Insert two nails per wood shingle, 3/4 inch from each side, and 1 inch up from the exposure line. The exposure line is the location where the bottom edge of the shingle placed above will rest.
With shakes, between each subsequent course install an 18 inch wide piece of builder's felt, with the lower edge of the felt halfway between the next exposure line and the end of the wood shingle.
Comparing its 9-by-31/2-inch footprint to that of a conventional UV exposure line
, CreoScitex said two or three TrendSetters may fit into existing space, providing speed and backup similar to a multi-imager Newsetter line.