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lumber spans for roofs, lumber span charts for roofs, timber sizes for roof span, allowable spans for lumber, flat roof timber spans, maximum span for lumber, span limits for lumber, lumber size and span, span chart for lumber, lumber span chart for rafters, construction lumber span chart, span loads for lumber, lumber size span chart, span strength of lumber, conventional lumber span chart, what size lumber for 12 foot span, what size lumber to span 15 feet, framing lumber span chart, lumber rafter span chart, lumber load span chart, timber roof span tables, roof long span size
