What is the proper way to plumb a deck after it is completed? Should a sledgehammer be used to plumb deck support beams after it is finished? Our homebuilder "plumbed" our deck support beams using a sledgehammer. Some support beams have been moved up to 4 inches (beams are not cemented in the ground). It appears to have twisted and spaced some of the wood that the deck support beams are connected too. What are the potential damage issues, if any, we may run into in the future?