WETT Inspection Notes

 Site Basic Wett Inspection Barrie

(Notes of interest from recent Site Basic Course)


Wood Appliance Performance

Our WETT Instructor was quite emphatic about ensuring we did not include any performance issues as part of our WETT  Certified Inspection.  As he pointed out that a wood burning appliance could be installed in accordance with manufactures instructions, B-365 and the Ontario Building Code and still not work properly.

WETT Certified  Chimney Sweeps can offer advice on running your wood burning appliance efficiently.  Also Level 2 and 3 WETT Certified inspectors can evaluate and suggest better burning habits and equipment operation.

Most retailers and manufactures would be able to supply advice on the products that they sell.  Many have support available online.

Ceiling Clearance

You always have to follow the manufactures installation requirements, but if there is no dimension for stove top to ceiling you can follow ULC S-627.  This simply states that the required distance from floor to ceiling minimum height is 82 inches for any Certified Wood Stove.

If your appliance had dimensions for Alcove Installation you can use those dimensions for a regular installation as Alcove Installation is more restrictive.

Ember Pad

Most ember pads have to extend to sides and rear by 8 inches.  When installing a wood stove in a corner you would would only have to extend the ember pad to the wall.   So if you only had 3 inches of ember pad in this area you would still be compliant with requirements.

Flue Pipe Installation

Your flue pipe is not part of your wood stove.  Flue pipes have their own Certification Label and must be installed in accordance with the manufactures installation instructions.  If you are offsetting your flue pipe from ceiling support you would have to provide 18 inches clearance for an uncertified wood stove or for a certified wood stove it would have to be installed as per label or manufactures instructions.  Certified Flue Pipes conform to ULC S-641.

Length of Flue Pipe

First to properly measure a flue pipe you follow the lateral line for measurement.  CSA B-365 requires that an uncertified flue pipe not exceed 10 feet in length including the elbows.  Certified Flue Pipes must meet manufactures installation requirements.  According to CSA B-365 you are only allowed of maximum of 2 – 90 degree elbows to be installed.  Free standing stove flue pipe has to conform to S-629 (650 deg) or ULC S-610

Although your flue pipe have to be from the same manufacturer you do not have to use the same manufacturer for your chimney connector.

Breech Pipe Inspection

The Breech Pipe Connection is typically not covered in a Site Basic (level one) inspection.  When mortared into place and you suspect an issue then you would recommend a Level Three inspection.  Most Site Basic WETT Inspectors  will check off Unable to Inspect box on inspection report form.

Masonry Fireplaces

Many people and masonry contractors are not aware that the Heat Circulating Duct Outlets on the front of fireplaces must conform to the Ontario Building Code .  Depending on the projection from face of fireplace will determine the required clearance.  ie: when projection is less than 38 mm a clearance of 150 mm is required.


These units are covered by ULC S610 and the manufactures installation instructions.  Factory-built fireplaces are built in such a way that they can typically be installed just inches away from combustible materials.  Most are constructed of metal and have glass doors, insulated walls, air-cooled pipes, and blowers which can move the heat produced by the fire into the room.  The chimneys which come with the factory-built fireplaces are especially constructed to work safely and most efficiently with the heating unit.  It’s extremely dangerous ( and illegal ) to use a chimney which doesn’t meet the specifications outlined by the manufacturer.



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