At 1251 ETFD was dispatched to 1652 Fallen Timber Rd. for a shed on fire endangering the residence.  AC3 arrived on scene and reported a fully envolved shed fire that extended to the to woods.  Eng 3 onscene and pulled the front trash line and was able to get a good knock down on the fire.  Eng 354 (WM11) arrived on scene and assisted with manpower.  All other units were returned back in service.  Allegheny County Fire Marshall requested to the scene.  Fire Marshall concluded his investigation and all units cleared. Units on scene: 140 E3, E354, 520  Responding units:  E2, E7 and R4