Clearly you can still get three-tab shingles! I did a shed roof with them just a few months ago. Even if nobody uses them for re-roofing jobs, they're still needed for repairs. But the market for three-tab has dwindled seriously over the past ten years to the point where they're seldom used for new roofs. Lack of demand has made them more expensive (economies of scale), so the market has shifted to the point where suppliers stock mainly architectural shingles.
I've never been in a shingle plant, but I assume that when manufacturers add new plant capacity or replace old machines, the new machines are for metric shingles and can't process three-tab.
As for the ridge shingles, these start out life as three-tabs, but are scored so you don't have to cut them by hand. Presumably they're processed by the same machines used to make standard three-tab shingles.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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