Pattern catalogs were available from some quarries and slate distributors in the past.
Random width slate roof.
An excellent explanation of random width natural vermont roofing slates in the following quote from the slate book by brian stearns alan stearns and john meyer.
Accents may include floral and geometric patterns dates words or names.
If the next slate length is 18 inches the gauge is seven and a half inches which will apply to all the 18 inch courses except the first one the drop course.
Further the slate cladding along with the copper accents add an old world style and sophistication to this newer style home.
The largest percentage of widths shipped will be approximately 2 3 the length of the slate being used.
For example on a roof which starts with 20 inch slates at the eaves the 20 inch slate minus three inch head lap gives an eight and a half inch lath gauge.
Even though the two styles share some of the same attributes random width slate roofs are cut to one length and thickness in a variety of widths.
Random width slate roofs random width slate roofs share the attributes of a standard slate installation but employ slates of one length and thickness in a variety of widths.
A variety of widths will generally be provided by the quarry.
Slate tiles were provided in a variety of lengths and widths for this project 20 x random width 18 x random width 16 x random width and 14 x random width.
On residential slate roofing projects 16 to 18 random width 16 x 8 or 10 18 x 12 and 20 x 10 constant width are the most common sizes.
A random width slate roof offers more texture and less uniformity than a standard slate roof.
Slate was also used as siding on the multiple dormers.
The smallest percentage will be of the largest widths.
On commercial slate roofing projects 16 18 and 20 random are often seen but 20 x 10 and 24 x 12 are more common on large formal projects.