Cracking in concrete may result from a range of factors. Settlement, thermal stresses, faulty workmanship, day-to-day use of the facility and other action on the building fabric subject the waterproof barrier to a variety of loads. Cracks penetrating the entire cross-section of a building element may culminate in extensive structural or other damage. Indeed, water-bearing cracks not only attack concrete reinforcement, they may also limit or even prevent use of the premises.

It is difficult, as a rule, to determine the crack structure by simply examining the fabric surface. Cracks also change over time, thereby imposing new loads on the waterproof barrier. Apart from the effects of movement (opening and closing of cracks), crack contamination is another key issue: soiling by dirt particles, oil or other substances has to be prevented to ensure proper waterproofing performance.

RASCOR's crack injection systems focus on providing a waterproof barrier within the fabric. Additional options include grout curtains and consolidating injections, which are incorporated behind or below the structural envelope.

Key issues for reliable waterproofing solutions:

• What are the causes of cracking?
• Does the crack carry water?
• Are major shifts in the crack pattern likely?
• What is the designated use of the premises?

Various grouts are available to meet the specific requirements:

• RASCOflex (acrylic)
• RASCOpur (polyurethane)

Final thoughts
Expert counselling is essential in ensuring the correct choice of product for the particular location and providing a swift, efficient and reliable remedy for the leaking fabric. Please give us a call – we should be delighted to lend a helping hand!