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0975 Chimney Leaning Above Roof Line - Heating - Masonry Chimneys
 
0975 Chimney Leaning Above Roof Line - Heating - Masonry Chimneys -

Image Text: Cross section > chimney lean above the roof line is most likely to be a problem in northern climates and on tall, unlined chimneys venting an oil-fired appliance > the sulphur in the exhaust gases from oil burners combines with water when it condenses to form sulphuric acid that deteriorates the mortar > the mortar is then more prone to swelling due to moisture from wind-driven rains > when the chimney is tall, the effects are more pronounced > direction of wind-driven rains > mortar on this side of the chimney swells > plumb bob > roof rafter > attic > ceiling joist > wall

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