in most regions of the country, that means securing support posts to the foundation with code-approved metal connectors, or having the ends of posts set on concrete deck blocks buried at least 12 inches below grade the top of the soil .
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i see a lot of decks in this area mt being built using precast concrete post bases. they just set these bases on ground level and the 4x4 post sits inside a pocket with no anchors in the top of the post base. the bottom of the post base is about 12' x 12'. they even use these for the posts that support beams.
once you hang the ledger, joist hangers attach to the ledger for hanging the deck joists. in most cases, hanging a ledger board is easier with the help of an assistant. measure up from the point where bottom of the cinder block meets the ground and mark the block at the desired height of the deck.
deck blocks are simple. to use deck blocks, level the places where the block will be placed. using a mason's string level, add or remove soil beneath the blocks until they are level from end to end. be sure to pack the earth before replacing the block after each adjustment. ready to build. deck blocks are ready to have the edge of a 2 x 6 placed into it. for corners, deck blocks are built to accommodate 90 degree angles.
they are dimensionally true and uniform in texture. square concrete block with no large chips or breaks. use in foundations or above-grade masonry walls. uniform in shape, color and texture. meets astm c 90 specifications. used for mounting or supporting post. note: product availability may vary by store.
they must have a sufficient bearing area the area of the block that sits on the earth and be a minimum of 12-inches below grade, or below the local frost depth. they cannot, however, be simply placed at grade level. the connection of the deck support post to the blocks is not consistently regulated throughout the country.
universal design allows use of 4x4 or 6x6 posts; supports corners and cross framing members; for use in above grade applications; consult all local building codes prior to starting your project; size and weight are approximate; color may vary by production run, it is recommended to purchase the entire project at one time
if you do place the wood support in the concrete, then at least make sure the concrete comes above ground level and slopes away from the wood on all sides. finally, reinstall your stairs. hopefully you measured twice so that all you need to do is cut your supports to the right height and maybe drill some new holes for the bolts.
working with concrete. make sure you use 5,000 psi concrete mix. once you have poured half of the concreter into the tube you should consolidate it with a shovel or a piece of rebar to eliminate air pocket voids. pour concrete until it is overflowing the form tube and level off the top with a shovel.
if you are connecting the deck to the house you will more than likely need to pour concrete footings that will extend beyond the frost line to prevent the deck from heaving up with a frost. the required depth of your footing is determined by your local code.
the facts. if your soil is firm and the climate is suitable, you can place the piers directly on level ground to support your deck. in areas with soil and climate concerns, building codes might require you to pour a concrete base below ground to place your piers for extra support.
ledger boards attached to the house only help minimize the old school footings you need for an attached deck. also, the number of blocks does not equal the number of footings. blocks use 2x6 beams but the footings use 2x8 or 2x10. so the max spacing for blocks is 66' and you will need more than 3 blocks for a 16' x 16' deck.
fill in the spaces between the concrete pier blocks with landscaping fabric wrapped around the interior foundation piers. add 1 to 2 inches of gravel on top of the foundation.
depending on the size and the height of the deck, you may have to apply for special permits. step 3 taking measurements. use a measuring tape to take down the measurements of the platform deck. measure the length and the breadth and also keep in mind the height of the deck. most people like to have the height of the deck not more than one full step.
deck blocks. the cheapest deck foundations are concrete deck blocks that just sit on the ground. the blocks are usually less than $10 apiece. however, you must buy a lot of them to ensure the weight of your deck is spread out over enough soil surface area so that they don't sink.
see the process to build a deck using deck blocks. no digging. see the next step. re- building the deck using recovered materials from the original tear down. follow rick in the process of
use a trowel to fill the hole and slots in the deck block with concrete. push the 4×4 support cylinder, tape end first, into the concrete in the center of the deck block. picture 9: angle the steel base plate so it rests on the deck block, similar to picture 4.
we used concrete deck blocks as our base 52 of them for the extra support. those suckers are heavy. once we determined our ideal placement, we leveled out our square exterior frame. utilizing the concrete footings, we placed our pressure treated 2×6 lumber into the grooves to maintain their vertical position. think real life lincoln logs.
step 1. position four deck blocks, one at each corner of the area you plan to cover with the deck. use a tape measure to check the spacing to ensure that the front and back sides and left and right sides are equally spaced. adjust the blocks as needed to make them equal. also measure from corner to corner diagonally, both ways.
with the frame in place, i used composite shims on all of the foundation blocks as needed to bring the frame into level position. if you want to add a very slight pitch to the deck frame, say, to direct rainwater away from your home's foundation, now's the time to do it.
how to use deck blocks: deck blocks stand in for the posts or provide a foundation for a post. they should be laid out similarly to deck posts, with the caveat that the spacing should be a little closer together, around five feet or so beneath the beams.
how to use concrete footings for deck posts concrete is, in fact, the most used material for construction in the world and has been in use since the age of the roman empire. concrete is a mixture of aggregate sand and gravel combined with water and cement.
in this short video in pictures you'll see how to build a floating deck, a floating deck is a deck that is not attached to the house. it sits on the cement concrete blocks that made for this purpose.