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Roof Connection Details

Learn the key elements of eave and rake details in architectural design, focusing on the incorporation of the roof into the wall assembly. Explore terms like fascia, soffit, slope, and more for a detailed understanding.

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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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