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// CODE SNIPPET

A5.205.3 Insulation and Roofing Products

Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products
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TABLE A5.205.3-A

SLAB INSULATION REQUIREMENTS FOR HEATED SLAB-ON-GRADE

INSULATION LOCATIONINSULATION ORIENTATIONINSTALLATION REQUIREMENTSCLIMATE ZONEINSULATION R-FACTOR
Outside edge of heated slab, either inside or outside the foundation wallVerticalFrom the level of the top of the slab, down 16 inches or to the frost line, whichever is greater. Insulation may stop at the top of the footing where this is less than the required depth. For below grade slabs, vertical insulation shall be extended from the top of the foundation wall to the bottom of the foundation (or the top of the footing) or to the frost line, whichever is greater.1 — 155
1610
Between heated slab and outside foundation wallVertical and HorizontalVertical insulation from top of slab at inside edge of outside wall down to the top of the horizontal insulation. Horizontal insulation from the outside edge of the vertical insulation extending 4 feet toward the center of the slab in a direction normal to the outside of the building in plan view.1 — 155
1610 vertical and 7 horizontal

TABLE A5.205.3-B

MINIMUM PERFORMANCE REQUIREMENTS FOR LIQUID APPLIED ROOF COATINGS

PHYSICAL PROPERTYASTM TEST PROCEDUREREQUIREMENT
Initial percent elongation (break)D2370Minimum 200 percent 73°F (23°C)
Initial percent elongation (break) OR Initial flexibilityD2370D522, Test BMinimum 60 percent 0°F (-18°C) Minimum pass 1" mandrel 0°F (-18°C)
Initial tensile strength (maximum stress)D2370Minimum 100 psi (1.38 Mpa) 73°F (23°C)
Initial tensile strength (maximum stress) OR Initial flexibilityD2370D522, Test BMinimum 200 psi (2.76 Mpa) 0°F (-18°C) Minimum pass 1" mandrel 0°F (-18°C)
Final percent elongation (break) after accelerated weathering 1000 hD2370Minimum 100 percent 73°F (23°C)
Final percent elongation (break) after accelerated weathering 1000 h OR Flexibility after accelerated weathering 1000 hD2370Minimum 40 percent 0°F (-18°C) Minimum pass 1" mandrel 0°F (-18°C)
PermeanceD1653Maximum 50 perms
Accelerated weathering 1000 hD4798No cracking or checking1
  1. Any cracking or checking visible to the eye fails the test procedure.

A5.205.3.1 Certification by Manufacturers

Any insulation shall be certified by Department of Consumer Affairs, Bureau of Home Furnishing and Thermal Insulation that the insulation conductive thermal performance is approved pursuant to the California Code of Regulations, Title 24, Part 12, Chapters 12-13, Article 3,"Standards for Insulating Material."

A5.205.3.2 Installation of Urea Formaldehyde Foam Insulation

Urea formaldehyde foam insulation may be applied or installed only if:

  1. It is installed in exterior side walls; and
  2. A four-mil-thick plastic polyethylene vapor barrier or equivalent plastic sheathing vapor barrier is installed between the urea formaldehyde foam insulation and the interior space in all applications.

A5.205.3.3 Flame Spread Rating

All insulating material shall be installed in compliance with the flame spread rating and smoke density requirements of the Title 24, Part 2, California Building Code.

A5.205.3.4 Installation of Insulation in Existing Buildings

Insulation installed in an existing attic or on an existing duct or water heater, shall comply with the applicable requirements of Subsections A5.205.3.4.1, A5.205.3.4.2 and A5.205.3.4.3 below. If a contractor installs the insulation, the contractor shall certify to the customer, in writing, that the insulation meets the applicable requirements of Subsections A5.205.3.4.1, A5.205.3.4.2 and A5.205.3.4.3 below.

A5.205.3.4.1 Attics

If insulation is installed in the existing attic of a low-rise residential building, the R-value of the total amount of insulation (after addition of insulation to the amount, if any, already in the attic) shall be at least R-38 in climate zones 1 and 16; and R-30 in all other climate zones.

Exception: Where the accessible space in the attic is not large enough to accommodate the required R-value, the entire accessible space shall be filled with insulation provided such installation does not violate Section 1203.2 of Title 24, Part 2, California Building Code.

A5.205.3.4.2 Water Heaters

If external insulation is installed on an existing unfired water storage tank or on an existing back-up tank for a solar water-heating system, it shall have an R-value of at least R-12 or the heat loss of the tank surface based on an 80°F water-air temperature difference shall be less than 6.5 Btu per hour per square foot.

A5.205.3.4.3 Ducts

If insulation is installed on an existing space-conditioning duct, it shall comply with Section 605 of the California Mechanical Code (CMC).

A5.205.3.5 Placement of Roof/Ceiling Insulation

Insulation installed to limit heat loss and gain through the top of conditioned spaces shall comply with the following:

A5.205.3.5.1

Insulation shall be installed in direct contact with a continuous roof or ceiling which is sealed to limit infiltration and exfiltration as specified in Section A5.205.2, including but not limited to placing insulation either above or below the roof deck or on top of a drywall ceiling; and

A5.205.3.5.2

When insulation is installed at the roof in nonresidential buildings, fixed vents or openings to the outdoors or to unconditioned spaces shall not be installed and the space between the ceiling and the roof is either directly or indirectly conditioned space and shall not be considered an attic for the purposes of complying with CBC attic ventilation requirements; and

A5.205.3.5.3

Insulation placed on top of a suspended ceiling with removable ceiling panels shall be deemed to have no affect on envelope heat loss; and

Exception: When there are conditioned spaces with a combined floor area no greater than 2,000 square feet in an otherwise unconditioned building and when the average height of the space between the ceiling and the roof over these spaces is greater than 12 feet, insulation placed in direct contact with a suspended ceiling with removable ceiling panels shall be an acceptable method of reducing heat loss from a conditioned space and shall be accounted for in heat loss calculations.

A5.205.3.5.4

Insulation shall be installed below the roofing membrane or layer used to seal the roof from water penetration unless the insulation has a maximum water absorption of 0.3 percent by volume when tested according to ASTM C272.

Note: Vents, which do not penetrate the roof deck, that are designed for wind resistance for roof membranes are not within the scope of Section A5.205.3.5.2.

A5.205.3.6 Demising Walls in Nonresidential Buildings

The opaque portions of framed demising walls in nonresidential buildings shall be insulated with an installed R-value of no less than R-13 between framing members.

A5.205.3.7 Insulation Requirements for Heated Slab Floors

Heated slab-on-grade floors shall be insulated according to the requirements in Table A5.205.3-A.

A5.205.3.7.1

Insulation materials in ground contact must:

A5.205.3.7.1.1

Comply with the certification requirements of Section A5.205.3.1 and

A5.205.3.7.1.2

Have a water absorption rate for the insulation material alone without facings that is no greater than 0.3 percent when tested in accordance with Test Method A — 24 Hour-Immersion of ASTM C272.

A5.205.3.7.2

Insulation installation must:

A5.205.3.7.2.1

Cover the insulation with a solid guard that protects against damage from ultraviolet radiation, moisture, landscaping operation, equipment maintenance and wind; and

A5.205.3.7.2.2

Include a rigid plate, which penetrates the slab and blocks the insulation from acting as a conduit for insects from the ground to the structure above the foundation.

A5.205.3.8 Wet Insulation Systems

When insulation is installed on roofs above the roofing membrane or layer used to seal the roof from water penetration, the effective R-value of the insulation shall be as specified in Reference Joint Appendix JA4 of the California Energy Commission 2008 Building Energy Efficiency Standards for Residential and Nonresidential Buildings.

A5.205.3.9 Roofing Products Solar Reflectance and Thermal Emittance

A5.205.3.9.1

In order to meet the requirements of Sections 141, 142, 143(a)1, 149(b)1B, 151(f)12, 152(b)1H or 152(b)2 of Title 24, Part 6, a roofing product's thermal emittance and 3-year aged solar reflectance shall be certified and labeled according to the requirements of Section 10-113 of Title 24, Part 1.

Exception: Roofing products that are not certified according to Section 10-113 of Title 24, Part 1 shall assume the following default aged reflectance/emittance values:

A5.205.3.9.1.1

For asphalt shingles, 0.08/0.75

A5.205.3.9.1.2

For all other roofing products, 0.10/ 0.75

A5.205.3.9.2

If CRRC testing for 3-year aged reflectance is not available for any roofing products, the 3-year aged value shall be derived from the CRRC initial value using the equation Raged = [0.2 + 0.7[ρinitial—0.2], where ρinitial = the initial Solar Reflectance.

A5.205.3.9.3

Solar Reflectance Index (SRI), calculated as specified by ASTM E1980-01, may be used as an alternative to thermal emittance and 3-year aged solar reflectance when complying with the requirements of Sections 141, 142, 143(a)1, 149(b)1B, 151(f)12, 152(b)1H or 152(b)2 of Title 24, Part 6. SRI calculations shall be based on moderate wind velocity of 2-6 meters per second. The SRI shall be calculated based on the 3-year aged reflectance value of the roofing products.

A5.205.3.9.4

Liquid applied roof coatings applied to low-sloped roofs in the field as the top surface of a roof covering shall:

A5.205.3.9.4.1

Be applied across the entire roof surface to meet the dry mil thickness or coverage recommended by the coating manufacturer, taking into consideration the substrate on which the coating is applied, and

A5.205.3.9.4.2

Meet the minimum performance requirements listed in Table A5.205.3-B or the minimum performance requirements of ASTM C836, D3468, D6083 or D6694, whichever are appropriate to the coating material.

Exceptions:

  1. Aluminum-pigmented asphalt roof coatings shall meet the requirements of ASTM D2824 or ASTM D6848 and be installed as specified by ASTM D3805.
  2. Cement-based roof coatings shall contain a minimum of 20 percent cement and shall meet the requirements of ASTM C1583, ASTM D822 and ASTM D5870.

Related Code Sections


A5.205.3 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Insulation and Roofing Products
, including but not limited to placing insulation either above or below the roof deck or on top of a drywall ceiling ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products
A5.205.3 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Insulation and Roofing Products
, including but not limited to placing insulation either above or below the roof deck or on top of a drywall ceiling ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products
A5.205.3.5.4 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4],
Insulation shall be installed below the roofing membrane or layer used to seal the roof from water penetration unless the insulation has a maximum ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products > A5.205.3.5 Placement of Roof/Ceiling Insulation > A5.205.3.5.4
A5.205.3.5.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4],
Insulation shall be installed in direct contact with a continuous roof or ceiling which is sealed to limit infiltration and exfiltration as specified ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products > A5.205.3.5 Placement of Roof/Ceiling Insulation > A5.205.3.5.1
A5.205.3.5.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4],
Insulation shall be installed in direct contact with a continuous roof or ceiling which is sealed to limit infiltration and exfiltration as specified ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.205 [OSHPD 1 & 4] Building Envelope > A5.205.3 Insulation and Roofing Products > A5.205.3.5 Placement of Roof/Ceiling Insulation > A5.205.3.5.1
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