Assume all elements of the roof assembly must last and function for at least 150 years.
Slate roof assembly.
Class a roof assemblies also include ferrous or copper shingles or sheets metal sheets and shingles clay or concrete roof tile or slate installed on noncombustible decks or ferrous copper or metal sheets installed without a roof deck on noncombustible framing.
The thickness of the slates also affects the weight.
This means using a roof deck material with a known and proven longevity of a century and a half which includes solid lumber at least 3 4 inch thick and some other decking materials such as nailable concrete and gypsum.
The installation of a natural slate roofing depends on the slate type the style and the design.
1 construct the roof properly.
Standard roof slate sizes range from 6 x10 to 14 x24 and everything in between.
The 6x10 slates require 686 slates per square a square is one hundred square feet of roof coverage while the 14x24 only require 98 slates per square.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
Slate and copper services is a family owned and operated company that was established in 1978.