Page 369 - Construction Waterproofing Handbook

REMEDIAL WATERPROOFING 8.29
area. If a waterproofing system is to be applied after grout injection, the entire substrate
should be cleaned and prepared as necessary.
On minor cracks, or substrate of 6-in thick or less, holes for ports are drilled directly over
cracks. In thicker substrates and large cracks, ports are drilled approximately 4–6 in away
from cracks at an angle that intersects the crack itself. Test holes should be completed

FIGURE 8.27 Chemical grout injection into large joint.
(Courtesy of Webac)

FIGURE 8.28 Repair of existing joint using chemical grout to allow for future movement. (Courtesy
of Webac)

TABLE 8.9 Chemical Grout Properties

Advantages Disadvantages
Excellent movement capability Cost
Several formulations available Requires specialized installation methods
Concrete, masonry, wood, and soil substrates Toxic chemical used