GRP manhole cover 50 mm square, drive-over, custom-made, closed, watertight, non-slip, shaft cover, sewer cover, inspection chamber, steel alternative

FRP molded grating closed height 50 mm

500 x 500 x 50 mm

€91,00

FRP molded grating closed height 50 mm

€91,00

incl. VAT

In stock

Load capacity: ●●●●● (industrial, high surface loads)

Span: ●●●○○ (For normal light wells & platforms)

Slip resistance: ●●●●○ (Secure industrial standard)

Size 500 x 500 x 50 mm 1000 x 500 x 50 mm 1200 x 600 x 50 mm 1000 x 1000 x 50 mm S - Custom cut up to 1000 x 1000 mm M - Custom cut up to 1900 x 600 mm L-cut up to 3007 x 1007 mm Pattern

SHIPPING & DELIVERY	DE & AT	EU
Delivery time	2–4 business days	4–7 business days
Shipping costs	7.90 €	19.90 €

Request individual project & quantity

Height 50 mm – The closed covering solution for heavy loads

For demanding covering tasks with increased load requirements, our 38 mm high GRP closed grating offers high load-bearing capacity with a completely closed surface.

The gritted top surface reliably protects against the ingress of dirt, water, and foliage, while the robust GRP construction also withstands increased stress. Ideal for manhole covers, sewer covers, inspection openings, and commercial areas where a flush, resilient, and permanently maintenance-free covering solution is required.

Installation note: The specifications apply to pedestrian-accessible covers with load-bearing support on all sides for standard manhole dimensions. Larger unsupported spans as well as areas subject to vehicle traffic are project-dependent and must be checked in advance. We will design these cases for your project together with our structural engineering partner; please contact us before ordering. Planning and execution of the substructure are the responsibility of the user.

Technical data: GRP grating closed 38 mm

Material	Glass-fiber reinforced plastic (GRP)
Height	50 mm
Surface	Closed & Quartz sand grit (slip-resistant)
Underside	Open grating profile, clear mesh width ~31 x 31 mm mesh (hollow chambers)
Area of application	Manhole covers, sewer covers, inspection openings, commercial areas
Protective function	Closed against dirt, water & foliage
Load capacity	Passenger cars & light forklifts
Edges	Closed edge meshes*
Dimensional tolerance (manufacturing)	± 3 mm

*Note on standard dimensions: Our standard formats are manufactured with closed edge meshes; the exact dimension may deviate slightly from the nominal dimension. Custom cuts are manufactured to the millimeter with open meshes; all cut edges are subsequently sealed.

Inquire about individual projects & quantities ➔

Chemical Industry

Electrical Installations

Offshore

Coastal Facilities

Swimming Pools

Plant Engineering

Workshop

Infrastructure

Renovation

Landscaping

GRP MATERIAL COMPARISON

	GRP	Galvanized Steel	Stainless Steel	Aluminium
Corrosion resistance	No issue	Only while zinc coating intact	No issue	Oxidizes without coating
Saltwater & aggressive media	Highly suitable	Corrodes quickly	Yes, but significantly costlier	Conditionally suitable
Weight	Light – only 1/3 of steel	Heavy	Heavy	Light
Electrically insulating	Yes	No	No	No
Maintenance effort	None	Regular re-galvanizing required	Low	Low
Total cost (TCO)	Low cost over lifetime	Low upfront, high operating cost	High acquisition cost	Medium

No action required Depends on application Clear disadvantage

Opt for the Smart Alternative to Steel

formavit® fiberglass reinforced plastic products are inherently corrosion-resistant, extremely weather- and chemical-resistant, and electrically insulating.

This means for you: easier handling during assembly and a completely maintenance-free end result – whether in heavy industry or for a private construction project.

Manufacturing & Cutting in South Hesse

Custom-fit GRP solutions from South Hesse - manufactured, tested, ready for dispatch.

Cutting and processing are carried out on-site according to clear standards. This ensures you receive clean edges, reliable dimensions, and predictable delivery times.

Frequently Asked Questions

To make your selection as easy as possible, we have categorized our GRP gratings for you according to typical areas of application:

13 mm to 25 mm (For light loads & pedestrians):
Perfect for private areas or as a non-slip covering on existing, solid floors.
Typical projects: Balcony floors, walkways by garden ponds, simple light shaft covers, or renovating slippery paths.
30 mm to 38 mm (The all-rounder for commercial, construction & industrial use):
Our absolute standard and bestseller. Choose these heights when the grating is installed self-supporting (i.e., only resting on the edges) and needs to withstand a lot.
Typical projects: Stair treads, platforms, work platforms, car washes, or paths that are occasionally driven on by a hand pallet truck.
50 mm and more (The heavy-duty class):
When things get serious. These gratings offer maximum stability and hardly bend even with very large spans and extreme weights.
Typical projects: Driveways for cars, trucks, or forklifts, as well as large industrial facilities with wide support distances.

Tip: How much a grating can withstand depends not only on its height but also on how far apart the support points of your substructure (the span) are. If you are unsure, simply use our contact form or request a personalized quote – we will be happy to advise you on your project!

For open gratings, it is best to use our special stainless steel grating clamps (V2A/V4A). These grip perfectly into the 38x38 mm mesh and fix the grating rust-free and storm-proof to the substructure.

If you want to install our closed GRP floor plates or stair treads, we recommend our weather-resistant 2K epoxy adhesive for a bomb-proof hold without drilling – alternatively, these can also be conventionally screwed.

Yes, absolutely! Glass-reinforced plastic (GRP) can be worked with similarly to hardwood.

For on-site adjustments, a standard angle grinder with a diamond cutting disc or a jigsaw with a carbide blade is sufficient.

If you want to save yourself the work on the construction site: simply use our individual cutting service directly from South Hesse! We deliver all gratings and plates ready for installation.

We produce your custom cuts at our location in Southern Hesse using state-of-the-art special saws (diamond cutting discs) to ensure particularly clean cut edges.

General Tolerance: We work with millimeter precision and a very small, industry-standard tolerance of +/- 2 to 3 mm.
Special Feature for Gratings: When planning, please note that for custom cuts, we often have to cut "freely" through the grating (so-called open edges) to achieve your exact desired dimensions. If your project absolutely requires a "mesh-accurate" separation (closed bars all around), please briefly indicate this in your individual inquiry. We will then plan the cut accordingly for you.

To ensure your GRP products arrive quickly and undamaged, we select the optimal and most cost-effective shipping method for you based on size and weight:

Parcel & Bulky Goods Shipping: Smaller cut-offs, plates, and standard gratings are shipped securely packaged as insured parcels (or bulky goods for lengths of 1,200 mm or more).
Freight Shipping (Palletized Goods): For large quantities, heavy individual items, or complex large-scale projects, we deliver your goods securely strapped to a pallet via freight forwarder.

Important for your planning: For freight deliveries, our logistics partner usually notifies you of the delivery in advance via email or phone. This allows you to perfectly plan for goods receipt at your delivery address or construction site.