WETT Certified Inspection

WETT Certified Inspection

Here are some of the common problems found during a WETT Certified Inspection.  As a home owner you can check your wood burning appliance before arranging for an inspection.  This can save you time and money.   Also if you are installing your own appliance it can help you comply with the required installation and safety standards.

Hearth Extension 

Fireplaces shall have a noncombustible hearth extending not less than 400 mm (15 3/4 in) in front of inspection.com/tag/fireplace/” title=”View all articles about fireplace here”>fireplace opening measured from the facing, and not less

Barrie WETT Hearth Inspecton

Large Fireplace Hearth

Where the fire chamber floor is elevated more than 150 mm (5 7/8 in) above the hearth,the dimension of the hearth measured perpendicular to the plane of the fireplace opening shall
be increased by not less than
(a) 50 mm (2 in) for an elevation above 150 mm (5 7/8 in) and not more than 300 mm
(11 3/4 in), and
(b) an additional 25 mm (1 in) for every 50 mm in elevation above 300 mm (11 3/4 in).

When a fireplace opening is greater that 6 sq ft require a hearth that extends 20 in in front and 12 in to each side.

If the fireplace opening is less than 6 sq ft a hearth extending 16 in to the front and 8 in to each side.

Chimney Inspection

One of the most valuable items you can install on your chimney is a rain cap.  A $25.00 chimney cap will prevent water, snow and debris from entering your chimney.  Water, Masonry and Winter Freezing Cycle can do a lot of damage to your chimney and also cause some safety issues.

Modern chimney’s have to have a prefabricated or poured on site chimney cap with drip edge.  Older masonry chimney caps tend to crack and allow water to penetrate into chimney structure.  Unless you are regularly inspecting and sealing cracks in older chimney caps,  most likely there is some deterioration occurring.  Once the water penetrates the cap it starts attacking bricks, mortar and chimney flue liners.

Flue liners can become cracked or mortar deteriorated and missing.  This will require repair by a mason prior to inspection.  Many times if clay flue liners are damaged the home owner will opt for installing a stainless steel wett-inspection.com/tag/liner/” title=”View all articles about liner here”>liner.

Height of Chimney

The top flue of your chimney must be a minimum of 3 feet above roof at chimney base.   It must also be at least 2 feet above any roof feature that is within 10 feet.

WETT Chimney Height Rule

Chimney Height Rule

Weather Resistant

The outer surface of your chimney should be weather resistant.  The top of chimney cap where wett-inspection.com/tag/liner/” title=”View all articles about liner here”>liner passes through should be sealed with caulking.  Mortar joints should be shaped to shed water.  The freeze / thaw cycle can deteriorate bricks.  Masonry chimney’s need periodic maintenance to repair cracks in caps and caulking.


Inspect flashings to ensure they are tightly fitted against brick surface, for corrosion or rust.  Caulking maybe required to ensure adequate seal.  Any corroded or rusted flashings should be replaced.

Type A Chimney’s

These types of factory built chimney’s were used until the late 1970’s where it was discovered that the metal could buckle with the extreme heat of a creosote fire.  Although still in use, this  Type A chimney’s should be closely inspected for any signs or corrosion or failure.   If installing a new wood burning appliance, the Type A chimney must also be replaced.

Chimney Cleaning

Depending on how often you use your wood burning appliance should dictate how often you clean it.  Every chimney should be cleaned annually and if used as a heat source during the winter, twice or more is probably a good idea.   If your chimney has seen a lot of use then it is recommended you have it inspected by a WETT Certified Chimney Sweep as Creosote can hide cracks and missing mortar etc. Read more about Chimney Cleaning

Wood Stove

Certified Wood Stove

The very first question I ask my clients when calling for a Wood Stove inspection is; ” Is your stove Certified?”.   A Certified Wood Stove has a data plate, usually located on the back, which

Certification Label - Barrie WETT Inspections

Certification Label

indicates that unit was tested in accordance with a Listed Agency and it will display the clearances required to combustible products.  It will usually also indicate the clearance required for stove pipe, whether single wall or double.  Older stoves may also have minimum hearth pad dimensions. CSA, Underwriters Laboratory (ULC), WarnockHersey, and OMNI  Laboratories are typical Testing Agencies found on label.

Uncertified Wood Stoves

If your wood stove does not have a label indicating it was tested by one of the above agencies, then it is an uncertified wood stove.  The minimum clearance to any combustible on front , sides and rear is 48 inches.   Although clearances can be reduced by using approved shielding methods,  most home owners opt for buying a new wood stove.   The new models of wood stoves have very small clearance requirements and they are quite energy efficient  compared to older models.  EPA requirements also require cleaner burning stoves which requires less chimney cleaning and more efficient fuel burning.

Floor Protection

There are two types of required floor protection: thermal protection – protecting the floor from radiant heat from the bottom of the stove – and ember protection. For ember protection, you need to have continuous, non-combustible flooring under your appliance, extending 8” beyond it at the rear and sides and extending 18” in front of the wood loading door.


For more information on obtaining a Certified WETT Inspection of your wood burning appliance,  Call Roger at 705-795-8255



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