Inspection of pyrite: knowing how to detect it before suffering the nightmare
Here is a bit of history to get to know pyrite better… The one we call madman’s gold. Let us first consider how the Régie du Bâtiment du Québec describes it: ” Pyrite is a mineral found in stone and which produces sulfuric acid by oxidizing on contact with humidity and oxygen. When this phenomenon occurs below a foundation, it can cause heaving and cracking of the concrete slab . “
Pyrite made its appearance in the 1980s, although it was found in certain constructions of the 1970s. However, it was only after ten years that the damage caused by pyrite became apparent or at least detectable. In Quebec, the discovery of pyrite following building inspections, made it possible to target regions where the presence of pyrite is more frequent. (see further down in this page).
Since 1999, builders have voluntarily applied the CTQ-M100 standard to exclude stone from embankments at risk of pyrite.
Pyrite inspection recommended by real estate agents
How pyrite acts on structures
-Between 21 and 40, low to medium
-From 41 to 60, medium to high
-From 61 to 80, high
-From 81 to 100, extremely high
-South Shore of Montreal
-North Shore of Montreal
-East and West ends of the city of Montreal
In the greater metropolitan area, 91 cities that were identified as having buildings with a pyrite problem . More recently, the Montérégie sector has shown many cases, particularly in the following municipalities:
Pyrite tests carried out in the laboratory
By choosing to proceed with a home inspector, you also ensure that you can have a more complete picture of the impact of the presence of pyrite on the entire property or building.
Purchase of property and presence of pyrite
- that you have a duty to educate any buyer about pyrite, even if the property does not appear to be affected;
- that he must, when required in residential matters, complete the mandatory Declarations by the seller of the immovable form , indicating whether or not he is aware of the presence of pyrite;
- that an expert assessment should be carried out quickly to determine whether pyrite is causing or could cause problems;
- that a buyer usually does not assume the cost of an expertise and that he cannot do so without the authorization of the owner;
- that if a problem is found, it must be corrected, or the sale price must reflect that problem. Otherwise, the building could be difficult to sell;
- that a copy of the expert’s report (and, if applicable, the detailed invoice for the repairs carried out) must be sent to any buyer, regardless of the result of the analysis.