Page 150 - 2018_IRC

FOUNDATIONS

R404.1.3.3.2 Concrete mixing and delivery. Mix- R404.1.3.3.6.1 Stay-in-place forms. Stay-in-
ing and delivery of concrete shall comply with place concrete forms shall comply with this sec-
ASTM C94 or ASTM C685. tion.
R404.1.3.3.3 Maximum aggregate size. The nomi- 1. Surface burning characteristics. The flame-
nal maximum size of coarse aggregate shall not spread index and smoke-developed index
exceed one-fifth the narrowest distance between of forming material, other than foam plas-
sides of forms, or three-fourths the clear spacing tic, left exposed on the interior shall com-
between reinforcing bars or between a bar and the ply with Section R302. The surface burning
side of the form. characteristics of foam plastic used in insu-
lating concrete forms shall comply with
Exception: Where approved, these limitations Section R316.3.
shall not apply where removable forms are used
and workability and methods of consolidation 2. Interior covering. Stay-in-place forms con-
permit concrete to be placed without honeycombs structed of rigid foam plastic shall be pro-
or voids. tected on the interior of the building as
required by Section R316. Where gypsum
R404.1.3.3.4 Proportioning and slump of con- board is used to protect the foam plastic, it
crete. Proportions of materials for concrete shall be shall be installed with a mechanical fasten-
established to provide workability and consistency ing system. Use of adhesives in addition to
to permit concrete to be worked readily into forms mechanical fasteners is permitted.
and around reinforcement under conditions of place-
ment to be employed, without segregation or exces- 3. Exterior wall covering. Stay-in-place forms
sive bleeding. Slump of concrete placed in constructed of rigid foam plastics shall be
removable forms shall not exceed 6 inches (152 protected from sunlight and physical dam-
mm). age by the application of an approved exte-
rior wall covering complying with this
Exception: Where approved, the slump is per- code. Exterior surfaces of other stay-in-
mitted to exceed 6 inches (152 mm) for concrete place forming systems shall be protected in
mixtures that are resistant to segregation, and are accordance with this code.
in accordance with the form manufacturer’s rec-
ommendations. 4. Termite protection. In areas where the
probability of termite infestation is “very
Slump of concrete placed in stay-in-place forms heavy” as indicated by Table R301.2(1) or
shall exceed 6 inches (152 mm). Slump of concrete Figure R301.2(7), foam plastic insulation
shall be determined in accordance with ASTM shall be permitted below grade on founda-
C143. tion walls in accordance with Section
R404.1.3.3.5 Consolidation of concrete. Concrete R318.4.
shall be consolidated by suitable means during 5. Flat ICF wall system forms shall conform
placement and shall be worked around embedded to ASTM E2634.
items and reinforcement and into corners of forms.
Where stay-in-place forms are used, concrete shall R404.1.3.3.7 Reinforcement.
be consolidated by internal vibration. R404.1.3.3.7.1 Steel reinforcement. Steel rein-
forcement shall comply with the requirements of
Exception: Where approved for concrete to be
placed in stay-in-place forms, self-consolidating ASTM A615, A706, or A996. ASTM A996 bars
concrete mixtures with slumps equal to or greater produced from rail steel shall be Type R. In
than 8 inches (203 mm) that are specifically buildings assigned to Seismic Design Category
designed for placement without internal vibration A, B or C, the minimum yield strength of rein-
need not be internally vibrated. forcing steel shall be 40,000 psi (Grade 40) (276
MPa). In buildings assigned to Seismic Design
R404.1.3.3.6 Form materials and form ties. Forms Category D , D or D , reinforcing steel shall
2
0
1
shall be made of wood, steel, aluminum, plastic, a comply with the requirements of ASTM A706 for
composite of cement and foam insulation, a compos- low-alloy steel with a minimum yield strength of
ite of cement and wood chips, or other approved 60,000 psi (Grade 60) (414 MPa).
material suitable for supporting and containing con- R404.1.3.3.7.2 Location of reinforcement in
crete. Forms shall provide sufficient strength to con- wall. The center of vertical reinforcement in
tain concrete during the concrete placement basement walls determined from Tables
operation.
R404.1.2(2) through R404.1.2(7) shall be located
Form ties shall be steel, solid plastic, foam plas- at the centerline of the wall. Vertical reinforce-
tic, a composite of cement and wood chips, a com- ment in basement walls determined from Table
posite of cement and foam plastic, or other suitable R404.1.2(8) shall be located to provide a maxi-
1
material capable of resisting the forces created by mum cover of 1 / inches (32 mm) measured
4
fluid pressure of fresh concrete. from the inside face of the wall. Regardless of the
2018 INTERNATIONAL RESIDENTIAL CODE ® 125
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