11 Best Of How To Build A Stand Alone Deck With A Roof Best Resolution Image. For proper support the joists must be spaced no more than 12 inches apart. Some freestanding decks stand alone in an open area.
Frame up a box the size of the outer dimensions of your deck using 2 by 4 inch lumber. Measure 3 feet from where the lines intersect and make a mark on the string line. Attach it with 3-inch galvanized framing nails.
I used a powered auger to dig the 2-foot post holes and slid cardboard footing tubes into the holes to retain the concrete.
Cut your 12-inch deck facing to size if needed for each side of the deck. If you have an existing deck its possible to add a roof to it by installing additional supports. Above-ground pool decks are often built freestanding in this fashion. Measure between the 3-foot and 4-foot marks and adjust the line until the marks are exactly 5 feet apart.