FRP Covered-Top vs Open-Mesh Grating: Which RFQ Details Change?

FRP covered-top grating and open-mesh FRP grating should be quoted with different RFQ details. Buyers should confirm application, panel size, thickness, mesh size, top surface, resin or color request, support span, drainage or closed-surface requirement, cutouts, quantity, packing and drawings.

Answer summary: Open-mesh FRP grating is usually reviewed by mesh size, thickness, support span, surface and drainage needs. Covered-top FRP grating also needs the top plate or covered surface requirement, walking surface, edge treatment and cleaning or containment context. QY should not infer slip rating, load capacity or chemical suitability from the surface name alone.

Covered-top vs open-mesh FRP grating

RFQ point	Open-mesh FRP grating	Covered-top FRP grating	What buyers should confirm
Surface	Open grid surface	Covered or plated top surface	Concave, gritted, covered top or project wording
Drainage	Often used where liquid passes through	May reduce open drainage through the top	Drainage, containment or walking requirement
Cleaning	Open mesh can expose grid openings	Covered top may be selected for a flatter surface request	Cleaning method and site expectation
Panel review	Mesh, thickness and support span are key	Top surface and edge treatment also matter	Panel size, support span, edge and cutout notes
RFQ evidence	Size list or drawing	Drawing, surface note or previous sample is helpful	Photos, sketch, drawing or previous order reference

Why the surface request should be clear

FRP grating RFQs often use terms such as gritted, concave, covered top, solid top or molded grating. These terms should be checked against the buyer's drawing or application, because the quotation basis can change with top surface, panel size, resin request and cutting details.

For wet areas, wash bays, chemical plant platforms, trenches or maintenance walkways, buyers should describe whether liquid should pass through the panel, whether a flatter walking surface is requested, and whether edge trim or cutouts are needed.

For product context, see molded FRP grating, FRP anti-slip surface notes and FRP grating panel size and support span.

Specification details to confirm

Detail	Why it matters	What buyers should send
Application	Defines review context	Walkway, platform, trench cover, wash bay or maintenance access
Surface type	Defines quotation basis	Open mesh, covered top, gritted, concave or project wording
Panel size	Defines cutting and packing	Width, length, thickness, mesh size and quantity
Support span	Helps panel review	Clear span, frame detail, trench opening or support ledge
Resin or color	Affects quotation basis	Project resin wording, exposure note, color request or to-be-reviewed note
Drainage or containment	Helps surface selection	Whether liquid should pass through or be blocked by top surface
Cutouts and edge trim	Affects fabrication	Pipe cutouts, corner notches, sealed edge, trim or panel marks
Packing and destination	Needed for export review	Pallet, bundle, marks, loading note and destination

Key terms to clarify

• Open mesh: FRP grating with visible grid openings.
• Covered top: FRP grating with a covered or plated top surface request.
• Gritted surface: A surface request for walking discussion, not a guaranteed slip rating without project data.
• Support span: The clear distance between supports under the panel.

What to prepare before sending RFQ

For a faster FRP surface review, prepare:

• Application area and site condition.
• Required surface: open mesh, covered top, gritted or concave.
• Panel width, length, thickness and mesh size.
• Support span, frame detail or opening size.
• Drainage, containment or cleaning requirement.
• Resin or color request if specified.
• Cutouts, notches, edge trim and panel marks.
• Quantity, packing, destination and drawings.

RFQ checklist

Before sending an FRP covered-top or open-mesh grating RFQ, confirm:

• Application area.
• Surface type.
• Panel size and quantity.
• Thickness and mesh size.
• Support span.
• Resin or color request.
• Drainage or containment requirement.
• Cutouts and edge trim.
• Packing and destination.
• Drawings or photos.

Related QY pages

• Molded FRP grating for the main FRP grating product page.
• FRP anti-slip surface notes for surface request context.
• FRP grating panel size and support span for sizing details.
• FRP color and surface RFQ for color and top surface details.
• FRP chemical plant platform RFQ for application-led FRP review.
• Contact QY Metal Tech when panel drawings and surface details are ready.

FAQ

What is the RFQ difference between covered-top and open-mesh FRP grating?

Open-mesh FRP grating needs mesh size, thickness, support span and surface details. Covered-top FRP grating also needs the top surface requirement, edge treatment, cleaning or containment context and drawings.

Is covered-top FRP grating always better for walking areas?

Not always. The best surface depends on drainage, cleaning, support span, traffic, project standard and buyer requirements. QY should review the supplied details before quotation.

Can QY confirm slip rating from the surface name?

No. QY should not claim slip rating from terms such as gritted or covered top without confirmed test data, project requirements and buyer approval.

What drawings help with FRP surface selection?

Useful drawings show panel size, support span, opening size, surface note, cutouts, edge trim, drainage requirement and panel marks.