most rafter span charts are organized into 2 sections: roofs with a slope less than 3:12 and roofs greater than 3:12.
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