"Tamko Valley"

In the "Tamko" valley, one slope (the shallower, if applicable) is completed first, with its courses running through the valley by at least 12 inches.

Next, full shingles are nailed end-to-end along a chalk line; a bead of roofing mastic adds insurance against uplift.

The opposite slope is completed with square-cut corners toeing the valley line.

A dab of mastic glues the sawtooth tips to the valley starter.

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