How to install a flagstone path Use our easy step-by-step instructions to install your own path in a weekend Step 1 Install benderboard edging first, then put down landscape fabric (available at nurseries) to prevent weeds. Secure fabric edges under the benderboard edging. Pinterest Step 2 Pour a 2-inch-thick layer of sand over the landscape fabric, raking it smooth. (In rainy areas, put down a 2-inch gravel layer first.) Step 3 As you rake, moisten the sand with a fine spray from the hose. Step 4 Firm the sand. Using a drum roller or a hand tamper, pass over the moist sand several times to pack it down. Step 5 Add steppingstones, then wiggle them in so they're firmly embedded. Step 6 To finish, fill cracks between stones with gravel, or ― to hold flagstones more firmly ― use something smaller like decomposed granite.