North Country roofing shingles, when fixed with non-corroding nails or hooks, can provide a service life in excess of 100 years.
- Requires minimal maintenance
- Durable and long lasting
- Resistant to chemical pollutants and acid rain
- Non-combustible and fireproof
- Unaffected by freeze/thaw cycles
- Environmentally safe
- Resistant to hail and other impact damage
- Performance proven on rooftops
- Delivered from stock
- Available in unfading or weathering colors
- Available in special shapes
- Available in a wide variety of sizes
- ASTM E108-10 Class A (highest) Fire Resistance Rating*
- FM4473 Class 3 or Class 4 Hail Impact Rating**
- ASTM D3161-15 Class F (highest) Wind Resistance Rating***
*As per 2015 International Building Code section 1505.2 and tested by the National Slate Association July 13, 2010.
**As tested by the National Slate Association February 25, 2010.
***As tested by the National Slate Association December 8, 2015.
Fire Resistance of Natural Slate Roofing – UL 790
“Standard Test Methods for Fire Tests of Roof Coverings ”
Natural slate received IBC Class A (highest fire rating available) Fire Resistance Rating when 1/4” thick, North American slate shingles were installed at a 3” headlap over No. 30 felt underlayment on a 1/2″ plywood roof deck.
Click on report – NSA Fire Resistance Of Slate Test Report
Complying with Factory Mutual FM 4473, Specification Test
Standards For Impact Resistant Testing Of Rigid Roofing Materials
By Impacting With Freezer Ice Balls.
3/8” thick, S-1 rated, North American produced roofing slate met Class 4 requirements, surviving the impact of 2” ice balls travelling at 76 MPH.
1/4″ thick, S-1 rated, North American produced roofing slate met Class 3 requirements, surviving the impact of 1 3/4″ ice balls travelling at 69 MPH.
Click on report – Hail Test Report
It is important to note that some insurance companies offer a reduction in residential insurance premiums when a Class 3 or Class 4 rating is met.
Impact Resistance of Natural Slate Testing Video
ASTM D3161/D3161M-15: Standard Test Method for Wind Resistance of Steep Slope Roofing Products (Fan-Induced Method)
Testing conducted by PRI Construction Materials Technologies LLC, 1/4’’ thick, S-1 rated, North American produced roofing slate met the requirements of the highest Class F (110 mph) roofing product.