Felt that has been immersed in hot saturant
Scupper. Channel through parapet designed for peripheral
drainage of the roof, usually as safety overflow to limit
accumulation of ponded rainwater caused by clogged drains.
Scuttle. Curbed opening, with hinged or loose cover, providing
access to roof (synonymous with hatch).
Self-healing. Property of the least viscous roofing bitumens,
notably coal-tar pitch, that enables them to seal cracks formed
at lower temperatures.
Selvage joint. Lapped joint detail for two-ply, shingled roll-
roofing membrane, with mineral surfacing omitted over a
transverse dimension of the cap sheets to improve mopping
adhesion. For a 36-inch-wide sheet, the selvage (unsurfaced)
width is 19 inches.
Shakes. A wood roofing product that is split from a log and
shaped by the manufacturer for commercial use. The three basic
types of wood shakes are:
- handsplit and resawn shakes
- taper split shakes
- straight split shakes
Shark fin. Curled felt projecting up through the aggregate
surfacing of a built-up membrane.
Shingles. Asphalt saturated roofing felt coated on both sides
with asphalt, alone or stabilized with a finely powdered mineral
material, the top coating usually being significantly thicker
than the back coating and covered with roofing granules impressed
in its surface. Most commonly used 12 inch x 36 inch, 3 tab
self-sealing strip shingle.
Shingling. The pattern formed by laying parallel felt rolls with
lapped joints so that one longitudinal edge overlaps the
longitudinal edge of one adjacent felt, whereas the other
longitudinal underlaps the other adjacent felt. (See Ply.)
Shingling is the normal method of applying felts in a built-up