Is it good to backfill with sand?

While both materials can be used for backfilling, PG&E sand is more suitable for backfilling utility line trenches. The reason is that it doesn't shrink or swell as condition changes, and is easier to dig up when maintenance is required. Both fill sand and fill dirt are commonly used in building and landscape projects.

serbu.ca - The Difference Between Fill Sand & Fill Dirt

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Fill sand and fill dirt sound similar by name but have different uses in building and landscaping projects. Before deciding which one to use, it helps understand how they are different in terms of properties and suitable applications. To help you choose, we’ll go over what fill sand and dirt are, as well as their advantages and disadvantages.

What is Fill Sand?

Fill sand is a common material used in both residential and commercial construction projects. Just as its name suggests, it’s a substance comprised of excellent particles of rock. These particles may have broken down into sand naturally over time or may have been run through crushing machines several times. Having been sifted down to the smallest sizes, fill sand has a very high compaction rating. A slightly coarser version of it is also called PG&E sand because it’s made for utility companies such as Pacific Gas & Electric Co. to backfill trenches.

What is Fill Dirt?

Just as commonly used, fill dirt is typically sourced from the subsoil that sits at least six inches below the surface, under the topsoil. It does not contain any organic or biological components that will eventually decompose, which means it’s unlikely to shift and settle over time. After the dirt has been collected, it is sifted multiple times to remove rocks and debris. This is why it’s also called clean fill.

Pros and Cons of Fill Sand

Thanks to the nature of sand, fill sand doesn’t retain moisture and is great for promoting drainage in areas that are likely to get wet. It’s more aesthetically pleasing than fill dirt and therefore more suitable for exposed projects. However, this material doesn’t hold its shape or remain sturdy over time, so choose where to use it carefully. Stick to using fill sand around water tanks, septic tanks, ponds, and other wet areas.

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What size gravel goes under concrete?

4. Spread a level, 2-inch layer of 3/4-minus gravel across the soil. Lay a carpenter's level on the gravel to check for levelness. Gravel pieces with irregular sides such as 3/4-minus gravel lock together better than round gravel pieces to form a solid base.

homeguides.sfgate.com - How to Pack Down Rock Before Pouring Concrete - Home Guides

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn't drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains. Gravel allows water to drain into the ground below. When packed tightly, however, the gravel doesn't shift beneath the concrete. A hand tamper is sufficient for packing gravel, but a plate compactor makes the job much easier, especially when preparing a large area such as a patio.