The quarter-inch-per-foot rule — drain slope explained
Why horizontal drains slope 1/4 inch per foot, when 1/8 is allowed, and how to figure required fall for any run.
Learn
Guides for running a plumbing shop.
Plain-spoken, written from inside a working shop — the math, the board, the van, and the money. No fluff, no "10x your synergy."
Fixture units explained — WSFU vs DFU and why pipe sizing starts here
What water supply and drainage fixture units mean, how to count them, and why every sizing decision in a plumbing job starts with the total.
What is plumbing software? A shop owner's guide
What plumbing software actually covers — scheduling, dispatch, jobs, invoicing, drawings — and how to tell the categories apart before you buy.
Prefer the product?
Reading about it is the slow path.
The walkthrough shows the real board, a whole-home drawing, and an invoice — twenty minutes beats ten articles.