3.2.1
Shielding
Sheet lead less than 3 mm 1/8 inch thick shall be applied in a single layer
with a 38 mm 1-1/2 inch minimum lap at joints. Sheet lead more than 3 mm
1/8 inch thick shall be applied in two or more layers 3 mm 1/8 inch or less
in thickness with 38 mm 1-1/2 inch minimum lap at joints or shall be
applied in a single layer with joints butted and covered with lead strips
not less than the thickness required for floor lining and as detailed.
3.2.2
Protection from Damage
Apply a coat of asphalt paint to the top surface of the sheet lead prior to
application of concrete surfacing. Traffic or other work will not be
permitted in the area until concrete is applied over lining.
3.3
LEAD-LINED BLOCKS
Lead-lined blocks shall be laid in running bond courses with staggered
vertical joints. Blocks designed for lead laps at joints shall be erected
to provide minimum 25 mm 1 inch tight lead laps without soldering or
burning or provide lead bars in vertical and horizontal joints. Blocks
designed to have lead bars in joints shall be erected to permit lead bars
with a thickness not less than the lead sheet thickness in block to be
inserted in horizontal and vertical joints.
3.3.1
Joints
Mortar joints shall be 9 mm 3/8 inch thick and shall be filled solid with
Type N mortar as specified under Section 04200 MASONRY. Mortar between
lead laps will not be permitted.
3.3.2
Blocks
Blocks shall extend into frame openings, with lead projecting into rabbets
of frames to effectively lap with lead frames of frame linings. Voids
around frames shall be filled with mortar.
3.3.3
Pipe and Conduit Chases
Where pipe and conduit chases occur within the blocks, concrete may be
removed from one side of the partition as required to permit pipe
installation. Where necessary to remove lead lining for pipe or conduit
installations, continuous sheet lead shall be installed and overlapped on
the adjoining construction. Voids around pipe and conduit chases within
the blocks shall be filled with mortar. Voids shall be finished flush with
the face of partition. Pipe and conduit chases shall not be installed
directly opposite each other within the same partition.
3.4
LEAD-LINED PANELS
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NOTE: When the finish of the panels must match the
finish of other woodwork, the polish sanding for
finish on the job will be specified. Length and
width of panels and joint pattern will be indicated
on the drawings and will be selected to keep weights
of panels to reasonable minimums.
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SECTION 13090
Page 14
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