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

Competency: 205.00Draw roof plans

Objective: 205.01

Identify terms and definitions related to roof plans.

roof plans terms definitions
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
roof plans terms definitions3
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
roof plans terms definitions4
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
roof plans terms definitions5
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

roof plans terms definitions6
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
roof plans terms definitions7
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
roof plans terms definitions8
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
roof plans terms definitions9
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.

roof plans terms definitions10
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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