Building a Boardwalk | This Old HouseBuilding a Boardwalk. The best way to build a boardwalk. By This Old House magazine. Q: I'd like to run a grade-level walkway from my house to an outbuilding. I'm thinking about using composite decking on its surface, but what is the best way to frame it? Mark Tylkowski, aurora, Nebr. a: tom Silva replies: This is a simple project you can even build in sections as you have time. to begin, remove any sod from the path, and dig down an extra couple of inches. Fill in this area up to ...