Section 1333 - Foundation Systems(a) Pursuant to Health and Safety Code section 18551, the requirements for MH-unit and commercial modular foundation systems are applicable throughout the state.(b) The foundation system and the connection of a MH-unit to the foundation system shall be designed to withstand the vertical and lateral forces due to dead load, roof and floor live loads, wind and seismic loads in accordance with the provisions of the California Residential Code and local soil conditions. The roof live load, wind and seismic loads as established for dwellings within specific local areas shall apply.(c) The foundation system and the connection of a commercial modular to the foundation system shall be designed to withstand the vertical and lateral forces due to dead load, roof and floor live loads, wind and seismic loads in accordance with the provisions of the California Building Code and local soil conditions. The roof live load, wind and seismic loads as established for permanent buildings within specific local areas shall apply.(d) The vertical and lateral load resisting elements shall be sized and located to resist the loads specified in the manufacturer's installation instructions. The manufacturer's installation instructions shall become a part of the foundation system plans. In the absence of the manufacturer's installation instructions, plans and specifications signed by an architect or engineer covering the installation of an individual MH-unit or commercial modular shall be provided to the enforcement agency.(e) The foundation system and the connection of the MH-unit or commercial modular to the foundation system shall be capable of withstanding the vertical and lateral loads shown in the manufacturer's installation instructions, or plans and specifications signed by an architect or engineer, including locations where there are concentrated loads.(f) When an MH-unit or commercial modular is installed on a foundation system, a foundation system plan shall be provided to the enforcement agency. The manufacturer may provide a foundation system plan in its installation instructions, or a foundation system plan may accompany the installation instructions. Foundation systems may be approved by the enforcement agency or the department. Foundation systems approved by the department shall be accepted by every enforcement agency as approved for the purpose of obtaining a construction permit when the design loads and conditions are consistent for the locality. The department shall require that foundation system plans and supporting data be signed by an architect or engineer.(g) Local enforcement agencies shall not require the original signature or stamp of the architect or engineer on a foundation plan approved by the department.(h) Foundations for cabanas, porches, and stairways which are accessory to MH-units on foundation systems and foundations for building components shall be subject to approval of the enforcement agency. Porches and stairways which are accessory to commercial modulars on a foundation system shall be subject to approval of the enforcement agency.(i) When it is necessary for the department to approve plans or to make investigations of complaints relating to foundation system plans, fees shall be paid in accordance with section 1020.9 of article 1.(j) A standard plan approval may be obtained from the department for a plan for MH-unit or commercial modular foundation systems. The requirements for obtaining a standard plan approval are contained in section 1020.9 of article 1.(k) Multifamily manufactured homes consisting of three (3) or more dwelling units shall be installed on a foundation system pursuant to Health and Safety Code section 18551(a) or (b).(l) In flood hazard areas, foundation systems must be capable of resisting loads associated with flood and wind events or combined wind and flood events, and homes must be anchored to prevent floatation, collapse, or lateral movement. (1) The foundation installation instructions must indicate whether:(A) The foundation specifications have been designed for flood-resistant considerations, and, if so, the conditions of applicability for velocities, depths, or wave action; or(B) The foundation is not designed to address flood loads.(2) This subsection becomes operative August 1, 2013.Cal. Code Regs. Tit. 25, § 1333
1. New section filed 12-21-79 as an emergency; designated effective 1-1-80. Certificate of Compliance included (Register 79, No. 51).
2. Amendment of subsection (f) filed 8-22-85; effective upon filing pursuant to Government Code Section 11346.2(d) (Register 85, No. 36).
3. Amendment filed 8-22-85; effective thirtieth day thereafter (Register 85, No. 36).
4. Amendment of section heading, section and NOTE filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28).
5. Amendment of subsections (b) and (i) filed 1-21-2009; operative 1-21-2009 pursuant to Government Code section 11343.4 (Register 2009, No. 4).
6. Amendment of subsection (b) filed 2-18-2011; operative 2-18-2011 pursuant to Government Code section 11343.4 (Register 2011, No. 7).
7. Amendment of subsection (a), new subsections (c), (g) and (l)-(l)(2) and subsection relettering filed 2-19-2013; operative 4-1-2013 (Register 2013, No. 8). Note: Authority cited: Section 18300, Health and Safety Code. Reference: Sections 18551 and 18008.7, Health and Safety Code.
1. New section filed 12-21-79 as an emergency; designated effective 1-1-80. Certificate of Compliance included (Register 79, No. 51).
2. Amendment of subsection (f) filed 8-22-85; effective upon filing pursuant to Government Code Section 11346.2(d) (Register 85, No. 36).
3. Amendment filed 8-22-85; effective thirtieth day thereafter (Register 85, No. 36).
4. Amendment of section heading, section and Note filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28).
5. Amendment of subsections (b) and (i) filed 1-21-2009; operative 1-21-2009 pursuant to Government Code section 11343.4 (Register 2009, No. 4).
6. Amendment of subsection (b) filed 2-18-2011; operative 2-18-2011 pursuant to Government Code section 11343.4 (Register 2011, No. 7).
7. Amendment of subsection (a), new subsections (c), (g) and (l)-(l)(2) and subsection relettering filed 2-19-2013; operative 4-1-2013 (Register 2013, No. 8).