Competency 205 00 draw roof plans
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Competency: 205.00 Draw roof plans . Objective: 205.01 Identify terms and definitions related to roof plans. Roof Plans Terms & Definitions. Flat roof – common in areas with little rain or snow

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Competency 205 00 draw roof plans l.jpg

Competency: 205.00Draw roof plans

Objective: 205.01

Identify terms and definitions related to roof plans.


Roof plans terms definitions l.jpg
Roof PlansTerms & Definitions

  • Flat roof – common in areas with little rain or snow

  • Shed roof – offers the same simplicity and economical construction methods as a flat roof but does not have the drainage problems associated with a flat roof


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Roof PlansTerms & Definitions

  • Gable roof – one of the most common roof types in residential construction; constructed with two sloping sides that meet to form a ridge

  • Gambrel roof – a traditional shape that dates back to the colonial period; the lower level is covered with a steep roof surface, which connects into the upper roof system with a slighter pitch


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Roof PlansTerms & Definitions

  • Mansard roof – similar to a gambrel roof with the angled lower roof on all four sides rather than just two

  • Dutch hip roof – a combination between a hip roof and a gable roof


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Roof PlansTerms & Definitions

Roof plan – a drawing in plan view of the roof area showing the features and items on the roof

Roof pitch/slope – a description of the angle of the roof that compares the horizontal run and the vertical rise

Roof truss – a prefabricated member formed of triangular shapes used to construct a roof


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Roof PlansTerms & Definitions

  • Rafter – the inclined structural member of a roof system designed to support loads

  • Ridge – the top of a roof where two sloping edges meet

  • Ridge board – the top horizontal member that rafters are aligned against to resist their downward force


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Roof PlansTerms & Definitions

  • Ceiling joist – the horizontal member of the roof which is used to resist the outward spread of the rafters and to provide a surface on which to mount the finished ceiling

  • Soffit – usually the underside of an overhanging cornice


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Roof PlansTerms & Definitions

  • Fascia – covers the rafter end enclosing the overhang

  • Lookout – a beam used to support eave loads

  • Valley – the internal corner formed between two intersecting roof surfaces

  • Hip – the exterior edge formed by two sloping roof surfaces


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Roof PlansTerms & Definitions

Live load – fixed or moving weights that are not a structural part of the building; examples: furniture, occupants, snow on the roof, wind, etc.

Dead load – Static or fixed weights of the structure itself; examples: weight of roofing materials, foundation walls, siding, joists, etc.


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Roof PlansTerms & Definitions

  • Gable end wall – the triangular wall that is formed at each end of a gable roof between the top plate of the wall and the rafter

  • Knee wall – a wall of less than full height

  • Cornice/Eave – the part of the roof that extends out from the wall

  • Flashing – metal used to prevent water leaking through surface intersections


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