Chimneys And Flues

chimney maintenance

Chimneys in Massachusetts come in a variety of styles, consisting of numerous interrelated components. However, they generally fall into three main categories: single-walled metal chimneys, masonry chimneys, and pre-fabricated metal chimneys, often referred to as factory-built chimneys. While single-walled metal chimneys are uncommon in residential settings, masonry (both lined and unlined) and factory-built chimneys are frequently encountered.

My chimney inspection is conducted as a Generalist, not a Specialist, and adheres to all industry standards. However, it’s important to note that significant areas of chimney flues are not fully visible during a standard field inspection. As the Chimney Safety Institute of America stated in 1992, "The inner reaches of a flue are relatively inaccessible, and it should not be expected that the distant oblique view from the top or bottom is adequate to fully document damage even with a strong light".

Since my inspection is limited to visible areas without dismantling any components or using specialized equipment, I cannot guarantee the chimney’s integrity. Therefore, I recommend having all chimneys professionally video-scanned for deterioration, damage, or missing liners before the close of escrow.

CHIMNEY FLUES

Chimney flues require periodic cleaning to reduce the risk of a chimney fire. However, the deposits that accumulate within flues as a result of incomplete combustion are complex and not easily understood. These deposits range from soot, which is pure carbon and non-combustible, to creosote tars that can ignite easily. While all these substances are often referred to as creosote, they vary in form — from loose, crusty carbon deposits that can be brushed away, to hardened, tar-glazed creosote that demands professional chemical cleaning. Proper identification and treatment of these deposits should be handled by a qualified chimney specialist.

It is important to note that even a thorough chimney cleaning does not eliminate the risk of a chimney fire. Studies have shown that a significant number of chimney fires occur within a month of cleaning, with many more occurring within six months.

At Massachusetts Home Inspections, it is impossible to determine with certainty whether flues are entirely free of defects during a standard inspection. In accordance with the National Fire Prevention Association's recommendations, I advise all home buyers to have chimneys professionally inspected before purchasing a home. Consider hiring a CSIA-certified or equivalently certified chimney sweep to perform a Level II inspection of all chimney flues before the close of escrow.

UNLINED CHIMNEY IN NEED OF AN APPROVED LINER

unlined chimney

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Dave,

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