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Define pitched roof and its types

Short answer

A pitched roof has sloping surfaces >10° (typically 25-45°) for quick drainage. Types: lean-to (single slope), gable (two slopes), hip (four slopes), gambrel (two slopes per side), mansard (double slopes on four sides), hip-and-valley, Dutch gable, north-light (saw-tooth), butterfly (V-shape), and conical/pyramidal. Advantages: good drainage, attic space, suitable for rainy/snowy regions.

Define pitched roof and explain its various types with examples.

A pitched roof (sloping roof) is a roof with one or more sloping surfaces, the slope being more than 10 degrees (usually 25-45 degrees), so that rain and snow drain quickly. It is formed of timber or steel rafters/trusses covered with tiles, slates, sheets or thatch.

Types of pitched roof

TypeDescription and example
Lean-to roofSingle slope resting against a taller wall; verandah, shed, outhouse
Gable (saddle / couple) roofTwo slopes meeting at a ridge, with gable ends; ordinary houses
Hip roofAll four sides sloping; good wind resistance, no gable wall; bungalows
Gambrel roofTwo slopes on each side, the lower one steeper; barns
Mansard roofTwo slopes on each of the four sides, the lower about 60-70 degrees and the upper about 30 degrees; gives usable attic space
Hip-and-valley roofHipped roofs meeting at valleys over L- or T-shaped plans
Dutch gable roofHip roof with a small gable at the top of each end; ventilates the attic
North-light roofSeries of saw-tooth slopes, with the steep glazed face towards the north for even daylight; factories, workshops
Butterfly roofTwo slopes falling towards the centre (V shape) with a central gutter
Conical / pyramid roofSlopes meeting at a point over circular or square plans; towers
 Lean-to       Gable (couple)    Hip
    /|             /\            /--\
   / |            /  \          /    \
  /__|           /____\        /______\

 Mansard           North light
   ____             /|  /|  /|
  /    \           / | / | / |
 /      \         /__|/__|/__|
 |      |

Advantages

  • Quick drainage of rainwater, with less chance of leakage.
  • Cheaper for large spans with light coverings; space under the roof for an attic.
  • Good in rainy and snowy regions like Nepal.

Disadvantages

  • Requires more maintenance (repairs), is less fire-resistant, and gives no usable terrace.

✓ Answer checked by Claude Opus 5.5 (high effort)

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