Floor Cavity Ratio

From Swikipedia

Introduction

Floor Cavity Ratio is a number indicating floor cavity proportions calculated from length, width, and height. The work-plane, the floor, and the wall surfaces between them forms the floor cavity.

The formula is given below:

Floor Cavity Ratio = [5 x Floor Cavity Depth x (Room Length x Room Width)] ÷ Room Length x Room Width

References:

http://whygreenbuildings.com/glossary.php

http://www.lightingdesignlab.com/articles/formulas/useful_formulas_zonal.htm