Guides

Working notes from the bench: the arithmetic and the trade rules behind door prep, written out in full rather than summarised.

How much to cut off a prefit door

The frame is already on the wall. Working out what comes off each leaf, with a real pair measured on the bench.

Full Lite with 5 Lite: one pane, not five

One pane, divided five ways — not five panes. What to buy, what not to, and why getting it wrong is wrong in both directions at once.