Graphical Construction Glossary >> Roofs and roofing. >> Butterfly roof

Butterfly roof
A roof that could be called an inverted gable roof. Both surfaces slope inwards from the walls to a central valley.

a plastic roofed shade structure
A roof under construction. The roofing is a type of opaque plastic sheeting. Note that it is not fixed directly with screws but the sheeting is held down via over battens that are fixed through it into the RHS purlins.
Note also that the roof is cantilevered out from a set of central columns and beams.

a butterfly roof
Both roof faces fall inwards into a central valley.

I have seen a few of these on service station forecourts and the like, and the principal is the maximum amount of cover, but with only one point for a downpipe. Little need for any other rainwater control.

In a similar vein these roof forms are used a lot in older adjoining inner city properties where fire regulations etc. dictate the use of party or firewalls between occupancies. In this case one central valley gutter with one downpipe is better than one at either side.

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Adam Smith 1723-1790

"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  It could be out of date!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!
You must check your own local conditions.
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