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Cantilevered floor, wall, and roof of this building reduces load on the cantilevered wall and floor by using a roof beam (C) Daniel FriedmanCantilevered Roof Framing: support beam

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Cantilevered Roof Framing:

Roof beam support for a cathedral-ceiling low slope roof using cantilevering. Using a structural ridge beam to support part of a single-slope roof over a cantilevered building canti-levers a portion of the roof load and weight as well, reducing the load on the cantilevered outer wall and on the floor structure below it.

Our page top photo illustrates a cantilevered second-floor addition over a garage. Including a roof beam whose loads carry down to the building foundation permits a portion of the roof load to be carried as well, minimizing the effect of roof loads on the cantilevered wall and floor below.



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Using a Structural Beam with a CantiLevered Roof

Cantilevered roof & floor support (C) Daniel Friedman

Above: the vertical red box shows the approximate location of the end post, built into the building wall, supporting one end of the roof beam that supports the cantilevered roof (green lines) covering the second floor addition of this structure. Cantilevering the roof permitted a cathedral ceiling in the interior and reduced the roof's load on the cantilevered wall and floor below.

[Click to enlarge any image]

Below during framing of that structure we show the installation of the structural roof beam supported by posts and carrying the roof loads to the foundation and footings of this building addition the author, working with builder Eric Galow in Poughkeepsie, New York.

This article series describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings, including definitions of collar ties, rafter ties, and structural ridge beams.

Without the proper support of rafter ties or a structural ridge, a typical gable or sloped roof will sag downwards while pushing the building walls outwards towards a catastrophe.

We include sketches of collar ties, rafter ties, and structural ridge beams as well as illustrations of collapsing and collapsed structures where these roof rafter ties were lost or omitted.

Structural beam below a cantilevered low slope roof (C) Daniel Friedman

Here the upper 1/3 of this single-pitch low-slope roof extends out over a cantilevered portion of the building. The top plate of the side walls pass over the roof beam, as you can see in the photo above. Below we're building up the upper surface of the roof beam by gluing and nailing 2x lumber to bring the beam upper edge flush with the top of the wall top plate.

Building up the top surface of the roof beam to match gable end walls (C) Daniel Friedman Eric Galow

For rafters we're using OSB-webbed wooden I-trusses that pass over the roof support beam, cantilevering out the roof over the cantilevered floor.

Below the author [DF] is nailing very long steel structural strap ties that pass over the top of the I-truss, down its side, and down both the outer wall framing (at the roof truss ends), and down the face of the supporting roof beam as well.

D Friedman nailing strapping to tie roof I-trusses to the building wall and beam (C) Daniel Friedman

Inside the structure ...

Steel strapping ties the roof beam to the wood I-trusses above (C) Daniel Friedman

you can see the steel strapping that was carried from the top of the wood I-trusses down to be nailed to the supporting roof beam. The roof truss ends were similarly strapped to the building wall studs and top plates.
See CONNECTORS, FASTENERS, TIES

Below: workers installing trim and finish flooring in the canti-levered portion of this building.

Cantilevered construction, finish work (C) Daniel Friedman

Article Series Contents

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Continue reading at COMPRESSION BRACING for RAFTERS (Canada) or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see ROOF FRAMING TIES & BEAMS - home

Or see FRAMING DAMAGE, INSPECTION, REPAIR - home

Or see LVL Laminated Veneer Lumber, Beams

Or see STRUCTURAL INSPECTIONS & DEFECTS

Or see TRUSSES, FLOOR & ROOF

Or see TRUSS UPLIFT, ROOF causing interior ceiling & wall cracks

Or see WOOD STRUCTURE ASSESSMENT

Suggested citation for this web page

CANTILEVERED ROOF SUPPORT REQUIREMENTS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to BUILDING STRUCTURES

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