Page 360 - Construction Waterproofing Handbook

8.20 CHAPTER EIGHT

FIGURE 8.15 Face or bag grouting application. (Courtesy of Western Group)

JOINT GROUTING

Joint grouting is an application of cementitious grout to all surfaces of existing mortar joints.
This application is sometimes referred to as mask grouting, which is grouting walls that have
all masonry units masked (taped or otherwise covered). This protects them from grout appli-
cation on masonry unit faces. Materials used and surface preparation are the same as that for
face grouting; only applications are different.
Cementitious grout material is brushed onto joint surfaces to fill voids and cracks, while
keeping material off masonry facing. In restoration projects where joints have been tool-
recessed, grout application should fill joint recesses completely.
This application effectively points joints without requiring joint cutout. However, as
with all joint grouting systems, severely deteriorated joints should be removed and prop-
erly tuck-pointed before grout application. (See Table 8.7.)

JOINT GROUTING APPLICATION

1
If joints exist with a minor recess, 8 in or less, masonry units are masked and grout is
applied to fill joints flush with the masonry facade. Masking is removed before complete

TABLE 8.7 Joint Grouting Properties

Advantages Disadvantages
No aesthetic changes to substrate Repairs only masonry joints
Less labor intensive than other methods Adjacent surfaces should be masked
No damage to surrounding substrates Joint removal required may be overlooked