http://www.AsktheBuilder.com founder, Tim Carter, demonstrates how to use an offset string to get a wood beam perfectly straight. For more DIY Shed building tips and information and to PURCHASE the actual plans for the shed in this video, click the following links: SHED PLANNING: http://www.askthebuilder.com/how-to-plan-a-shed/ SHEDS for STORAGE: http://www.askthebuilder.com/storage-sheds/ GARDEN SHEDS: http://www.askthebuilder.com/garden-sheds/ SHED RAMPS: http://www.askthebuilder.com/shed-ramps/ PURCHASE ACTUAL SHED PLANS: http://shop.askthebuilder.com/deluxe-two-story-shed-plans/