(1)
Backfill that is within 600 mm of the foundation shall be free of deleterious debris and boulders larger than 250 mm diam. (See Note A-9.12.3.3.(1))
(2)
Except as permitted in Sentence (3), backfill shall not contain pyritic material or material that is susceptible to ice lensing in concentrations that will damage the building to a degree that would adversely affect its stability or the performance of assemblies separating dissimilar environments. (See Note A-9.4.4.4.(1))
(3)
Backfill with material of any concentration that is susceptible to ice lensing is permitted where foundation walls are
(a)
cast-in-place concrete,
(b)
concrete block insulated on the exterior, or
(c)
concrete block protected from the backfill by a material that serves as a slip plane. (See Note A-9.4.4.4.(1))