© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting: Unit 5 Slide 1 Unit 5 Roofs

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 2 Roofs Eave on the roof extends beyond the walls Cornice is the covering on the eaves Fascia is trim placed at the end of the rafters Roof sheathing covers structural members Skip sheathing is used with either tile or shakes

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 3 Roofs

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 4 Roofs Finished roofing is the weather protection system Pitch describes the slope of the roof  Rise is the vertical distance of the slope  Run is the horizontal distance of the slope Span is the horizontal measurement between inside edges of supporting walls

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 5 Roofs

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 6 Roofs Conventional framing involves the use of wood members placed in a repetitive fashion

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 7 Roofs Ridge board is the horizontal member at the ridge and runs perpendicular to the rafters

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 8 Roofs Rafters are the sloping members used to support roof sheathing and finished roofing

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 9 Major Roof Types

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 10 Flat Roofs One of the simplest and most economical roofs

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 11 Shed Roof Less drainage problems compared to flat roof Can be built at any pitch

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 12 Hip Roofs Hip rafter is used on the slopes of the hip Valley rafter is used on the slopes of the valley

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 13 Gable Roof Two shed roofs meet at a ridge Two or more gables meet to form a hip or valley

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 14 Gable Roofs

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 15 Gambrel Roof Traditional shape from colonial period Upper roof is greater pitch than lower roof Reduces cost of siding

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 16 Dormers Opening in a roof to allow for a window Used in gable or hip roof

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 17 Roof Coverings Roof materials depend on the pitch, style, structure cost, and weather Squares are used to order roofing materials  A square covers 100 sq. ft. of surface Roofing materials also effect the framing members and foundation

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 18 Built-up Roofing Used with pitch below 3/12 Felt and asphalt is commonly use for flat or low-sloped roof Hot asphalt is spread between the layers of roofing material

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 19 Shingles Minimum pitch is 4/12 with 15-lb felt underlayment Made of wood, asphalt, or fiberglass Most shingles are three-tab with a self- sealing adhesive on the back Wood shakes are thicker than shingles and more irregular in shape

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 20 Clay and Cement Tiles Used on expensive homes where the threat of fire is extreme Available in both curved and flat designs Pitch is usually 2½/12 or greater Roof will be much heavier with tiles

© 2006 ITT Educational Services Inc. CD230 Architectural Design & Drafting II: Unit 5 Slide 21 Metal Panels Easy to install and therefore less expensive Panels are made of 22- or 24-gage metal Provide good water and fire protection Available in widths of 18” or 24” Variety of metals are available including copper, stainless steel, aluminum and zinc