The Recreation Vehicle Industry Association (RVIA) on Nov. 2 issued a Standards News Bulletin to recreation park trailer manufacturers clarifying measurements for member companies building recreation park trailers, a number of which have recently joined Reston, Va.-based RVIA. The bulletin from the office of Bruce A. Hopkins, vice president of standards and education, states:

This Standards News Bulletin is intended to address the issues associated with measuring the size and calculating the square footage of a Recreation Park Trailer (RPTs).

RPTs built by RVIA members for sale in the U.S. must be 400 sq. ft. or less in gross trailer area. The RVIA position regarding what is included in the measurement will continue to be based on the “shadow rule.” This rule presumes that the square footage of any RPT or RV is based on the dimensions of a shadow cast by the unit at high noon with the roof removed…

When measuring the dimensions of the recreation park trailer to calculate the square footage, measurements must be taken on the exterior. Square footage includes all siding, corner trims, moldings, storage spaces, and areas enclosed by windows but not the roof overhang. This means bay windows are included regardless of their height or location. Porches, patios, decks, and enclosed door entries are not considered interior space and are not included in the square footage calculation…

To qualify as a porch, patio, or deck the area cannot be enclosed in any manner with the exception of guardrails and roof supports. Also the RPT must have an exterior finish material that makes the structure useable without the addition of the porch, patio, or deck.

Porches manufactured as an integral part of the RPT must also meet all applicable requirements in Chapter 5 of ANSI A119.5. Loft areas with a ceiling height of less than 5’0” are not considered as part of the square footage calculation… This means any loft floor areas with a ceiling height of 5’0” or greater must be added to the total square footage calculation. In some cases where the ceiling height of the loft varies from under 5 feet to over 5 feet, only that portion of the loft area(s) that exceeds 5 feet would need to be added to the calculation. If a park trailer contains a “second story” with a ceiling height of over 5’0” all square footage of the second story must be included in the calculation.