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Roof Connection Details

Roof Connection Details. Eave & Rake Details. Definition: Architectural details that incorporates the roof to the wall assembly Common members included in details: fascia and fascia trim soffit and soffit vents lookout or outrigger slope/pitch rafter and ceiling joist double top plate.

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Roof Connection Details

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  1. Roof Connection Details

  2. Eave & Rake Details • Definition: Architectural details that incorporates the roof to the wall assembly • Common members included in details: • fascia and fascia trim • soffit and soffit vents • lookout or outrigger • slope/pitch • rafter and ceiling joist • double top plate

  3. Terms to Know--Rake Detail • Definition: Detail taken at the sloped edge of roof or at the gable end of the building, usually this detail is perpendicular to Eave Details

  4. Terms to Know--Fascia • Finished member secured to end of rafters • Some construction include a sub-fascia in preparation to receiving a finished fascia.

  5. Soffit Area Terms to Know--Soffit • Enclosed/boxed-in area or open area below rafters on the overhang of a roof

  6. Terms to Know--Eave Detail • The projecting portion of the roof parallel to the slope. Sometimes called the cornice detail • To draw eave detail, architect needs to know • roof material--wood vs. composition shingles • rafter size & spacing • roof/eave overhang • roof slope/pitch • roof sheathing • exterior wall sheathing • eave design Eave Detail

  7. Roof Pitch • Pitch • Rise over Span • Always reduced to the smallest fraction

  8. Roof Slope • Slope • Slope is stated as a ratio of rise over run with run, run is 1/2 of span but is always expressed as a base of 12 • Slope is placed on a detail as a upside down triangle with 12 (run) horizontal line and rise by the vertical line

  9. Drafting Slope in a Detail • Assume the slope is 6:12 as shown below • All is necessary is to determine hypotenuse of a triangle having a base of 12 units and the leg of 6 units • Draft a line 12” long using the scale of your drawing • Then a vertical line 6” long with the same scale • The diagonal is the slope for this problem SLOPE LINE for DETAILING 6” LEG LINE 12” BASE LINE

  10. Calculations for Slope • Problem: Span of a building is 30’, Rise is 5’, what is the slope? • Run = 1/2 Span = .5 x 30 = 15 • Slope = Rise/Run = 5/15 = x/12 (Convert) 15x = 5x12 • x(new rise) = (5x12)/15 • x(new rise) = 4 SLOPE = 4:12

  11. Eave Designs 1) Exposed tail rafters 2) Enclosed (Boxed) or Open Soffit 3) Fascia Styles and Designs

  12. 1) Exposed Tail Rafters • An exposed wood member that is spliced to the common rafters • Usually thicker than common rafter with the spacing further apart

  13. Boxed Cornice--Soffit Styles • 1) Boxed Horizontal • 2) Boxed Parallel to rafter, sloped • 3) Either styles can be Open or Enclosed

  14. Slopped Open Soffit Boxed Horizontal Soffit 2) Boxed (Enclosed) verses Open Soffit • Boxed Horizontal or Boxed Parallel to rafter and sloped Open Soffit

  15. Soffit Design Considerations • 1) Must make provision for ventilation • eave soffit (intake) and attic (exhaust) • 2) Determine area of ventilation • Attic area (x) 1/150 = total area of ventilation req’d (net free area) • 3) Determine location of ventilation • eaves-- soffit contiuous vs. soffit cutout • gable ends--square, rectangle, round or triangle shape • ridge --continuous along roof ridge • roof --various types projecting out of the roof

  16. Ventilation Products/Suppliers Ventilation Types: 1) Roof Louvers 2) Gable Louvers 3) Ridgeline Vents 4) Gravity Turbines 5) Power Vents

  17. Fascia vertical to rafter 3) Fascia Styles and Designs • vertical vs perpendicular Fascia perpendicular to rafter

  18. Drafting the Eave Detail • It is recommended to complete the eave detail design before drafting other roof details • Common eave/cornice detail scale sizes: 1 1/2" = 1'-0" 3/4" = 1'-0" 1" = 1'-0"

  19. Rake Detail • Rake - assembly along sloping edge of roof • Usually different overhang from eave • No need to “notch” for rafters

  20. Detail Example Eave Detail Notes Scale: 1 1/2” = 1’-0” • 5-Ply built-up roof w/ 50# building felt@ edge • 3/4” CDX plywood • 5/8” GB (Interior finish) • 38R fiberglass batt insulation(12”)(ceiling) • 2x8 CLG Joist @24”OC Pre-fab trusses optional • 1x6 T&G siding over 1/2” OSB 15# felt between (Match previous details) • Add 1x3 trim at fascia • Full fiberglass batt insulation in wall

  21. Detail Notes ContinuedScale: 1 1/2” = 1’-0” • Attic insulation R38- 12” foil faced fiberglass batt • 2x8 rafter and ceiling joist @ 24” OC (or prefab wd truss) • 1/2” AC exterior plywood soffit • 7/8” stucco exterior finish w/ 1x2 redwood ground at top next to soffit • 24” overhang (from stucco to fascia) • 2x4 lookout @ 24” OC • R11-3 1/2” craft faced fiberglass batt in (2x4 studs @ 16” OC

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