3.2.7
Jointing
Joints shall be tooled when the mortar is thumbprint hard. Horizontal
joints shall be tooled last. Joints shall be brushed to remove all loose
and excess mortar. Mortar joints shall be finished as follows:
3.2.7.1
Flush Joints
Joints in concealed masonry surfaces and joints at electrical outlet boxes
in wet areas shall be flush cut. Flush cut joints shall be made by cutting
off the mortar flush with the face of the wall. Joints in unparged masonry
walls below grade shall be pointed tight. Flush joints for architectural
units, such as fluted units, shall completely fill both the head and bed
joints.
3.2.7.2
Tooled Joints
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NOTE: Joints in exterior masonry walls exposed to
weather will be tooled with an approved mortar
joint, typically a slightly concave joint. Other
joints that are suitable for weathertight
construction and may be considered for architectural
purposes are: Vee, Beaded, or Weathered types.
Exposed to view or painted interior masonry walls
will also be tooled, typically with a slightly
concaved joint, but may also be tooled with other
joint types as architecturally desired.
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Joints in exposed exterior and interior masonry surfaces shall be tooled
[slightly concave] [_____]. Joints shall be tooled with a jointer slightly
larger than the joint width so that complete contact is made along the
edges of the unit. Tooling shall be performed so that the mortar is
compressed and the joint surface is sealed. Jointer of sufficient length
shall be used to obtain a straight and true mortar joint.
3.2.7.3
Door and Window Frame Joints
On the exposed interior side of exterior frames,
joints between frames and
abutting masonry walls shall be raked to a depth
of 10 mm 3/8 inch. On the
exterior side of exterior frames, joints between
frames and abutting
masonry walls shall be raked to a depth of 10 mm
3/8 inch.
3.2.8
Joint Widths
Joint widths shall be as follows:
3.2.8.1
Concrete Masonry Units
Concrete masonry units shall have 10 mm 3/8 inch joints, except for
prefaced concrete masonry units.
3.2.8.2
Prefaced Concrete Masonry Units
Prefaced concrete masonry units shall have a joint width of 10 mm 3/8 inch
wide on unfaced side and not less than 5 mm 3/16 inch nor more than 6 mm
1/4 inch wide on prefaced side.
SECTION 04200
Page 46
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