Page 355 - Construction Waterproofing Handbook

REMEDIAL WATERPROOFING 8.15
TABLE 8.4 Poultice Cleaning Properties

Advantages Disadvantages
Removes deeply penetrated pollutants Requires extensive technological knowledge
No damage to substrate May force pollutants deeper
Excellent for natural stone substrate Extensive testing required before application

Complete and thorough cleaning of substrates is necessary before proceeding with the
restoration phase.

RESTORATION WORK

Just as remedial waterproofing systems must be applied over clean substrates, so too they
must be applied over sound substrates. After cleaning, all restoration work must be com-
pleted before waterproofing material is applied. Any substrate deterioration that has
occurred, including spalled concrete, damaged structural components, and oxidized rein-
forcement steel, should be prepared.
Restoration work often requires removal of building envelope portions to repair struc-
tural deterioration. This includes anchoring devices, pinning, and shelf angles used for
attaching facing materials to structural building components.
This repair work is necessary after years of water infiltration high in chloride content,
which corrodes metal components. Other required repairs, including control or expansion
joint installation and cleaning of weep holes, also are completed at this time.
After completing all necessary repairs and substrate preparation, remedial waterproof-
ing systems installation can begin (Fig. 8.12). Preventative waterproofing materials, dis-
cussed in Chaps. 2 and 3, can be applied as remedial treatments if the surfaces are properly
prepared. Remedial treatments also include installation of flashing, sealants, and other
envelope transitional materials found inadequate in the original construction.
In addition to preventative waterproofing systems, several waterproofing materials and
systems are manufactured specifically for remedial and restoration projects. In some cases
even before a building is completed remedial products are required, to repair damage
occurring during construction.
Remedial waterproofing systems now available include:
● Tuck-pointing
● Face grouting
● Joint striking
● Mass grouting
● Grout injection
● Epoxy injection
● Cementitious patching
● Shotcrete and gunite