Graphical Construction Glossary >> Roofs and roofing. >> Roof Framing >> sprocket-piece

1.) A piece at the foot of a rafter to incline last section of the roof towards the horizontal, to make sprocketed eaves.
2.) An outrigger piece attached to the end rafters at the verge of a gable roof to create a gable overhang.

section through mansard roof
A section through a mansard roof.

In this instance the sprockets are fixed to the steep rafters of a mansard. Used here to make the roof clear the outer wall. They are more commonly used on less steep roof pitches. When quite large they are used for decorative effect to create a sprocketed eaves, and smaller ones are used to give a close fitting joint when slates or tiles are used.

sprocket at the gable
A sprocket at the verge of a gable wall.

These sprockets are set one under each roof batten and screwed from the top. Additionally they have the nailed plate connectors to the last pair of rafters. They either sit on the wall or are packed up from the wall.

Typically they create an overhang of 450 Max. (This is cyclonic framing construction, this is where I live and this is what I have done for the last 30 years. I make no apologies for overly strong details).

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"When we build, let us think that we build for ever."John Ruskin 1819-1900

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Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
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