Roofing With Slates
Perhaps no other roofing material lasts as long as slate. Incredibly, come old churches and homes from America’s colonial period still have their original slate roofs. Slate is still in demand for updscale custom homes, churches, and country-club clubhouses, but most new instead, because they are so much cheaper.
Like asphalt shingles, slate comes in many colors, sizes, grades, and weights. Due to its weight – three times that of asphalt – roof rafters and roof sheathing need to be up to code to support slate’s heavy load. Slate can be placed over a layer of composition shingles only if the slope of the roof is 4-in-12 or more, and only if a structural engineer has confirmed that the roof framing can bear the weight of 7 pound per square foot.
Today, only handfuls of roofing companies specializing exclusively in slate are in business. Most roofing contractors will do occasional slate roofs. And because it is difficult to cut and apply, slate roofing is not an easy job for the do-it-yourselfers. If you do decide to do the work, expect to make a considerable investment in time and materials.
Slate should be installed tilted slightly upward at the eaves,...