Materials Explained

Polymeric sand locks paver joints solid against weeds and ants — until it hazes, washes out, or cracks. Here is how activation actually works and the mistakes that cause every common failure.

There is no single right depth for gravel — there are about six, one for each kind of project. Here is the depth chart, plus why depth quietly drives your bill more than area does.

Riprap is sized to the water it has to survive, not to taste. Here is how R-3 through R-5 classes work, how to size for shorelines, swales, and culverts, and why fabric underneath matters more than the stone itself.

Length times width times depth, all in feet, divided by 27. That is the whole formula — here is how to run it on real yards, odd shapes and inch-deep layers without tripping over the units.

Four inches of compacted crusher run is the floor for a foot-traffic patio, not the target. Here is how deep to go by use, soil and frost depth, plus the excavation math.

Sand is not one product. Grain shape and washing determine whether it holds a patio flat or lets it sink. Here is every common type, what it costs, and which one your job actually needs.

The most-specified aggregate in North America, explained: what the number means, the 36-42% void space that makes it drain, and why it can never serve as a compacted structural base.

Crusher run goes by a different name in almost every region — crush and run, #411, 2A modified, DGA. Here is what the product actually is, why the fines matter, and how to order it under the right name.