.::. Some Random Terms .::. • Moss crepe Mossy Crepe or Sand Crepe (trade mark). Has a fine moss effect created by Plain. weave or small Dobby. Made with a spun-rayon warp and a filament rayon filling. The two-ply warp yarn is very coarse and bulkier than the filling. Mostly made in rayon and synthetics but some in silk. .... • Self-spacing tile Tile with lugs, spacers or protuberances on the sides which automatically space the tile for the grout joint. .... • Guarded hot box Test procedure used to accurately determined thermal conductance or heat flow through a non-homogeneous building section. The construction of the Guarded Hot Box and the procedure for test is governed by ASTM Test Method C236. Where accurate measurements of heat loss (U-value) through a building envelope are required, it is strongly recommended that this method of determination be used. ....