Note: If your local building material supplier doesn’t have certain dimensions of lumber, you can always double the pieces to obtain the necessary total thickness. Home Deck Installation Cost Learn about home deck installation and building costs and what to consider when hiring a... Free Online Deck Designer Designing your deck is the first step in the deck … Sand can support up to 2,000 pounds, and clay is the weakest at about 1,500 pounds per square foot because it doesn’t allow water to drain. Therefore, take the total weight, divide it by 2 (=3960 lbs), and then divide it by the number of posts – usually 2 (=1980 lbs) or 3 (=1320 lbs). As mentioned earlier, you can use deck blocks to build a small deck. Step 2: Calculate the Size and Number of Beams. As a rule of thumb, use at least three posts for every 12 inches of railing. Search for: how many post needed for 16 x 16 deck. Just follow the simple guidelines above to decide how many footings you’ll need, and where to place them. The larger the beams, the fewer the footings you’ll need to use. The remaining weight is split between the supports planned. Large decks or structures on unstable soil will require poured footings or perhaps even a continuous foundation of poured concrete around (under) the entire perimeter. Click the "Customize" button above to learn more!  - 5/6/2017 10:17:48 PM -  reply. Many codes demand that deck posts be held in place by a specific type of post anchor. The shape of your planned deck is another important consideration. Use the footing and beam calculator to test your design. The disadvantage is that you can’t save money by tying into an existing foundation. Deck Material Calculator Here is a simple and universal deck material estimator to help you understand how much material is needed for your deck project. So I make the deck free-standing, 16" square by 12" deep footings, PB44's embedded in 8" columns on top of the footings, use two 4X6 beams parallel to the house (assuming a 12' projection)with the posts 6' apart, cross-brace all of that, with 2X8 joists cantalevering 2' past each beam. A standard deck will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch posts. Three things affect the number and the size of piers you use: 1. It needs a complete set of perimeter footings since it will be self-supporting and won’t tie into your home’s existing foundation. How to create a 16 x 16 deck design. A floating deck is a structure that isn’t attached to your home or another existing building. ( ie...just at ground level, whereby you can spike your 4x6s to it with a piece of 1/2 inch rebar....or you could raise the posts off the ground, and bolt 2x10s or 2x12s to the posts a la deck framing style) If you go with a pier/post foundation, you would still need joists to span across the 4X6 beams. Get started on your deck today! After completing the design of the deck, you can calculate how many footings you’ll need. How much a deck should cost. When laying out the joists, you may plan for placing them on 12” or 16” centers. Plans for how to build a 16x16 deck 8x10x12x14x16x18x20x22x24 DIY How to Build Deck using Deck Blocks NO DIG >>> Click Here!! Additionally, determine approximately how much total weight the deck will hold. That means that once you have the footings in place you need to install posts - which will support the beams - that in turn support the joists – that support the decking – and eventually you, your family and friends. I have buillt decks using only one outside 2x10 (bond) attached to the posts instead of having the carrier beams under the deck as shown in the sketch. However, you … When you’re building an attached deck for your house, fasten a 2 x 12” securely at the correct level. Consider the spacing, length of the railing and post thickness to estimate your materials. You'll need the post layout marked before you begin. Providing you are attaching one or more sides of your deck to the house, this is your tributary load. For an attached 12 x 12’ deck, you’ll need at least 3 footings, plus at least 2 more if you’re planning on building stairs with it. 16 x 16 Deck Kit. Deck post size is important. I want to build a 16x16 deck that is not attached to the house. If you wish to use this deck design, we recommend downloading the PDF version. For furniture and people, use 40 psf (pounds per square foot), and structural materials or dead load, add 15 psf. In this example, I’ll plan for 3 supports, and the beams will be made of two pieces of 2 x 8” lumber fastened together, and the span is 6’. The Best Way to Build a Deck Handrail How to build a treated wood handrail for a deck. For most situations, you will want to place footings and posts less than 8' apart. Next, calculate the size of the footings. By clicking GO!, you acknowledge that you have read Trex's. Step 3: Calculate the Number of Footings Dig 2-3′ deep holes and 14″ in diameter and then compact a layer of gravel to the bottom.