GRC, Fibreglass or Cast Resin: Choosing a Relief Material
A straight comparison of weight, weather resistance, fire behaviour, detail resolution and repair for exterior and interior relief work.
1. GRC: the exterior default
Glass-reinforced concrete gives a genuine mineral surface, good weather resistance and non-combustible behaviour. It is heavier and needs engineered fixing, but for facades and public exteriors it is usually the right answer.
2. Fibreglass: light and large
FRP is light, can span large shapes and is easy to install on structures with limited load capacity. It needs a UV-stable gelcoat and a fire-performance specification appropriate to the venue.
3. Cast resin: fine detail indoors
Resin captures the sharpest detail and suits small runs, replicas and intricate interior pieces. It is not a default exterior material without a tested coating system.
4. Gypsum / GRG: interior only
The best choice for fine classical detail in dry interiors, and the easiest to repair. It should not be specified for humid or exterior conditions.
5. How we decide
We start from the environment and the fixing substrate, then shortlist two materials with samples. The final choice is made on a sample panel, not a datasheet.
Every project ships with shop drawings, a numbered crate list and a maintenance note. If your brief needs a different document set, tell us at enquiry stage.
Related reading
- How to Import a Custom Sculpture from China: A Practical Checklist
- Relief Wall Art Cost Guide: What Actually Moves the Number
- Packaging and Shipping Fragile Artwork Overseas
- Incoterms for Art Projects: FOB, CIF or DAP
- Installing Large Relief Panels: A Site-Ready Sequence
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