
Gelcoat RV Fiberglass Siding
Using GRP(fiberglass reinforced plastic) as siding for RVs has become a trend in the RV building industry because of its lightweight, durable and aesthetic properties. RV fiberglass siding builds up the body along with other insulating core materials,providing users with a comfortable living space.
Multiple Excellent Performance in One
GRP is strong but lightweight, which can greatly reduce the weight of the RV.
GRP can withstand great forces without breaking, making it durable.
GRP basically does not absorb water and is not easy to adhere to water, so the interior of the RV can maintain a dry environment even in rainy and snowy weather.
GRP is highly resistant to various chemicals and environmental factors, including moisture, salt water and various solvents, making the RV suitable for harsh environments.
GRP is an excellent electrical insulator, which can reduce circuit safety issues such as leakage and short circuits in RVs.
GRP is not easy to rust, corrode or degrade, reducing the need for regular maintenance and repairs.
The thermal conductivity of GRP is very low, which can reduce heat transfer, making it far better than any metal material in thermal insulation.
Specification of RV Fiberglass Siding
Fiberglass Content | 20~60%. |
Resin Type | Unsaturated polyester, epoxy resin, etc. |
Thickness | 0.7~5.0mm. |
Width | Max 3.2m. |
Length | 100~400m/roll. |
Surface Treatment | Glossy/Matt. |
Surface Color | RAL series. |
Density | 1.5~2.0g/cm³ |
Flame Retardant | B2. |
Water Absorption | <0.1%. |
Thermal Conductivity | 0.25~0.35W/(m·K). |
Operating Temperature | -40°C ~100°C. |
Thickness and Performance (Reference)
Item | 1.0mm | 1.5mm | 2.0mm | 2.5mm | 3.0mm |
---|---|---|---|---|---|
Weight(Kg/m2) | 1.5 | 2.25 | 3 | 3.75 | 4.5 |
Glass content(%) | 19 | 25 | 29 | 30 | 30 |
Tensile strength (Mpa) | 60 | 80 | 92 | 95 | 97 |
Elongation at break (%) | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
Elastic modulus (Gpa) | 5.5 | 7 | 7.3 | 7.6 | 7.8 |
Izod impact strength (KJ/m2) | 45 | 55 | 70 | 80 | 95 |
Analysis of RV Fiberglass Siding
RV fiberglass siding is made of thermosetting resin (unsaturated polyester, epoxy, etc.) and fiberglass felt or fiberglass woven cloth in a certain proportion. A layer of gel coat is applied on its surface for protection and decoration.
Fiberglass Resin Mixed Layer
Different types of resin and fiberglass combinations, as well as different fiberglass to resin ratios, are important factors that affect the performance of RV siding.
Gelcoat Layer
Gel coat is a special coating material applied to the surface of fiberglass reinforced plastics, mainly used to provide a smooth appearance and protect the base composite material from environmental factors.
Non-woven Fabric Layer
Non-woven fabric can make the adhesive more evenly distributed, reduce waste, and make the glass fiber sheet and other core materials more firmly bonded together.

Felt Matrix Fiberglass Siding
- Advantages: 01.The surface is flat and smooth. 02. Not easy to deform.

Cloth Matrix Fiberglass Siding
- Advantages: 01.Excellent compressive and tensile strength. 02.Lighter and thinner.
How to Improve the Performance of RV Fiberglass Siding
Anti-ultraviolet
Add anti-aging agents to improve the weather resistance of RV siding.
Flame Retardant
Add high-performance flame retardants to improve the fire resistance of the RV siding.
Reinforcement Treatment
Add silica, calcium carbonate, etc. to enhance the mechanical properties and wear resistance of the siding.
Surface Treatment
The fiberglass siding for RVs can be presented in different colors and patterns. Users can choose their own style in the RAL color series, and there are a variety of textures for reference. Of course, you can also provide the designed pattern texture for us to complete the final production.




Fiberglass Siding vs Aluminum Siding
When it comes to choosing an RV siding material, both fiberglass and aluminum have their own pros and cons. Here’s a detailed comparison of the two, analyzing multiple aspects to help you make the best choice.
Item | Fiberglass Siding | Aluminum Siding |
---|---|---|
Durability | Good | Very good |
Thermal insulation performance | Good | Poor |
Maintenance costs | Low | Low |
Weather resistance | Good | Good |
Weight | Lighweight | Lighweight |
Installation Difficulty | Easy | Difficult |
cost | Low | High |
Flame retardant | General | Excellent |
Recyclability | Low | High |
Our Customization Service
- Customized width, thickness, color, texture of RV fiberglass siding.
- Customized fiberglass sandwich panels for RVs.


Quality Commitment
- No fading in long-term exposure to the sun.
- No mildew in long-term humid environment.
- Maintains performance in extreme high and low temperatures.


Fiberglass Sandwich Panels for RVs
Fiberglass sheets and core materials (foam, plywood, honeycomb panels) are composited with adhesives to form RV body panels that meet design requirements.
Cooperation Cases
No matter what style of RV your project is, you can find the right siding material with us.



