Can I rearrange or add more fire glass or lava rock in my gas fire pit?
You can rearrange it, but do it carefully and don't bury the burner — the media has to let gas flow freely and stay clear of the burner ports and any pilot or ignition. Adding more is fine up to the manufacturer's fill line; piling it too deep can trap gas, cause delayed ignition "poofs," or smother the flame. Use only rated fire glass or lava rock, never regular rock.
Keep the burner breathing
Fire glass and lava rock do two jobs — they look good and they spread the flame across the pan — but the non-negotiable rule is that gas has to flow up through them freely. When you rearrange, never cover the burner ports or bury the pilot and ignitor, and keep the media to the depth your manufacturer specifies, usually an inch or two, or up to a marked fill line. Pile it too deep or pack it too tight and gas can pool underneath, then light all at once in a startling little "whoomp," or fail to light at all. Spread it too unevenly and the flame will favor one side of the pan. Even, at the right depth, clear of the burner — that's the whole trick.
Use only rated media — this is a safety issue
This part isn't about looks. Fire glass and lava rock sold for gas appliances are washed, dried, and heat-rated to take the temperature. Never substitute river rocks, pea gravel, decorative pebbles, or found stones from the yard — porous stones trap moisture inside, and when that water flashes to steam over a burner it can pop or explode, throwing hot shards. The same goes for glass that isn't specifically rated for fire. Lava rock holds a little moisture too, so after rain let it dry before you relight — one more reason to keep the pit covered between uses. Replace lava rock once it starts crumbling to dust.
When it's DIY and when it's ours
Topping up or rearranging the media on a working pit is homeowner-friendly — as long as you shut the gas fully off first and don't disturb the burner, the ignitor, the pilot, or any gas connection. Where it stops being DIY: if you swap media types and the flame comes back yellow, sooty, or sputtering, or anything on the gas side gets touched, that's licensed gas work and it's ours. Never lean over the pit and light it to "test" a change. If the flame looks wrong or you're moving a pit between natural gas and propane, call us — [gas fire pit](/services/gas-fire-pit-installation) burner and fuel work is exactly what we do. Call (828) 545-0525.
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