What is pyrite?
Pyrite is an iron sulphide (FeS₂) found in some aggregates used as backfill under slabs. Exposed to air and moisture it can oxidize and make the backfill swell, heaving and cracking the slab.
The CTQ-M200 protocol
We inspect and core the backfill under the CTQ-M200 protocol and BNQ 2560-500 standard. The sample is analysed in an accredited lab (petrographic analysis) to establish the IPPG swelling-potential index. Determining the IPPG is reserved to an engineer, and the signed report can be used in a latent-defect claim.
FeS₂
Pyrite — 1 sample
Backfill coring under the CTQ-M200 / BNQ 2560-500 protocol, petrographic analysis in an accredited lab (IPPG), signed report.
from $550+ tax
FeS₂
Pyrite — 2 samples
When the garage and basement sit on different backfills, each one is tested separately.
from $875+ tax
Rn+FeS₂
Under-Slab package
Engineer radon diagnostic + pyrite screening: one core, two signed reports ($1,230 separately).
$980+ tax
Radon and pyrite sit in the same place, under your slab. The Under-Slab package covers both with one visit and one core. See also radon testing.