Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> ridge
The crossed ridges of England's Salisbury Cathedral.
If the two roof surfaces are not parallel then the intersection will not be horizontal but have a slope and strictly speaking should be called a hip.
It is common to have the roof surfaces at different angles, or at a different pitch, but as long as they are parallel then where the surfaces meet they will form a horizontal or level ridge.
If two walls are slightly out of parallel, say a few inches in the length of a house and a standard roof is sat on them, they will produce a ridge line that is not level. This is to most people vaguely unsettling though they cannot say why. The roofing carpenter of builder should make adjustments to the roof frame to make sure that the ridge-line is level.
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