A (rather snarky) piece about it here: https://mcmansionhell.com/post/149948821221/mcmansions-101-roofs https://mcmansionhell.com/post/149948821221/mcmansions-1

A (rather snarky) piece about it here: https://mcmansionhell.com/post/149948821221/mcmansions-101-roofs https://mcmansionhell.com/post/149948821221/mcmansions-101-r... tl;dr - It's driven by internal room shape requirements (plus weak planning; in some jurisdictions "no, that's an eyesore mess, redesign it" it a thing in planning, but I gather largely not in most US juristicitions).