hole size for 4x4 deck post

Remember to follow local code for deck posts. There are several methods for setting posts. One way is to pour concrete in the post hole set the post on the concrete and backfill with gravel. To help prevent rotting this deck will have wooden posts attached to concrete footers above ground. 【Get Price】

The diameter of your post hole should be three times the diameter of your post. So if you’re planning on using a four-inch round or 4x4-inch square post your post hole will need to be 12 inches in diameter. For a six-foot-high fence post we would need a hole that’s 36 inches deep and 12 inches in diameter. 【Get Price】

Dig an 8"-diameter hole at least 6" deeper than your area's frost line for each 4x4 post using a power auger hand auger or post-hole digger. A 6x6 post requires a 10"-diameter hole. Shovel a 6" layer of gravel into the hole to provide drainage. Now put the strings back on the batterboards but move them toward the outside of the layout by ... 【Get Price】

That is assuming you are using a 4x4 which is 3.5" square. You will have to wait for the cement to cure and then back fill over top. Since the post will be embedded in the concrete and in the soil using a post treated with preservative for ground contact is a must. This method has the main benefit of saving a lot time mixing cement. 【Get Price】

Dig the first post hole. Local building code will dictate post hole depth and diameter. Typically the diameter is triple the width of the post (12 inches for a 4-inch-by-4-inch post). The hole depth should be below the frost line. Typically this means to a depth of 30 inches (24 inches for post 4 inches for gravel and 2 inches below ground ... 【Get Price】