A5.205.3 Insulation and Roofing Products
SLAB INSULATION REQUIREMENTS FOR HEATED SLAB-ON-GRADE
| INSULATION LOCATION | INSULATION ORIENTATION | INSTALLATION REQUIREMENTS | CLIMATE ZONE | INSULATION R-FACTOR |
| Outside edge of heated slab, either inside or outside the foundation wall | Vertical | From 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 — 15 | 5 |
| 16 | 10 | |||
| Between heated slab and outside foundation wall | Vertical and Horizontal | Vertical 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 — 15 | 5 |
| 16 | 10 vertical and 7 horizontal |
MINIMUM PERFORMANCE REQUIREMENTS FOR LIQUID APPLIED ROOF COATINGS
| PHYSICAL PROPERTY | ASTM TEST PROCEDURE | REQUIREMENT |
| Initial percent elongation (break) | D2370 | Minimum 200 percent 73°F (23°C) |
| Initial percent elongation (break) OR Initial flexibility | D2370D522, Test B | Minimum 60 percent 0°F (-18°C) Minimum pass 1" mandrel 0°F (-18°C) |
| Initial tensile strength (maximum stress) | D2370 | Minimum 100 psi (1.38 Mpa) 73°F (23°C) |
| Initial tensile strength (maximum stress) OR Initial flexibility | D2370D522, Test B | Minimum 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 h | D2370 | Minimum 100 percent 73°F (23°C) |
| Final percent elongation (break) after accelerated weathering 1000 h OR Flexibility after accelerated weathering 1000 h | D2370 | Minimum 40 percent 0°F (-18°C) Minimum pass 1" mandrel 0°F (-18°C) |
| Permeance | D1653 | Maximum 50 perms |
| Accelerated weathering 1000 h | D4798 | No cracking or checking1 |
- Any cracking or checking visible to the eye fails the test procedure.
Urea formaldehyde foam insulation may be applied or installed only if:
- It is installed in exterior side walls; and
- 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.
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.
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.
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.
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:
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:
- Aluminum-pigmented asphalt roof coatings shall meet the requirements of ASTM D2824 or ASTM D6848 and be installed as specified by ASTM D3805.
- 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.