![]() ![]() Outline the location of the sandwiched beams on the edge of the rafter. This design calls for a custom feature in which the rafters are notched to fit down over the joists this step can also be omitted to simplify construction.Ĭut the 2x4 rafters to length. Position the first rafter across the tops of the beams so the overhang is uniform on each end. ![]() Here again, the exact rafter length is up to you, but generally, the rafters should not overhang the outside of the joists by more than about 1 foot. This arbor design calls for six 2x4 parallel rafters to span across the beams, overhanging slightly on each side. This is easiest to do before you bolt the beam boards into place. If the posts are extending up beyond the tops of the joists, you can now cut them off flush, using a handsaw, jigsaw, or reciprocating saw.įor a decorative touch, the ends of the beams can be cut to an angled or curved shape with a jigsaw. Each beam pair should be secured to its post with two bolts. When the beam pieces are positioned as you want, drill a pair of 1/4-inch holes through the posts and sandwiched beams, then insert lag bolts through the holes and secure the three layers together with washers and nuts. Use a long straightedge and level to ensure that the beams are level from side to side. ![]() Position and temporarily screw the beams to the posts, taking pains to make sure they are perfectly level and uniformly aligned with one another. This measurement, too, is up to you, but 7 to 8 feet is ideal, as it gives enough room for people to pass beneath. Next, measure up from the ground along each post, and make a mark indicating the bottom of the joists. If the posts are spaced 8 feet apart, in other words, the beams should be 10 feet long to allow for a 1-foot overhang on each side. (For small arbors, these beams can be made from pairs of 1-inch by 6-inch lumber if you prefer).įirst, cut four 2圆s to the desired width of the arbor "roof." The size is up to you, but it is typical for the beams to overhang each post by about 1 foot. The two cross beams for your arbor will consist of a pair of 2-inch by 6-inch beams sandwiched around each of the posts near the top. You can do this if you want, but remember that an arbor may be subject to winds, and the sturdier the post footings, the more secure your arbor will be. In some communities, it is standard practice for posts on fences, arbors, and other outdoor structures to be anchored by packing gravel around the posts rather than using concrete. Take care to prevent the posts from being bumped or moved as the concrete dries. When all posts are installed, allow the concrete to dry overnight. Now proceed to the final two posts, again making sure the spacing is uniform and that all post faces are square to one another. A long straightedge board can be used to ensure that the faces of the posts are aligned. It is critical that you install it so the front faces of both posts are aligned. If the post wobbles or will not stay upright, you can anchor it with diagonal stakes attached with screws. ![]() Once the post is positioned properly, avoid touching it as you proceed to the other post. As you add concrete, check the post with a level to make sure it remains perfectly upright (plumb). Lightly tap the side of the post with a hammer this will settle the concrete and eliminate any air pockets. Have a helper hold the post upright (or stake it in place), then shovel wet concrete into the hole up to ground level. Consistency should be dough-like-not too wet, nor too crumbly. Mix concrete in a wheelbarrow or mortar box. The Spruce Home Improvement Review Board. ![]()
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