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Re: Concrete Hip Roofs

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>Date: Sat, 15 Aug 1998 12:14:08 -1000
>From: "Baldridge & Associates Structural Engineering, Inc."
> <base.engr(--nospam--at)>
>Subject: Re: Concrete Hip Roofs
>To: seaint(--nospam--at)
>Does anyone know of a (relatively) simple way to build an 
>architecturally appealing (4:12 slopes, hips valleys etc) out of 
>concrete.  We can't use steel beams or decks, precast is possible but 
>would be difficult at the hips and valley, cast in place would work but 
>would be expensive to form.
>Any ideas?

Take the next flight to Spain and see how they do it beautifully. They 
use precast joists (similar to the prestressed keystone joists here), 
with brick (clay) left-in-place formwork. You can use wood for formwork 

In Cuba (the Republic) and Venezuela I saw different systems. The cuban 
one was to form with plywood.  The one in Venezuela is similar to the 
one in Spain but the joist is cast in place and the soffit comes 
prestressed with a steel "truss" for reinforcing and top steel and 
structural capacity prior to pour. You have to see it!

Good luck.

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