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 Good molding ability, crisp detail possible;
Weather resistant;
Can be painted or left uncoated;
Little shrinkage during fabrication;
Molds made directly from historic features;
Cements generally breathable;
Material is fire-rated.
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Disadvantages.
Non-loadbearing use only:
Generally requires separate anchorage system;
Large panels must be reinforced:
Color additives may fade with sunlight;
Joints must be properly detailed;
May have different absorption rate than adjacent
historic material.
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Checklist.
Are the original materials and craftsmanship still
available?
Have samples been inspected on the site to ensure
detail/texture match?
Has anchorage system been properly designed?
Have performance standards been developed?
Are fabricators/installers experienced?
4.17.5 Fiber Reinforced Polymer (FRP) Attributes.
Material. Fiberglass is the best known of FRP products.
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It is usually produced as a thin rigid laminate shell
formed by pouring a polyester or epoxy resin gel coat into
a mold. When tack-free, layers of chopped glass or glass
fabric are added with additional resins. Reinforcing rods
and struts can be added if necessary. Gel coat can be
pigmented or painted.
Uses. FRP is used where a lightweight replacement element
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is needed or where an inaccessible location makes frequent
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