38mm GRP Riser Grating
38mm thick GRP riser grating is widely specified for standard service riser void installations where a balance of load capacity, slip resistance, and handling efficiency is required. As a moulded GRP mesh panel, it offers corrosion resistance, long-term durability, and the ability to be cut on-site to accommodate mechanical and electrical (M&E) service penetrations.
This thickness is commonly selected for commercial and residential multi-storey buildings where riser access may be required during installation and ongoing maintenance.
Mesh Configuration
31x38mm moulded mesh spacing (nominal)
This mesh configuration provides safe access while allowing effective drainage and ventilation within service riser void environments.
Typical Uses for 38mm GRP Riser Grating
- Standard commercial service riser voids
- Multi-storey residential riser applications
- Installations requiring a balance between structural span capability and manageable panel weight
- Projects with moderate access frequency during installation and maintenance
38mm vs 25mm and 50mm (When to Specify)
38mm panels are typically specified as the standard riser grating thickness where loading requirements exceed light-duty use but do not justify heavy-duty 50mm panels.
For smaller riser voids with limited access and shorter spans, 25mm panels may be appropriate. For larger spans, increased structural demands, or higher access frequency, 50mm thickness is typically recommended.
Technical Performance Characteristics of 38mm GRP Mesh
The following material properties apply to standard 38mm thick moulded GRP mesh panels used in service riser installations.
- Voltage breakdown: 18 kV/mm (ASTM D149)
- Density (specific gravity): 2100 kg/m³
- Thermal expansion factor: 13 × 10⁻⁶ mm/mm
- Water absorption: 0.45% over 24 hours (ASTM D570)
- Operating temperature range: -100°C to +200°C
- Flammability resistance: Class 2
- Frost resistance: No effect (DD CEN/TS 772-22:2006)
- Weatherability: Pass (MOAT 22)
- Slip resistance: 1.04 CoF (BS 4592-0)
Frequently Asked Questions About 38mm GRP Riser Grating
38mm GRP riser grating is typically specified as the standard thickness for service riser void installations. It provides a balance between structural span capability, slip resistance, and manageable panel weight, making it suitable for most commercial and residential multi-storey buildings.
Yes. 38mm panels offer increased structural depth and load capacity compared to 25mm thickness, making them more suitable for installations where spans are longer or access frequency is higher.
50mm thickness is typically specified where greater load capacity or larger unsupported spans are required. 38mm is commonly used for standard riser installations that do not demand heavy-duty performance.
Yes. Like other moulded GRP mesh panels, 38mm riser grating can be cut using appropriate tools to accommodate mechanical and electrical (M&E) service penetrations without compromising corrosion resistance.
Yes. 38mm moulded GRP panels are designed for long-term use within service riser voids and provide corrosion resistance, slip resistance, and durability for the lifetime of the building when properly installed.
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