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Penn Cathedral Gray

Slate, known for its natural waterproof properties and the ability to be easily split into thin, smooth pieces, had already gained popularity as a roofing material in Europe. When significant deposits of this rock were uncovered on a nearby farm in the community of Slateford in 1836, it sparked the interest of European immigrants, who quickly initiated mining operations in the Lehigh Valley.

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History

Historically, Canadian slate quarries are common to Quebec, Newfoundland, and the eastern part of Ontario. From the early 18th century onwards, numerous regional quarries have opened and sometimes prospered, with most eventually closing.

Today, Canadian slate is still quarried on the border of Maine and Canada in St.-Marc-du-Lac-Long where the company North Country Slate operates. Established in the mid 1990's, North Country Slate produces North Country Black, a slate similar to Monson Slate (quarried in Maine); both are smooth and black in appearance. North Country Black can be seen on the B&O Railroad Museum in Maryland (pictured),  buildings throughout Cornell University in New York, and St. Michael's Cathedral in Toronto.

Info

Also called:
  • 100% natural product
  • Exceptionally durable, 125 to 175-year useful life
  • Proven historic performance & aesthetically pleasing
  • Non-combustible—Class A Fire Resistant
  • Resistant to acid rain, ultra-violet light & chemicals
  • Withstands freeze/thaw cycles & high temperatures
  • Rated Class 3 and Class 4 Hail Impact Resistance (3/4 to 2 inch ice balls)
Reclaimed
NEW

Data & ASTM

This Slate*
ASTM Standards*
Breaking Load
784 pounds
575 pounds minimum
Water Absorption
0.097"
0.25% maximum
Depth of Softening
0.0005"
0.002" maximum
ASTM Rating
S1
Lengths
Widths
Exposure**
24
12, 14
10.5
22
11, 12, 14
9.5
20
10, 11, 12
8.5
18
9, 10, 11, 12
7.5
16
8, 9, 10, 11, 12
6.5
14
7, 8, 9, 10, 11, 12
5.5
12
6, 7, 8, 9, 10, 12
4.5
Thickness (Inches)
Pounds per Square
Nominal 1/4 - 3/8
850 - 950
3/8 -1/2
1300 - 1400
1/2 - 3/4
1800 - 2100
3/4 - 1
2700 - 3000
1 - 1 1/4
3600 - 4000
* As tested by ASTM. Test report available upon request.
**3" Headlap, inches

Projects

Introduction to the Durable Slate Company
More than a roof.
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