N.H. Admin. Code § Inst 603.03 - Design Requirements Including Load-Bearing Capacity
(a) The
load a pier can carry shall depend on the house, roof live load, spacing of the
piers and the way piers are used to support the house.
(b) Pier concrete blocks shall be stacked
with their hollow cells aligned vertically.
(c) Piers constructed of blocks stacked side
by side shall be at right angles to the preceding course.
(d) Piers shall be:
(1) Concrete blocks which have a nominal
dimension of at least 8 in. x 8 in. x 16 in.; or
(2) Adjustable metal or concrete
piers.
(e) Manufactured
adjustable metal piers shall be labeled for load capacity.
(f) Caps shall be used to cap the hollow
concrete blocks. All caps shall be of the same length and width as the rest of
the piers on which they rest. The caps shall be of solid masonry of at least 4
inches thickness or wood of at least 2 inches of nominal thickness or 1/2
inchsteel on piers of less than 36 inches height.
(g) Piers less than 36 inches high may be
constructed of single, open and closed cell concrete blocks.
(h) Piers between 36 inches and 67 inches
high and all corner piers over 3 blocks high shall be constructed out of double
interlocking blocks.
(i) Piers over
67 inches high shall be designed by a licensed New Hampshire professional
engineer or architect.
(j) Mortar
shall not berequired for concrete block piers, unless required by the
manufacturer installation instructions or design.
(k) No caps shall be needed for piers using
solid blocks.
Notes
#8494, eff 12-24-05; ss by #10155, eff 4-14-12
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