Chimneys Too Short - What is "too short" and What Problems Occur?Ī chimney that is too short is unlikely to vent properly and it may also be a serious fire hazard to the building, risking setting the roof on fire. More chimney and flue clearance and distance articles are given at the ARTICLE INDEX at the end of this article. The chimney is single wythe or thicker masonry and whether or not the chimney has That's the light blue line in our photo.Ĭheck the chimney top for damaged masonry (or rusted metal), a missing cap,ĭamaged, cracked, or missing top seal or crown on the top of a masonry flue,Īnd here, an important discovery (at least in some jurisdictions) is whether or not Touch the roof surface to check the ten-foot clearance rule distance.
Measure from the edge of the chimney flue closest to the roof, horizontally, until you This measuring tape location shown in this photo is slightly incorrect (I didn't want to lose my tape down the flue while taking the picture).
But the chimney-to-roof clearance rules still apply. This is a bit of an odd measurement and chimney clearance case because the chimney side is actually about 8" away from the roof edge. The height of the chimney above the roof surface, measured at the up-slope side of the chimney, from the roof surface to the chimney top, should be at least three feet - the green line in our photo. Detailed specifications for chimney vertical and horizontal chimney clearances are given below. this chimney top is too close to the roof surface (the horizontal blue line) and too short as well (the vertical green arrow). In our photo, our measuring tape is pulled to about 4 1/2 Ft. And the top of the chimney flue must be at least 2 ft. The roof surface should be ten feet or more (the blue line in our photo). Horizontal line drawn from the top of the opening of the chimney flue to the point at which that line touches Outdoor Chimney Height & Clearance RequirementsĬhimney to Roof Clearance: from the ground you can guess and from on-roofĪccess you can measure to determine if a chimney is simply too short for fire safety We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
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These articles on chimneys and chimney safety provide detailed suggestions describing how to perform a thorough visual inspection of chimneys as well as chimney construction & repair methods.Ī variation on a "too short" metal or masonry chimney is a chimney that may look tall-enough to some folks but which lacks adequate clearance from a nearby roof slope, as we illustrate and explain in the text below. We describe what can go wrong with chimneys that are not built to proper height or with proper clearances from other building features, including improper or unsafe heating appliance or fireplace or woodstove operation, odors, soot, draft issues, etc. This article describes the height requirements for chimneys, including rooftop clearances and overall chimney height necessary for proper chimney draft and function and for fire safety. We have no relationship with advertisers, products, or services discussed at this website.Ĭhimney / vent height & horizontal clearance specifications: InspectAPedia tolerates no conflicts of interest.
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