248 CMR 10.11 - Plumbing Fixtures
(1)
General. Piping shall be installed with provisions,
when necessary, for expansion, contraction and/or structural settlement. Piping
shall not be supported by other piping which is connected to the plumbing
system.
(2)
Material. Hangers, anchors, and supports shall be of
metal or other material of sufficient strength to support the piping and its
contents, except where piers may be of concrete, brick, or other acceptable
material. Hangers, anchors and supports shall comply with piping and hanger
manufacturers installation instructions.
(3)
Attachment to
Building. Hangers and anchors shall be securely attached to the
building at sufficiently close intervals to support the piping and its
contents.
(4)
Intervals
of Supports.
(a)
Vertical Piping. Vertical pipe of the following
materials shall be supported at not more than the following distance intervals:
1.
Cast Iron Soil
Pipe: At base and at each story height.
2.
Threaded Pipe
(SPS): Every other story height.
3.
Copper Tubing: At
each story height but not more than ten-foot intervals.
4.
Plastic Pipe: At
each story height, but not more than ten-foot intervals and elsewhere as
required to maintain proper alignment.
5.
Stainless Steel
Tubing: At each story height, but not more than ten-foot
intervals.
6.
Aluminum
DWV: At each story height, or at intervals not exceeding ten
feet.
7.
For
Cross-linked Polyethylene (PEX) Tubing: The licensee shall consult
the individual manufacturers' installation instructions.
(b)
Horizontal
Piping. Conventional pipe clamps, brackets or strapping that have
a bearing width of three quarters of an inch or more. Horizontal pipe of the
following materials shall be supported at not more than the following distance
intervals.
1.
Cast Iron Soil
Pipe: At five-foot intervals except that where ten-foot lengths of
cast iron soil pipe are used, ten-foot intervals between supports are
acceptable.
2.
Threaded
Pipe: At 12-foot intervals.
3.
Copper Tubing (1¼
inches or less): At six-foot intervals.
4.
Copper Tubing (1½
inches or over): At ten-foot intervals.
5.
Plastic Pipe (1½ inches
or less): At three-foot intervals, (two inches or over): At
four-foot intervals.
6.
For Cross-linked Polyethylene (PEX) Tubing: The
licensee shall consult the individual manufacturers' installation
instructions.
7.
Stainless Steel Tubing (1¼ inches or less): At
six-foot intervals.
8.
Stainless Steel Tubing (1½ inches or over): At
ten-foot intervals.
9.
Aluminum DWV Pipe: At ten-foot intervals.
10.
CPVC Pipe (one inch or
less): At three-foot intervals.
11.
CPVC Pipe (m inches or
over): At four-foot intervals.
(5)
Base of Stacks.
(a) Bases of cast iron stacks shall be
supported on concrete, brick laid in cement mortar, metal brackets attached to
the building, or by other generally accepted methods.
(b) Other piping material shall be properly
supported so as not to cause any additional stress or strain at the base of the
stack.
Notes
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