Some builders even choose to match it directly, especially if the shed's roof is attached to the house on the high side, and just one simple span pitch. another widely used method is to follow the house's roof pitch on one side, building the ridge off-center, then sloping down more drastically on the shorter side which will be closer to the house.. Factors that impact your shed roof design. roofing material types. plywood or osb is the most common materials used for the roof sheathing. it must meet the local codes for thickness (at least 3/8”), which is also based on the rafter or truss spacing. the pitch of the roof determines the roofing material you can use.. Three important considerations for building a shed roof roof pitch. one thing you never want to do when designing your roof is build one with a pitch lower than 3-12. this means that for every horizontal run of 12", you need at least 3" of rise. when you see this detail below, it is referring to the pitch of the roof..
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