Rockford Chimney Supply: Freestanding Stove Through Flat Ceiling Measurements
If you’re installing a freestanding stove in a room with a flat ceiling, this guide will help you figure out the stove pipe and chimney pipe lengths needed! We’ve narrowed in on all of the measurements you’ll need to gather.

One more thing to keep in mind before you move on to the guide - this particular guide is for a freestanding stove being installed in an area without a chimney which will need to pass through a flat ceiling.
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A1: What fuel is the stove burning? (wood, pellet, gas, etc.)
A2: Is the exhaust outlet on the top or the back of the stove?
A3:  What is the inside measurement of the exhaust hole?
A4: Are you planning on installing single wall black stove pipe (18” clearance to combustibles) or double wall black stove pipe (6” clearance to combustible walls / 8” clearance to combustible ceilings)
B1: What is the height from the exhaust hole to the flat ceiling?
B2: Are any offsets (elbows) needed in order to reach the ceiling? We offer 45 and 90 degree offset elbows.
B3: If you do need to offset the pipe from the ceiling penetration, what is the offset measurement from the center of the exhaust hole to the center point of the ceiling penetration?
C1: What is the thickness of the ceiling joist? (Distance from the bottom of the ceiling to the top of the ceiling joist on the next level of the home or in the attic)
C2: Is there an occupied living space above the flat ceiling? If so, what is the measurement from the floor to the next ceiling?  (Skip this question if there is no living space above the first floor where the wood stove is located)
C3: Is there an attic space above the flat ceiling? If so, what is the measurement from the top of the ceiling joist in the attic to the bottom of the roof deck?
C4: Is there an offset needed for the pipe above the first ceiling penetration? If so, what is the measurement from the center point of the first ceiling penetration to the center point of the next ceiling or roof penetration? (Skip this step if the pipe is going straight up)
D1: What material is covering the roof (shingle, metal, etc.)?
D2: What is the roof pitch?
D3:  What is the lateral distance from the point where the pipe is going to pass through the roof to the peak of the roof? This measurement along with the roof pitch is going to dictate the height required for the pipe to be above the roof.
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E1: Every installation is different and nothing is standard in the chimney world! Please provide any additional information about your setup here if needed.
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