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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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