We've done several cornice restorations and heartily shy away from the use of fiberglass cladding, a material that is very susceptible to UV deterioration. So why aren't the fiberglass boats falling apart? Huh? well? Why? Because the likelihood that any cornice is going to receive the required attention and be repainted on a cyclical basis is very slim And who's going to paint the galvanized?  and metal, even galvanized, is going to be more durable than piece o'shit plastic. Yeah, but the fiberglass at least has some thickness built into it, which the micron-thick metal isn't going to have, especially where it's been stamped damn near through in order to get a decent profile. Most of the failures that we've seen are principally related to fastener corrosion - So use stainless fer Chrissakes.  Jeez, Louise. a result of inadequate metals separation and subsequent galvanic corrosion, and water infiltration into the cornice because no one wants to perform proper maintenance. So the maintenance is a wash either way.  In that case, take it outta the equation.
 
Also the crappy appearance of 3/4" sealant joints between pieces of plastic on cornices makes me want to puke.  Yeah, well, the pukey appearance of the joints makes me want to crap, but it's less apparent on higher buildings.
 
Twybil Ralph
 
 
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