Ralph Smith

Okay, As posted the caps are three layers, manufacturers find miniscule installation variants to exclude warranty,and cutting 60' of caps takes about 15 minutes! These cracks are not a concern unless when in the attic, you can see daylight! Valleys are different for obvious reasons. If you feel thje need to say something, ther is roof cement in a tube that will fill the crack and still look good Ralph

Hi Mike - Scott, This is definatly a type of nylon reinforced PVC single ply membrane. Comes in 5', 7', 10, 20' x 50' or 100'rolls. Can be fastened mechanically or adhered. Larger rolls are usally ballested with large round gravel.