Precast concrete deck blocks are popular for building decks. Some are made with notches designed to hold standard-sized posts, beams and joists. Precast blocks available at home improvement centers are usually 12 inches square and 8 to 12 inches high.
What goes under a deck block?
Deck blocks should be installed on stable, non-organic material with good drainage. You can put gravel, sand, or limestone screening under a deck block. Deck blocks can also be set on poured concrete columns dug to below the frost level.
What are concrete deck blocks used for?
Deck blocks are precast concrete blocks used to hold up beams for supporting structures, especially floating decks. There are different types of deck blocks; some have notches to hold beams, joists, and posts, which makes them excellent for constructing freestanding decks (decks not attached to the building.)
Can you build a deck with deck blocks?
A backyard deck is an excellent way to expand outdoor living space, but decks can be complicated, time consuming and pricey. One way to build a ground level deck with simple construction, without breaking the bank, is to use prefabricated deck blocks for your foundation. Deck blocks can make deck construction simpler.
Are deck blocks a good idea?
Deck blocks are a good idea for low decks, decks around trees, areas with low frost levels and economical decks. It is a bad idea to use deck blocks when attaching the deck to the house, on stable ground or supporting elevated decks, pergolas or a roof.
How far apart should concrete deck blocks be?
Space the deck blocks at 4′ to 6′ intervals to offer the frame good support.
Do deck blocks sink?
The deck blocks can sink if the soil under them erodes for some reason or the weight is unevenly distributed. That’s why it’s a good idea to use more than less.
Can deck posts sit on concrete blocks?
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.
How much weight can a deck block hold?
All concrete blocks must support at least 1,700 pounds of weight per square inch according to standards published in 2003 by the international building standards non-profit.
How do you attach a deck to cinder block?
The deck-to-block connection is done with a ledger board attached to the block using sleeve anchor bolts. The bolts have a special sleeve that expands inside the block when the head is tightened against the face of the ledger. Once you hang the ledger, joist hangers attach to the ledger for hanging the deck joists.
How many decking boards do I need for a 10X10 deck?
For a 10×10 square deck, you would therefore need twenty-two 10′ deck boards. Dimensions for deck boards can vary depending on the look you want and the deck board type you use. However, the most common is a 5/4” thick by 6” wide deck board of any length.
How do you attach 4×4 posts to concrete deck blocks?
The 4×4 posts are inserted into and resting on top of a concrete decking block.
You can glue the posts in with strong glue or drill and screw through them. Glue is never to be considered a structural thing.
How far can you span deck blocks?
A single deck block can support 40 sq’ of deck. the maximum beam span between supports, the deck blocks is 8′ (2.4m), and the minimum is 4′ (1.2m) according to the residential deck guide. So, the max distance between deck blocks is 8′ (2.4m), and there is no need to have them closer than 4′ (1.2m).
Do floating decks need footings?
When it comes to floating decks, which are decks that are built very close to the ground, they don’t need any sort of footing. You can either use small concrete blocks and planks, or you can use a post that sets into a pre-formed hole.
Can I use deck pier blocks instead of footings?
Pier blocks can be used instead of footings for a ground-level deck not requiring permits. Piers blocks can also be used if the frost level depth is less then the height of the pier block.
How many concrete blocks do I need for shed foundation?
To build a shed, you will need 20 to 60 blocks for the foundation, depending on the size of your shed. If your shed is on unlevel ground, you will need more blocks to stabilize it. If you are building a 6ft x 8ft or smaller shed, concrete blocks are not required as long as the ground is level.
