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if you were to bind up all your rafters (“logs”) together and float them down the river, you would have made a raft, and you yourself would become a rafter.
A rafter is one of a series of sloped structural members such as steel beams that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof shingles, roof deck, roof covering and its associated loads. A pair of rafters is called a couple.
Three common types of rafters include common rafters, hip rafters, and valley rafters. Common rafters span from the wall plate to the ridge board, hip rafters form the lines of the intersection at the corners of a hip roof, and valley rafters are used where two sloping roof sections intersect.
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A sandwich panel is a prefabricated building material made of a lightweight insulating core sandwiched between two rigid, strong outer layers.