The formula for SLA in the November 2011 version of the RESNET Standard is 4 orders of magnitude too large. The multiplier is a unit conversion that is supposed to convert the denominator’s units of square feet to square inches, so as to cancel out the units of square inches in the numerator. Since there are 144 square inches per square foot, multiplying the denominator by 144 would convert the overall formula to a unit less parameter. Since 1/144≈0.00694, the formula’s multiplier should be 0.00694. To view the proposed amendment click on Proposed Correction of SLA The amendment is undergoing an ANSI compliant public review and comment process. Interested parties are encouraged to comment on the proposed amendment. Public comments on the proposed amendment will be accepted until Tuesday, May 1, 2012. To submit your comments click on RESNET Amendment Comment Online Form Comments are posted real time and you will be able to review comments that were submitted by clinking on Comments Submitted on Proposed Correction of SLA. Only comments submitted through the online system will be considered. After the comment period, the RESNET Technical Committee will consider and document each of the comments submitted and make appropriate changes. The revised proposed amendments then will be submitted to the RESNET Standards Committee who will review the public comment process then recommend to the RESNET Board for adoption.
