Standard
lengths are 12", 14", 16",
18", 20", 22" and 24".
Standard widths vary somewhat depending on
the lengths. The narrowest common width is
1/2 the height (for example: 12" x
6", 14" x 7", 16" x
8" etc.). Dimensions of 13" are
traditionally avoided. In recent years, with
the influx of slate from outside the US,
metric sizes are increasingly common. Slate
sizes outside the "normal" range
are available but are often more expensive
due to the non-standard production
requirements.
Slate
roofing is normally priced by the
"square." One square of slate is the
amount of slate necessary to cover 100 square
feet of roof area. The number of slates
required to cover 100 square feet of roof
varies with the slate size.
Standard
thickness for most slate production is
"nominal 1/4" (approximately
3/16" to 5/16"). Thicker slate
generally costs more and because of the
increased weight, is more expensive to ship
and install. Weight per square increases with
the thickness. The rule of thumb is 750 pounds
for one square of nominal 1/4" slate and
increasing proportionally with an increase in
thickness. (1500 pounds per square for
1/2" slate, 2250 pounds per square for
3/4" and so on...)
We
also install Tamko Lamarite and Slate Select
products
Both
offer a 50 year warranty.
