Lancaster County, Salisbury Township, PA. Y4-9 on the scene at 637 Gault Rd with a single family dwelling, with heavy smoke showing from the roof. Units on-scene: Air 3-9, AMB 4-9, E3-2-2, E4-4-1, E4-9-1, E4-9-2, SQD 4-4, T3-2, T4-4, T4-9. Stand-by Transfers: E4-2-2 to Station 4-9, E3-9-1 to Station 4-4. No further Information at this time.