Lateral support for masonry chimneys

Heating · Masonry Chimneys · printed page 163 (PDF page 164)

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Book index entries

Lateral Support Lateral Support – for Masonry Chimneys

Text in the illustration

laterally unsupported portion of chimney
wood frame house
masonry or masonry veneer house
A
since lateral support is required every 12 feet, most chimneys in wood frame houses over 1 story high will require additional bracing (often at each floor level and or the attic)
you won't be able to see if this bracing has been provided, but you may be able to see the results of missing bracing
B
unless the chimney is very tall, additional bracing probably won't be required
tall chimneys are typically tied back to the roof with metal braces

Generated explanation

Two house elevations compare lateral support conditions for exterior masonry chimneys on a wood frame house and a masonry or masonry veneer house. On the wood frame house, a dimension arrow identifies the laterally unsupported chimney length from the top of the foundation to the chimney top. On the masonry or masonry veneer house, the unsupported length is marked only above the eave. Notes state that lateral support is required every 12 feet and that wood frame houses over one story generally require additional chimney bracing, which may be concealed. The masonry-house notes explain that additional bracing is generally unnecessary unless the chimney is very tall, and that tall chimneys are typically tied back to the roof with metal braces; the braces themselves are not illustrated.

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