Where do you put architectural shingles?

Similarly one may ask, where do you nail architectural shingles?

Lay one row of shingles, starting from the lower left corner of the roof. This row should project half an inch (1.27 centimeters) over the eaves. Nail down the shingles as you go along. Lay the next row of shingles, directly on top of the first row, making the row two tiles thick.

Additionally, do you need a starter course with architectural shingles? Every roof has to start somewhere, and that somewhere is at the appropriately named starter shingle (also called starter strip). Starter shingles are the initial shingle products installed on the roof, just before the first course of the finish shingles, which will comprise the visible parts of the roof.

Moreover, which side of the valley do you Shingle first?

Each end shingle strip should have the upper corner trimmed and set in a bead of roof cement. NRCA recommends shingles first be installed on the valley side with the lowest slope or shortest distance to the ridge. If all conditions are equal, either side may be installed first.

Should roofing nails go through the sheathing?

A 1″ nail will fully penetrate through 3/8″ roof sheathing, but it won't fully penetrate 1/2″ sheathing. The other way to determine if the proper nails were used is to look in the attic; if the roof has 1/2″ sheathing, you should be able to see the nails sticking through in to the attic.