GRP Gratings (Composite)

Rust-free, lightweight, load-bearing composite grating panels: six series from H13 to H60; 38×38, 19×19 / 38×38 and 50×50 mm meshes; four surface types.

Series: 6
Mesh types: 3
Panel sizes: 3

Get a Quote for GRP Gratings Series and panel sizes

Product conformity certificate FRP / GRP Gratings PDF

GRP Gratings

Series and panel sizes

Each series is defined by its mesh size, bar height (H) and bar thickness (T top, B bottom). Where a series comes in more than one panel size, every size is listed as an option.

GRP grating series (dimensions in mm)
SeriesMesh size	Height (H)	Top thickness (T)	Bottom thickness (B)	Open area%	Weight≈ kg/m²	Panel sizesmm	Load table	Request a quote
H1350 × 50	13	6.0	5.0	Not specified	Not specified	1000 × 4040	Not in table	Request a quote
H2538 × 38	25	6.5	5.0	68	12.5	1000 × 4040	Load values	Request a quote
H3019 × 19 / 38 × 38Mini mesh	30	6.5	5.0	42	18.5	1000 × 4040	Not in table	Request a quote
H3038 × 38	30	6.5	5.0	68	14	1000 × 4040	Load values	Request a quote
H3838 × 38	38	6.5	5.0	68	18.5	1000 × 4040 1220 × 3660 1000 × 3000	Load values	Request a quote
H3819 × 19 / 38 × 38Mini mesh	38	6.5	5.0	44	21	1000 × 4040	Load values	Request a quote
H5038 × 38	50	11.0	8.0	74	36	1000 × 4040	Load values	Request a quote
H6038 × 38	60	11.0	8.5	Not specified	Not specified	1000 × 4040	Not in table	Request a quote

—Not specified for that series; contact us for details.

All dimensions in mm. Weights (kg/m²) are approximate.

Mesh plan and bar section

Mesh types are shown in plan and the bar in section. The letters H, T and B match the columns of the series table; the values are in the table.

Mesh plan

50 × 50
- H13
38 × 38
Standard mesh
- H25
- H30
- H38
- H50
- H60
19 × 19 / 38 × 38
Mini mesh
- H30
- H38

Mesh pitch
Main mesh
Secondary mesh

In the mini mesh, 19×19 mm secondary openings sit inside the 38×38 mm main mesh.

Bar section

H38 bar section (example)

Series heights

Heights are drawn to the same proportion; bar thicknesses are in the series table.

H: Height
T: Top thickness
B: Bottom thickness

Product: GRP Gratings
Size: Example: H38 · T 6.5 / B 5.0 mm
Unit: mm
Scale: Not to scale

Four surface types

The standard surface of GRP gratings is concave. Depending on the need and the point of use, they can be supplied with a sanded, smooth or covered surface, in different sizes and colours.

Concave surface
Standard
The standard surface type for GRP gratings. The top of the bar section is concave; it suits many environments, including wet and oily conditions.
Sanded surface
Preferred where extra slip resistance is needed. It is made by coating a concave or smooth grating with binder resin and sand, and its slip resistance is higher.
It is harder to clean where oily substances are used.
Smooth surface
The concave surface is machined flat and smooth; the covered type adds a flat composite plate on top of the smooth grating. It is mostly used for decoration: façade railings, cover panels and architectural applications.
Covered chequered-plate surface
The top of a smooth-surface standard-mesh or mini-mesh grating is combined with a chequered-plate-effect surface.

Load values by support span

Point (F) and distributed (q) load values for five grating types at seven support spans. The ultimate load is given for each span as a multiple of F or q.

Span (mm)

300
450
600
750
900
1000
1200

Point load F (kg)
Span (mm)Ultimate load	H2538 × 38	H3038 × 38	H3838 × 38	H5038 × 38	H3819 × 19 / 38 × 38
300Ultimate load: 2 × F	1,000	1,700	3,510	13,400	3,570
450Ultimate load: 3 × F	450	750	1,500	5,950	1,570
600Ultimate load: 4 × F	255	425	875	3,325	880
750Ultimate load: 5 × F	150	270	550	2,100	564
900Ultimate load: 6 × F	105	190	380	1,475	391
1000Ultimate load: 7 × F	85	150	305	1,190	316
1200Ultimate load: 8 × F	60	101	219	829	219

Distributed load q (kg/m²)
Span (mm)Ultimate load	H2538 × 38	H3038 × 38	H3838 × 38	H5038 × 38	H3819 × 19 / 38 × 38
300Ultimate load: 3 × q	5,190	9,250	18,500	71,850	19,040
450Ultimate load: 4 × q	1,550	2,700	5,450	21,150	5,600
600Ultimate load: 5 × q	655	1,160	2,325	8,800	2,350
750Ultimate load: 7 × q	345	580	1,180	4,500	1,200
900Ultimate load: 8 × q	197	341	680	2,630	695
1000Ultimate load: 9 × q	140	240	500	1,915	505
1200Ultimate load: 10 × q	80	140	295	1,100	290

The table has no values for the H13, H30 (19×19 / 38×38) and H60 series.

Span: the distance between two supports (mm).
Point load F: a load acting at a single point (kg).
Distributed load q: a load spread evenly over the surface (kg/m²).
Ultimate load: given as a multiple of F or q depending on the span; for example 2 × F and 3 × q at a 300 mm span.

The values are a reference for comparing series and do not replace a project calculation. For the loads, spans and support conditions of your application, contact us.

Features and uses

What is GRP grating?

Glass-fiber reinforced plastic (GRP) gratings are composite products made by combining resin with a fiberglass matrix. They are structural elements that carry loads across spans and are used for walkways and elevated platforms. Unlike steel gratings they do not corrode, which lowers maintenance costs in corrosive environments.

Advantages of GRP grating

Corrosion-resistant
Does not rust like steel grating; used in corrosive environments with moisture, chemicals or salt water.
Light and strong
A high strength-to-weight ratio makes it easy to carry and install.
Bidirectional strength
The mesh of perpendicular bars carries load in both directions.
Slip-resistant surface
The standard concave surface suits wet and oily conditions; a sanded surface can be chosen for extra slip resistance.
Impact-resistant
The composite structure resists impact.
Non-conductive
Being electrically non-conductive is an advantage in electrical installations that need an insulating floor.
Low maintenance, long service life
Because it does not rust, it needs little maintenance and stays in service for a long time.
Wide choice
Available in a range of mesh sizes, heights, panel sizes, surface types and colors.

Applications

Industrial facilities: Walkways, platforms and stair landings in chemical and process plants.
Treatment plants: Walkways, platforms and covers over basins and channels.
Marinas, ports and shipyards: Piers and walkways in salt-water environments, and shipbuilding applications.
Energy and electrical facilities: Power plants, cooling towers and transformer areas that need an insulating floor.
Infrastructure: Storm-water gratings, drainage channel covers and pedestrian paths.
Architecture: Façade railings, cover panels and decorative applications with smooth-surface grating.