ll insulation shall be certified by Department of Consumer Affairs, Bureau of Household Goods and Services 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.”
Urea formaldehyde foam insulation may be applied or installed only if:
All insulating material shall be installed in compliance with the flame spread rating and smoke density requirements of the CBC.
Insulation installed in an existing attic, or on an existing duct or water heater, shall comply with the applicable requirements of Subsections 1, 2, and 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 1, 2, and 3 below.
EXCEPTION to Section 110.8(d)1: 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 1202.2 of Title 24, Part 2 or Section 806 of Title 24, Part 2.5.
Heated slab floors shall be insulated according to the requirements in TABLE 110.8-A.
Insulation Location | Insulation Orientation | Installation Requirements | Climate Zone | Insulation R-Value |
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 |
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.
EXCEPTION 1 to Section 110.8(i)1: Roofing products that are not certified according to Section 10-113 shall assume the following default aged solar reflectance/thermal emittance values:
A. For asphalt shingles: 0.08/0.75
B. For all other roofing products: 0.10/0.75
Product Type | CRRC Product Category | β |
Field-Applied Coating | Field-Applied Coating | 0.65 |
Other | Not A Field-Applied Coating | 0.70 |
EXCEPTION 1 to Section 110.8(i)4B: Aluminum-pigmented asphalt roof coatings shall meet the requirements of ASTM D2824 and be installed as specified by ASTM D3805.
EXCEPTION 2 to Section 110.8(i)4B: 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.
Physical Property | ASTM Test Procedure | Requirement |
Initial percent elongation (break) | D2370 | Minimum 200% @ 73° F (23° C) |
Initial percent elongation (break)OR Initial Flexibility | D2370 D522, Test B | Minimum 60% @ 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 | D2370 D522, 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% @ 73 ° F (23 ° C) |
Final percent elongation (break) after accelerated weathering 1000 h OR Flexibility after accelerated weathering 1000 h | D2370 D522, Test B | Minimum 40% @ 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 checking 1 |
1. Any cracking or checking visible to the eye fails the test procedure. |
A radiant barrier shall have an emittance of 0.05 or less, tested in accordance with ASTM C1371 or ASTM E408, and shall be certified to the Department of Consumer Affairs as required by Title 24, Part12, Chapter 12-13, Standards for Insulating Material.