How To Backfill Under A Deck

Backfilling is the process of filling in a space behind or below something with earth, rocks, or other material. Backfilling under a deck is an important step in preventing moisture damage and creating a level surface for walking or sitting. The following steps will help you properly backfill under your deck:

How To Backfill Under A Deck

There are a few different ways to backfill under a deck, but the most common is to use gravel or crushed stone. This can be done by spreading a layer of gravel or crushed stone over the entire area that will be covered, then using a rake to smooth it out. Alternatively, you can create a trench that is wide and deep enough to fit the size of stone you are using. Place the stones in the trench so that they are tightly packed, then cover with soil.

-Tools: shovel, rake, wheelbarrow -Material: fill material (dirt, gravel, sand)

  • Clear the area of all objects including plants, furniture, grills, etc
  • Dig a trench around the deck perimeter using a spade or post hole digger. the trench should be about 8 inches deep and 12 inches wide

below When backfilling under a deck, it is important to use a material that will not erode or compact over time. A good choice for backfilling is a coarse gravel or crushed stone. This will help to keep the area under the deck level and stable.

Frequently Asked Questions

How Do You Fix A Muddy Area Under A Deck?

There are a few ways to fix a muddy area under a deck. One way is to install a drainage system. This can be done by installing drainage pipes under the deck and then covering them with rocks or mulch. Another way is to create a raised bed under the deck. This can be done by building a simple frame out of lumber and then filling it with soil.

What To Use To Fill In Under The Deck?

One can use a variety of materials to fill in under the deck, such as gravel, crushed stone, or recycled plastic.

Should You Put Gravel Under A Deck?

There is no definitive answer as to whether or not you should put gravel under a deck. Some people believe that gravel helps to drainage and protects the decking boards from rot, while others find that the gravel can be a tripping hazard. Ultimately, it is up to the homeowner to decide if they think the benefits of using gravel outweigh the potential risks.


Backfilling under a deck is a fairly simple process. Once the area has been cleaned and leveled, use a shovel to fill in the area with soil. Be sure to tamp the soil down as you go, so that it is packed tightly. You may also want to spread a layer of mulch over the top to help keep the soil in place.

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