Roof Truss Gable Ladder

Gable end overhangs constructed using the ladder detail.

Roof truss gable ladder.

Is equal to twice the design truss spacing less. Simplified gable framing with trusses is possible with a ladder panel designed by the small homes council. Cut a number of 2 by 4 plank supports the width you would like the truss to be minus 3 inches to allow for the two lengthwise 2 by 4s. 2x4 ladders with one dropped gable truss are applicable for overhangs up to 2 ft.

If a truss roof is used with this method the gable truss is manufactured 3 shorter than the others. If the gable end ov erhang uses the ladder detail method of construction and the length of the ov erhang is greater than 8 inches to 12 inches you may be able to strengthen the connection of the ov erhang by installing from the attic inch diameter lag screws that are long enough to go through the gable truss or rafter through the wall sheathing and 1 1 2 inches into the inside framing member of the ladder framing. The picture above shows the plan view of a gable roof. I then build up a ladder of 2x4 s on the ground after decking the roof.

I turn my first layer of decking so that the crown is down forcing the lower end up. I nail the ladder to the decking and to the gable end truss. Except for tack on ladders have the ladder framing extend into the roof a distance at least equal to the overhang. 2x6 ladders with one dropped gable truss and one dropped truss are applicable for overhangs up to 3 ft.

Step 4 lay the two truss brackets from step 2 on the ground parallel to each other. The top chord of the gable is dropped so that the framer can run a series of outlookers or ladders from the fascia back to the first common truss. Gable ladders to be fixed directly to last truss with wallplate may be extended over the gable ladder width for added support if required bargeboards and soffits to be nailed directly to the gable ladder jack rafter 25mm deeper than trussed rafter and birdmouthed over wallplate d max. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used to support the roof sheathing.

Gable trusses are more expensive than common structural trusses because more lumber is required. A gable truss isn t structural and needs a continuous bearing support underneath such as a beam or wall. Ladder trusses are made up using four noggins bridging at each corner to support a rafter outside the building. Then a 2 4 outlooker is placed over the dropped gable and butted into the side of the adjacent full height truss.

Although the panels were designed for use with single plane roof trusses they can be adapted to conventional. Although i hate building a truss roof sometimes it is called for. Then the barge or fly rafter is attached to the end of the cantilevered outlooker. That rafter outside forms the overhang for the barge boards to fix to and so the soffit boards and ventilation are continuous all the way around the structure.