Free Helpful Apps for Builders! Hammond Lumber is always looking for innovative ways to help growing builders be more prepared and organized in the industry. Apps can sometimes be just as helpful to your business as the tools you bring to the jobsite, they have become part of the tool kit mix! Build up your tool kit by downloading these apps on the App Store or Google Play! Weyerhaeuser – Trus Joist Mobile Document Library Are you on a job site and need to review an installation guide for Trus Joist beams, columns or headers?