This small settlement is inhabited by only two people: Sierra Petrovita, a Nuka-Cola addict, who uses her home as a place to collect Nuka-Cola merchandise and memorabilia; and Ronald Laren, the other inhabitant, who's only staying in Girdershade because of his crush on Sierra.
Girdershade consists of two houses underneath a damaged highway overpass, and has some minor barriers in place.
- A random encounter of a scavenger offering the player a Nuka-Cola Quantum will mark Girdershade on their map if it hasn't been discovered yet. The scavenger will mark it regardless if whether or not the player purchases the Quantum from him.
- After The Waters of Life is completed, an Enclave camp consisting of one Enclave officer, two Enclave soldiers, and two Enclave deathclaws will appear north of the settlement. Occasionally, an Enclave soldier will wander into the perimeter of Girdershade, but will only spawn when the player exits Ronald's or Sierra's house.
- If the player has the Quantum Chemist perk, Sierra's house is a great place to pick up Nuka-Cola.
- Taking the Nuka-Cola from Sierra's house will result in negative Karma.
- Care should be taken when fast traveling to Girdershade, as various Wasteland creatures, (such as, at higher levels, yao guai or radscorpions), have a habit of wandering into the settlement.
- Talking to Sierra and Ronald will provide the player with map markers for Evergreen Mills, the Dunwich Building, and the Nuka-Cola plant.
- Enclave sentry bots from the nearby camp may follow the player into one of the houses and may kill the resident.
Girdershade appears only in Fallout 3.