Question 1

What types of foundation issues does Fissure 640 address?

Accepted Answer

Fissure 640 addresses issues such as damp-proofing and drainage of foundations, repair of French drains, and interior and exterior foundation cracks. They also handle pyrite decontamination.

Question 2

What is the difference between active and passive foundation cracks?

Accepted Answer

Passive cracks stabilize after a few years and are typically due to initial construction issues. Active cracks grow progressively and require immediate repair to prevent further damage. They can be caused by poor drainage, waterproofing issues, ground movement, or pyrite.

Question 3

What are the signs of a defective foundation drain?

Accepted Answer

Signs of a defective foundation drain include water accumulation around the foundation, white powder (efflorescence) at the base of concrete walls, moisture streaks, mold in the basement, swelling paint on concrete, concrete decomposition, and high humidity levels in the basement.

Question 4

What methods does Fissure 640 use for crack repair?

Accepted Answer

Fissure 640 uses interior crack repair by injecting polyurethane under pressure for cracks up to 1mm wide. For cracks wider than 1mm or active cracks, they perform exterior repairs involving excavation, crack sealing with multiple products, and installation of an elastomeric membrane.

Question 5

What is pyrite and how does Fissure 640 address it?

Accepted Answer

Pyrite is iron sulfide found in crushed stone backfill. If it contains reactive rocks and moisture, it can swell and cause damage to concrete slabs. Fissure 640 offers pyrite decontamination and uses specialized backfill like 'remblai DB' which is not susceptible to pyrite swelling. They also perform tests to evaluate the pyrite's swelling potential.

Question 6

What services are offered for French drains?

Accepted Answer

Services for French drains include inspection (pre-purchase and camera), installation, repair, and replacement. They also offer specialized installations for soil with iron ochre and use appropriate backfill materials.