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www.homebuildin... Click on this link if you're interested in learning more about roof framing, building design and home repairs. This video will provide you with a simplified explanation of what a roof purlin system for house framing does and how it can be used to distribute the load of a large roof or roof rafters more effectively. This system would also allow for smaller size lumbered to be used and seems to be rarely used today, but was often used in homes built before the 1960s. Remember, any modifications to the original structure of a building might require a structural engineer and building permits.