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4specs Discussion Forum » Archive - Product Discussions #3 » GFRG vs GFRP Fabrications « Previous Next »

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Anonymous
 
Posted on Wednesday, April 09, 2008 - 10:59 am:   Edit PostDelete PostPrint Post

When to use one or the other?
Advantages?
Disadvantages?
Cost?
Uh-ohs?

PS - GLASS FIBER REINFORCED GYPSUM vs GLASS FIBER REINFORCED PLASTIC
Dave Metzger
Senior Member
Username: davemetzger

Post Number: 266
Registered: 07-2001
Posted on Wednesday, April 09, 2008 - 11:56 am:   Edit PostDelete PostPrint Post

GFRG is for interior use only. GRFP can be used interior or exterior.

GFRG must be painted. GFRP can be integrally colored or painted.

Another option, in particular for exterior use (tho it also can be used interior) is glass fiber-reinforced concrete (GFRC). When I have specified this it has been integrally colored, tho I suppose it can be painted.
William C. Pegues, FCSI, CCS
Senior Member
Username: wpegues

Post Number: 718
Registered: 10-2002
Posted on Wednesday, April 09, 2008 - 05:20 pm:   Edit PostDelete PostPrint Post

I concur with Dave. Though, painting GFRP (plastic) can sometimes be 'iffy'. Adhesion can be a problem, and I strongly recommend adhesion tests prior to the spec being issued to assure the coating manufacturer is satisfied with the quality of the surface provided.

And on his suggestion that glass fiber-reinforced concrete can be painted, definitely so. We did a project some years ago where we used the wonderful 'Verceram" product which was a glass fiber-reinforced ceramic panel. Now we are doing a building adjacent to this where they want to continue the use of the same panel design (Verceram was discontinued). We rejected the use of fiberglass due to our problems coating it in the past. If it was just a color, that would be one thing, but this is required to match a Duranar metallic 2 coat system. So, we are using the PPG Coraflon product on the concrete panels for a perfecct match to the PPG Duranar product on the curtain wall components.

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