How Many Support Posts For A Deck
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In cold areas many codes require footings that extend below the frost line so that the deck does not get raised up in the winter by frost heave.
How many support posts for a deck. I am building a 10 x12 deck not attached to a ledger board. Even if your deck is simple footings should always be placed at a distance of not more than 8 center to center apart. According to the old af pa table a 4 foot douglas fir 4x4 post can support 256 square feet of deck. Other departments might allow a floating deck with shallower footings that rise and fall during freeze and thaw.
A span is the unsupported distance between two posts. How many footings do you need for a 12 x 12 deck. As the lengths reach to eight feet or longer you should highly consider upgrading your posts to a 6 6 size. I just want to put up two 6x6 posts with titan wood post anchors either 35 or 70 apart read more.
Many codes demand that deck posts be held in place by a specific type of post anchor. While a 16 foot by 16 foot backyard deck for recreational purposes such as an outdoor kitchen and general lounging may only require deck posts spaced every 7 feet a larger deck may require that the spacing be narrowed down to within 5 feet. Maximum cantilever of a 2x8 is 24 at 16 o c. Install bracing cut from the same 2 x material you used for the joists 2 x 8 for this deck between joists in the middle of the frame to support parting boards.
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. Maximum cantilever of a double 2x8 beam past a support post is. Using the 2005 nds i calculated that the same post can support 231 square feet so it would seem there s no problem using 4x4s to support say an average sized intermediate stair landing. So build your deck the right way from the ground and posts up.
Parting boards also known as pattern boards add a distinctive look and can eliminate the need to butt boards together to span the width of the deck. I am looking to install privacy screens on my concrete patio. If you are planning on installing a hot tub or porch on top of your deck you will usually need more footings and posts to support the additional loads. Apr 28 20 11 17 am.
For most situations you will want to place footings and posts less than 8 apart. Hot tubs and other heavy objects will require additional footings and larger deck beams. The length of the posts can also influence which size post will work best. Maximum joist span of a 2x8 is 10 6 at 16 o c.
Total height of low level ground level deck. Deck post size is important.
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