Understanding the Best Materials for Floating Deck Support

When it comes to installing a floating deck, one of the most crucial decisions you'll make is what to put underneath it. The material you choose will significantly impact the deck's stability, longevity, and appearance. Let's delve into the various options, their pros, cons, and installation processes to help you make an informed decision.

Before we dive into the materials, it's essential to understand that the primary purpose of what goes under a floating deck is to provide a stable base, allow for proper drainage, and prevent water from pooling beneath the deck. Now, let's explore the main options:

Gravel Base

Gravel is a popular choice for floating deck bases due to its permeability, which allows water to drain efficiently. It also provides a stable, level surface for the deck to rest on.

To install a gravel base, first, excavate the area to a depth of about 6 to 8 inches. Then, lay down a layer of landscape fabric to prevent the gravel from shifting and weeds from growing. Finally, spread the gravel evenly, ensuring it's level and well-compacted.

Crushed Stone

Crushed stone is similar to gravel but offers better drainage due to its larger particle size. It's an excellent option for areas with high rainfall or snowmelt.

Installation is similar to gravel. Ensure the crushed stone is well-compacted to provide a solid foundation for your deck. Also, consider using a larger size, like 3/4-inch or 1 1/2-inch, for better drainage.

Pavers

Pavers are another option for floating deck bases. They provide a solid, stable surface and can enhance the overall appearance of your deck. However, they can be more expensive than gravel or crushed stone and may require additional materials, like sand, for installation.

To install pavers, first, excavate the area to a depth of about 4 to 6 inches. Then, lay down a layer of sand, level it, and compact it. Next, lay the pavers in place, ensuring they're level and tightly fitted together. Finally, fill the joints with polymeric sand to lock the pavers in place and prevent weed growth.

Concrete Slab

A concrete slab can provide an exceptionally stable base for your floating deck. It's an excellent choice if you want a solid, level surface and don't mind the additional cost and effort required for installation.

To install a concrete slab, first, excavate the area to a depth of about 8 to 10 inches. Then, lay down a layer of gravel, compact it, and cover it with landscape fabric. Next, install forms to contain the concrete and ensure it's level. Pour the concrete, smooth it out, and allow it to cure for at least 72 hours before installing your deck.

Concrete Pier Blocks

Concrete pier blocks are a more affordable alternative to a full concrete slab. They provide a stable base for your deck and can be adjusted to ensure the deck is level.

To install concrete pier blocks, first, excavate the area to a depth of about 4 to 6 inches. Then, lay down a layer of gravel and compact it. Next, place the pier blocks in a grid pattern, ensuring they're level with each other. Finally, adjust the height of each block as needed to ensure the deck is level.

In the end, the choice of what to put under a floating deck depends on your budget, the local climate, and the desired appearance. Regardless of your choice, ensure the base is well-compacted, level, and allows for proper drainage to protect your deck and extend its lifespan. Happy building!