Thimble Chimney - PDF Templates

Location of appliance?

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Picture of appliance:

What is the fuel type of the appliance?

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Appliance Information

Brand of appliance

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Model of appliance

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Collar size

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Nozzle size

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Efficiency

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Your appliance should be inspected and serviced annually by a qualified technician. It is standard practice to leave a service tag/report for this service so it can be referred to. We strongly recommend having the appliance serviced annually to improve efficiency, durability and longevity of the appliance.

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When evaluating the safety of a wood-burning appliance, it is compared to the appliance’s condition when new. When an appliance is damaged, (i.e., cracked or warped) it could potentially lead to unsafe conditions.

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Picture of damage to appliance:

Your appliance has been listed and tested to determine how close in proximity it can be to combustible material. The manufacturer will give a list of minimum clearances (usually located in the manual and on the back of the appliance) between your appliance and surrounding combustible material (i.e., wood, sheet rock).

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Picture of clearance concerns:

A hearth is a noncombustible platform that your appliance sits on and should extend a certain distance to the front, sides, and back of the appliance. Hearth sizing and material requirements are different for every appliance.

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Current hearth dimensions:

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Picture of hearth concerns:

A connector pipe, commonly called "stove pipe", vents the gases from the appliance into the chimney. The connector pipe should be made of the correct material and gauge based on the type of appliance it is venting; have the correct "rise" and “run” to keep the gases moving in an upward flow; and be secured with 3 screws at every joint for proper stability.

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Picture of connector pipe concerns:

The required clearances between your connector pipe and surrounding combustible material are determined by the National Fire Protection Agency.

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Picture of clearance to combustibles concern:

A wall pass-through is the area where your thimble passes through a combustible wall and enters the chimney. At this point, there is a greater potential of high heat that can potentially transfer through the masonry to surrounding combustible material. According to the National Fire Protection Agency, when a masonry wall pass-through is constructed, there must be a minimum of 12 inches of solid masonry on all sides of the masonry thimble in the wall.

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Picture of wall pass-through concerns:

What is the depth of the thimble?

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The intended purpose of chimney liner or flue is twofold. The first is to vent and contain the products of combustion. The second is to reduce the heat transfer from smoke and gases to the chimney and adjacent combustible materials surrounding the chimney structure. A chimney liner should be of appropriate material, size, and shape for the appliance it is intended to vent. Your chimney liner material is:

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Unlined Flue Details

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Picture of unlined flue:

Stainless steel chimney liners are popular in modern construction and are often used to upgrade and repair existing chimneys. They come in different shapes and alloys.

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Clay flue liners are made from a vitreous clay material designed for this application. Looking at your chimney from outside, you may notice the reddish/orange or beige flue liner protruding out of the top of your chimney. The tiles used to construct the flue are usually constructed of 2-foot tall (tube-like) sections varying in size (depth and width), with the opening determined by the appliance they are to vent. These tiles are designed to rest on top of each other. A small band of refractory cement known as a "mortar joint" is used to bond the tiles together to create the flue liner as it ascends to the top of the chimney.

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Picture of concerns with clay tile liner:

Cast-in-place chimney liners are installed by pumping a concrete-like material around a former, which is inserted down the full length of the chimney. After the lining sets, the former is removed, giving you a smooth, seamless, and extremely well-insulated chimney liner.

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Picture of concerns with cast-in-place liner:

Picture of concerns with stainless steel liner:

Clean-out doors are small access doors usually located at the bottom of the chimney. Clean-out doors allow a place to remove debris that has fallen down the chimney.

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Picture of concerns with clean-out area:

Picture of open thimble:

A thimble is a hole that was built into the chimney where another appliance is or was connected. When a thimble is not used anymore, it should be sealed with masonry.

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When constructing a chimney with a 4-inch (thickness) of masonry and a tile liner, 2 inches of air space should be allowed between the interior chimney and combustible material surrounding it (1-inch allowance for an exterior chimney).

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Picture of area surrounding chimney:

Were details on the chimney above the roof explained in another report?

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Material used above the roof-line:

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During the inspection was the roof accessed?

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Condition of masonry above the roof line:

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Photo of concerns with the masonry above the roof line:

The purpose of the chimney crown (the area surrounding the opening of the chimney at the top) is to prevent moisture or rain from entering the chimney. Left unchecked, this will allow water to enter the chimney, which causes staining and/or deterioration to the chimney.

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Photo of the chimney crown/wash concerns:

A Wythe wall is a 4-inch thick brick wall inside the chimney that separates one flue from another. This wall prevents damage from spreading from one flue to another during a chimney fire, lightning strike, or when one flue is being relined.

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Photo of distance between flues:

Are there additional flues in the chimney/chase?

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Please list the additional flues in the chimney/chase:

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Chimney flashing is a term commonly used to describe pieces of sheet metal or like material used to prevent water from entering the house at intersections such as where a roof meets a wall or a chimney.

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Photo of the cricket/flashing area:

According to NFPA211 Codes and Standards, the chimney must meet the 3’-2’-10’ rule. This means that the chimney should extend a minimum of 3 feet out of the roof or 2 feet higher than anything within 10 feet (i.e., parapet walls, dormers, or other sections of roof).

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Please list (in inches) approximately how short of code height the chimney is:

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Photo of the chimney height concerns:

A chimney cap is designed to keep moisture (i.e., water and snow) and animals out of the chimney system. In some cases it is an integral part of the chimney system and can affect draft.

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Photo of the chimney cap concerns:

Winters in the northeast can create large ice dams and snow loads. A chimney located far down from the ridge of the roof can be susceptible to damage from snow and ice.

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Picture of concern with snow load

Were accurate measurements of the flue and chimney taken above the roof line?

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Rooftop measurements

Chimney ID

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Chimney OD

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Chimney height above roof line (higher side)

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Brick/Block Measurements

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Crown Measurements

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Flue measurements

Flue ID

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Flue OD

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Flue Length

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Report Conclusions

A chimney fire refers to the presence of actual combustion within some part of a venting system. Although usually applied mainly to the chimney flue, this usage also includes combustion in chimney connectors and thimbles and the smoke chambers of fireplaces.

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Photo of the damage caused by a chimney fire:

Suitability of System for Continued Use

This inspection report is designed to inform you about your chimney system so that you can make educated decisions on continued usage, possible upcoming repairs, and the longevity of the system. Please understand that chimney construction in Vermont and New Hampshire goes unregulated, and in the majority of chimneys that we inspect we find some kind of code violation or issue with the construction/installation. We are left on a daily basis to make a judgment call on the safety of these systems and therefore your homes. We have decided to point out all safety concerns so that you can be made aware. However, some code violations and safety issues may be more serious than others. We encourage you to give us a call to have a discussion about the issues found in this inspection report.

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