California Code of Regulations › Title 25 - Housing and Community Development › Division 1 - Housing and Community Development › Chapter 2 - Mobilehome Parks and Installations › Article 7 - MH-Unit and Commercial Modular Installations and Facilities › Section 1336 - Wind Load Calculation

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
Wind load is calculated as follows:
(a) From the exterior of the MH-unit, measure
				  the total length of the exposed side wall in feet and in fractions of feet.
				  Then measure the height of the exposed side wall in feet and fractions of feet,
				  measuring from the point of connection of the side wall with the roof to the
				  bottom of the sidewall, excluding any skirting installed at the site. Multiply
				  the measurement of the length of the side wall by the measurement of the height
				  of the side wall to obtain the exposed square footage of the side
				  wall.
(b) From the exterior of the
				  MH-unit, measure the total length of the exposed roof in feet and fractions of
				  feet. Then measure the height of the exposed roof in feet and fractions of
				  feet, measuring vertically from the point of connection with the side wall to
				  the peak of the roof. Multiply the measurement of the length of the roof by the
				  measurement of the height of the roof to obtain the exposed square footage of
				  the roof. Divide the square footage by two, in order to compensate for the
				  reduced wind load against a pitched roof.
(c) Add the square footage obtained in the
				  calculation described in subsection (a) to the square footage obtained in the
				  calculation described in subsection (b) to obtain the total square footage of
				  the exterior side of the MH-unit exposed to wind load.
(d) Multiply the square footage obtained in
				  the calculation described in subsection (c) by either the design wind load of
				  the MH-unit or by fifteen (15) psf, whichever is greater, to obtain the wind
				  load. The design wind load of the MH-unit is provided on the data plate
				  permanently affixed to the MH-unit.
EXAMPLE: The side wall of the MH-unit measures sixty-two
					 and one-half feet (62 ½ ') in length and ten feet (10') in height. The
					 roof of the MH-unit measures sixty-three and one-half feet (62 ½ ') in
					 length and four and one-third feet (4 1/3 ') in height. These measurements
					 result in a calculated wind load of 11,437 pounds using the above-described
					 method.
(a) 62.5 x 10 = 625 square
				  feet
(b) 63.5 x 4.33 = 274.96/2 =
				  137.48 square feet
(c) 625 + 137.48
				  = 762.48 square feet
(d) 762.48 x
				  15 = 11,437.2 or a 11,437 pound wind load.
1.
					 Renumbering of former section 1336 to section 1335 and new section filed 9-8-94
					 as an emergency; operative 9-19-94 (Register 94, No. 36). A Certificate of
					 Compliance must be transmitted to OAL by 1-17-95 or emergency language will be
					 repealed by operation of law on the following day.
2. Renumbering of
					 former section 1336 to section 1335 and new section refiled 1-18-95 as an
					 emergency; operative 1-17-95 (Register 95, No. 3). A Certificate of Compliance
					 must be transmitted to OAL by 5-17-95 or emergency language will be repealed by
					 operation of law on the following day.
3. Certificate of Compliance
					 as to 1-18-95 order transmitted to OAL 3-31-95 and filed 5-12-95 (Register 95,
					 No. 19).
4. Amendment of section and NOTE filed 7-6-2004; operative
					 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No.
					 28).
Note: Authority cited: Sections 18300, 18613 and 18613.4,
						Health and Safety Code. Reference: Section 18613.4, Health and Safety
						Code.