Heavy timber construction is a building method that uses large, rustic, heavy sawn timbers or structural glue laminated lumber that is joined together with traditional mortise and tenon joinery or modern metal joinery. Also known as post and beam construction or mill construction, timber framing in floor and roof assemblies dates back to the beginning of civilization. The first completely self-supporting timber frame structure is believed to have been constructed during the 10th century. Developed since that time, the building method was brought to North America in the seventeenth century by European settlers.