• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

721.2.1 Use and Application [HCD 1 & HCD 2 ]

Los Angeles Building Code > 7 Fire and Smoke Protection Features > 721 Prescriptive Fire Resistance > 721.2 Cellular Concrete. [HCD 1 & HCD 2 ] > 721.2.1 Use and Application [HCD 1 & HCD 2 ]
JUMP TO FULL CODE CHAPTER

Controlled-density cellular concrete, when used or applied, shall be in accordance with the use of materials in Bulletin No. 65 of the Federal Housing Administration, United States Department of Housing and Urban Development.

Exceptions:

  1. Regardless of the provisions of Subsections 3.2, 3.3, 3.4 and 3.6 in Section 3, Bulletin No. 65 provisions relating to proportioning, mixing and testing, in the following shall apply to this chapter.

    1. 1.1. Field-control weighings for control of the wet-unit weight shall be made. The design wet-unit weight for field control of the concrete shall be based on previously established data for the relation between the wet-unit weight and the air-dry-unit weight at 28 days for the mix being placed. Field-control weighings for determining the wet-unit weight shall be made at the mixer discharge and at the point of deposit. There should be one pair of weighings per batch for batch-type mixers unless equipment is provided with scales allowing the operator to adequately weigh materials.

      For continuous weight-instrumented batch mixers, there should be one pair of weighings per 10 cubic yards (7.65 m3). The gain in unit weight between the mixer discharge and point of deposit shall not exceed 5 percent. The wet-unit weight at the point of deposit of the concrete shall not exceed plus 5 percent of the design wet-unit weight. A variation exceeding plus 5 percent of the design wet-unit weight shall require a modification of the mix proportions, a change of materials or a change in the mixing procedure.

    2. 1.2. When tests are required by the enforcing agency, they shall be performed in the following manner:

      Two test cylinders, for compressive strength tests, shall be made for each 8,000 square feet (743 m2) of surface area placed. A minimum of two test cylinders shall be made each day. Each strength test result shall be the average of two cylinders from the same sample tested at 28 days or at a specified earlier date.

    3. 1.3. The minimum air-dry density shall be 90 pounds per cubic foot (1,440 kg/m3). The minimum design compressive strength shall be 1,000 psi (6,890 kPa) when the curing procedure specified herein is applied. The minimum design compressive strength shall be 1,250 psi (8,619 kPa) if the slab is placed in a covered area of a building and a specified curing medium is not applied. The specified design compressive strength shall be increased 20 percent when the specified strength is greater than 1,000 psi (6,890 kPa) and the slab is placed in a covered area of a building and a specified curing medium is not applied.
    4. 1.4. The cellular concrete shall be sampled at the point of deposit in accordance with the applicable procedures of ASTM C172, Sampling Fresh Concrete. Cylinder molds shall be either 3 inches by 6 inches (76 mm by 152 mm) or 6 inches by 12 inches (152 mm by 305 mm). Lightly tap the sides of the mold with a rubber hammer while filling the mold instead of rodding the mix. Moist cure the specimens for seven days at 73.4°F (40.8°C) plus or minus 3°F (1.7°C). At the age of seven days, remove the specimens from the moist condition and store in a temperature of 73.4°F (40.8°C) plus or minus 3°F (1.7°C) and a relative humidity of 50 plus or minus 10 percent for 21 days; remove and air dry until the time of test at 28 days. The compressive strength test shall be in accordance with ASTM C39, Compressive Strength of Cylindrical Concrete Specimens. Determine the air-dry-unit weight at 28 days.
  2. Regardless of the provisions of Subsections 4.1 and 4.2 in Section 4 of Bulletin No. 65, relating to placing, finishing and curing, the following shall apply to these regulations.

    1. 2.1. The concrete shall be placed, finished and cured to produce a level, smooth surface. The concrete shall be placed in a single layer to a minimum thickness of 11/2 inches (38 mm). The deviation from a plan shall not exceed 1/4 inch (6 mm) in any 10 feet (3048 mm). The final finish of the concrete shall be suitable for the application of the specified wear- resistant covering. Cracks wider than 1/8 inch (3 mm) shall be repaired.
    2. 2.2. Install a water-resistant membrane between wood or plywood subfloors and the cellular concrete to prevent leakage of the concrete and wetting of the subfloor. The membrane shall consist of waterproof paper or plastic sheets conforming to ASTM C171, Sheet Materials for Curing Concrete, or Type 15 roofing felt conforming to ASTM D226, D250 or D227, or Federal Specification UUB790, Building Paper Vegetable Fiber: (Kraft, Waterproofed, Water Repellent and Fire-resistant) Type 1, Grade B. The sheets shall be securely fastened to the subfloor.
  3. Regardless of the provisions of Subsections 6.1 and 6.2 in Section 6, of Bulletin No. 65, relating to applicator qualifications and warranty, these subsections are omitted from this chapter.

Related Code Sections


721.2.1 Fire and Smoke Protection Features, Use and Application [HCD 1 & HCD 2 ]
to produce a level, smooth surface. The concrete shall be placed in a single layer to a minimum thickness of 1 1 / 2 inches (38 mm). The deviation from ...
Los Angeles Building Code > 7 Fire and Smoke Protection Features > 721 Prescriptive Fire Resistance > 721.2 Cellular Concrete. [HCD 1 & HCD 2 ] > 721.2.1 Use and Application [HCD 1 & HCD 2 ]
408.1 Repairs, Materials
Plumbing materials and supplies shall not be used for repairs that are prohibited in the California Plumbing Code . [HCD 1 & HCD 2] Existing ...
Los Angeles Existing Building Code > 4 Repairs > 408 Plumbing > 408.1 Materials
1501.9 Alternate Water Sources for Nonpotable Applications, Signage [BSC-CG, HCD 1, HCD 2, HCD 1-AC]
of the California Building Code. Each sign shall contain 1 / 2 of an inch (12.7 mm) letters of a highly visible color on a contrasting background. The location ...
Los Angeles Plumbing Code > 15 Alternate Water Sources for Nonpotable Applications > 1501.0 General > 1501.9 Signage [BSC-CG, HCD 1, HCD 2, HCD 1-AC]
Section 1211 Interior Environment, [HCD 1 & HCD 2] Garage Door Springs
This section shall apply to applications listed in Sections 1.8.2.1.1 and 1.8.2.1.3 regulated by the Department of Housing and Community Development ...
Los Angeles Building Code > 12 Interior Environment > 1211 [HCD 1 & HCD 2] Garage Door Springs
Help Contact Us Privacy Terms
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code Compare
Code Compare
Highlight differences between any two building codes.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE