North Country roofing shingles, when fixed with non-corroding nails or hooks, can provide a service life in excess of 100 years.
*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.
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
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
Impact Resistance of Natural Slate Testing Video
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.
I have never had anything except a 5 Star Experience when working with North Country Slate.
When our clients are looking for a natural slate roof, we highly recommend North Country Slate.
We have used North Country black on a large number of occasions, and we’ve found it to be an excellent quality slate it is very “workable”.