How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

What is the 3-2-10 rule for masonry chimneys?

Saturday, June 30, 2018

It’s a basic standard for chimney construction which states that the chimney should extend 3 feet above the roof penetration on the shortest side, and the top of the chimney must be at least 2 feet above any part of the house structure within 10 feet. 

    The rule is intended to make sure the chimney is tall enough so that any nearby parts of the structure will not interfere with the necessary draft to exhaust combustion gases. While this is a good basic standard, following the 3-2-10 rule does not guarantee that a chimney will not have downdraft problems.

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    Here’s links to a collection of our other blog posts about FIREPLACES AND CHIMNEYS: 

What causes black soot buildup on my gas fireplace logs? Why is creosote buildup in a chimney dangerous? 

Why does the house have a chimney but no fireplace?

Why is the chimney leaning away from the house? 

How is a factory-built fireplace different from a regular fireplace?

• The fireplace doesn't have a chimney. Is that alright? 

    Visit our FIREPLACES AND CHIMNEYS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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