GABLE ENDS, VERGE, EAVES & ERECTION OF GABLE ROOFS

Created by Michael Martin April 2004 / Reviewed & updated March 2010

Gable Ends, Verge, Eaves & Erection Procedure

Your ref: Carp. 11 – P40 to 55 Three main methods to finish gable

ends Flush gable – No eaves Flush gable – raked eaves Boxed gable

Flush Gable

This Means: end of gable is flush or in-line with outside face of end wall

No overhang, just barge fixed flush

Can be applied to timber clad home

Or brick veneer Or cavity brickwork Stud frame at gable

ends are at same centres as wall frames

Flush Gable with raked eaves / verge overhang

End of roof extends over end of wall

Sometimes also referred to as verge overhang

Ridge and / or purlins can be extended for extra support

Framing variations – raked eaves / verge

Top plates may also extend to support the rafter

With possible addition of stiffener

Variations – canter lever gable frame

Typical in some older Bungalow style federation homes

Gable end rafters are notched to take trimmer or outrigger support

Variations – cont.

Extend purlin if necessary for additional support

Boxed Gable

If this is desired finish Extend purlins and

plates Also include bottom

chord or tie to extend gable

Provide gable studs Line with required

finish

Verge Finishes

Your ref: P44 This is the section at

the end of the gable roof

Where roof surface meets the barge or the verge board

Finishes depend on roofing material

Patent verge finishes

See page 45 Steel colourbond

facias are becoming more & more popular

Verge finishes are made to match

Eave Finishes

Eaves finish is relevant to house design – can be

Boxed eaves Raked eaves Open eaves

Eaves clearance

Where timber eaves framing passes over face of brick walls

Allow 12mm min. clearance between soffit bearer & brick

Allows for shrinkage in frame

If no clearance top brick may tilt under load

Erection of Gable roof

After ceiling frame complete Measure & cut ridge to length Mark rafter centres Allow extra if gable overhang

Erection procedure Erect pair of rafters

at each end Nail through one

side into end of rafter

Align opposing rafter and skew nail

Erection procedure Plumb one end &

attach a temporary brace

This prevents raking Attach string line on

top of ridge Block and check

while fixing remaining rafters

Erection procedure Set out and fix

purlins into position Cut & fix struts for

whole roof Cut & fix collar ties

Erection procedure Fit permanent wind

bracing Can be opposing

timber braces Or metal speed

braces

Erection procedure

Cut and fix gable studs Onto bottom chord or tie

piece

Erection procedure If not pre-determined Calculate drop off and

mark overhang Mark plumb cut, if not

done previously

Erection procedure String line rafter

ends Mark individually Cut plumb cut at end

Erection procedure After rafters are cut Fit eaves soffit

bearers Cut and fit timber or

metal facia

Erection procedure Cut and fit barge

boards Cut and fit metal

barge soaker if applicable

Timber fillet can be placed at end of barge to hide gutter

ReviewThree methods to finish…Flush gable – no eavesFlush gable – raked eavesBoxed gableOverhang also referred to as…..The verge overhangSupporting members…..Ridge, plates with possible stiffener and

purlins, depending on design

Review cont.

Extra member in boxed eave….

Bottom chord or tie piece

Three types of verge finishes…

Metal barge cap, barge tiles, tiles bedded

and pointed, patent verge finishes

Three types of eaves…

Open eaves, boxed eaves, raked eaves

Review cont.

Important clearance…

12mm between soffit bearer and brick

Review – erection procedure in dot form

Measure & cut ridge Mark rafter centres (allow any extra) Erect a pair of rafters at each end Plumb one end and temporary brace String line to ridge, check, fix remaining rafters Set out & fix purlins Cut & fix struts Cut & fix collar ties Fit permanent bracing Studs to gable ends Mark plumb cut and remove excess rafter length Complete eaves soffit, facia and soakers if applicable