Waterproofing: "class I4
Pathology of dampness. Coated walls in the building sector

If the hydraulic rendering is the site of existing or future cracks, the opening of which is less than 20/10th of a millimeter, "I4" waterproofing will be a solution for masking these cracks.

This "flexible film" capability lies in the system's formulation, which includes a plasticizer additive to give it a certain residual elasticity once the resin has polymerized.

It should be noted that NF P 84-402 recommends a performance class ranging from I1 to I4, depending on crack opening (cf. § 9.2.1.2.1 of