| |||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||
(1) heat leak at eave stops ice dam; (2) heated overhang
should extend out; (3) snow arrester and inside gutter prevent slippage
and icicles; (4) cold roof insulated from heat prevents damming, as does
flat roof. Drawing by Jocelyn Bates Helgerson |