![]() ![]() Spacing for the joists is generally 16 inches from center to center. To help make it more clear we have a chart with the most common wood types and measurements based on 16 inch joist spacing. Your only job, aside from following those instructions, is to make sure you also stay within code compliance.įor lumber, though, it will depend on the type of wood you are using, as well as the size of the boards. Each brand will have their own requirements. When dealing with composite joists (see below) you will get explicit instructions when you place your order. Treated lumber is still the most common, but composite and PVC are making more appearances in new construction than in years past. The biggest factor here is the board material. The board depth in inches is the space in feet it can span.įor example, if you have a 2×8 inch beam, it can span 8 feet before another beam is required. Their spacing, though, is dependent on the depth of the boards. However, larger decks may require more beams in the middle section of the deck.Īs a general rule, the beams must span the entire width of the deck. Smaller decks can also get away with beams around the edge distributing the weight to the footing and posts. Southern Pine and Fir have a different beam spacing than Cedar and Red Pine. The board type will also be a factor in the beam spacing. Using two 2×8 boards instead of a single 4×8, for example. The general recommendation is to use two boards as they help distribute the weight and are generally stronger than a single board. The beam boards can be a single board or two put together. On a deck, these are the main sections of the frame that connect the joists and decking boards to the footings and posts. While you may or may not be forced to use metal flashing, whatever the material, be sure you comply. Building codes in these instances will be explicit on how many fasteners, what type and their spacing to use. If your deck is attached to the house, you will use a ledger. Other regions may allow a floating deck system that rises and falls with the temperature. Some regions require that deck footings extend beyond the frost line so the deck doesn’t rise during a freeze. In colder climates with snow, runoff and freezing ground temperatures, there will be a frost line. Make sure everything is in accordance with the building codes and you will be fine. The posts and anchors may be required to be a certain depth, a specific distance apart or using a certain fastener system. ![]() When framing out your deck, the joists and beams will need to be anchored. The styles and materials used are usually left up to you, but their position and attachment to the frame and joists is important. When planning the layout of your deck and framing, you need to account for both the steps and the railings. In most areas any deck or porch with more than two or three steps will require a railing. ![]() City codes will help your deck maximize support to prevent sag and collapse no matter the conditions. Temperatures, base soil and other factors go into figuring local span requirements. The composition of each city, state and region is different. Below we outline some of the major factors of building codes and what they mean for you. When doing any form of renovations or construction on your home, it is important to know the building codes for your city. ![]()
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