Molded FRP Grating Mesh Geometry: A Drawing-Input Checklist

Reviewed by Yadong Wang, Technical Engineer · Published by QY Metal Tech

Square, rectangular and micro-mesh describe different FRP grating geometries, but the useful comparison is the actual top opening, lower grid and panel depth. A denser grid can change panel weight even when depth stays the same. Compare those dimensions with support direction, required openings and the selected product’s load data.

Same depth, different grid: a real weight comparison

The QY molded FRP reference weight chart lists these two 30 mm-deep examples from the approved parameter chart:

Catalog grid/depth (mm)	Reference weight
38 × 38 × 30	15 kg/m²
19 × 19 × 30	19.2 kg/m²

The second reference is 4.2 kg/m², or 28%, heavier at the same stated depth. Across 2 m², the reference net-panel difference is 8.4 kg. This is a comparison of the published rows, not the measured weight of a new batch or a load-capacity comparison.

The chart’s grid labels do not replace measured clear openings. Record rib width, top and bottom geometry and panel orientation before deciding whether a fine-grid or directional pattern meets the project’s needs. Use the Access Board’s floor-surface guidance only where those U.S. accessibility requirements apply, and assess the actual finished opening rather than the catalog label.

Keep the catalog label separate from measured geometry

Square, rectangular and micro-mesh are useful starting labels, but they do not describe every part of a molded panel. Supplier catalogs may use the same broad label for products with different top openings, bottom grids, panel depths or molded sections. Preserve the name shown on the drawing, sample tag or previous order as a source field, then record the geometry independently.

The molded FRP grating product page confirms QY's published molded-FRP scope and identifies mesh size as a quotation field. It does not state that every named grid family or competitor series is available.

Use a geometry table before naming the product

The following table organizes what to record. It is not a cross-reference or selection table.

Provisional label	Geometry to record	What the label does not prove
Square mesh	Top opening and center spacing in both directions; bottom grid; rib widths; panel depth	Equal strength, load, span, drainage or availability
Rectangular mesh	Long and short opening directions; center spacing; rib orientation; panel and support direction	Bearing direction, capacity, deflection or suitability
Micro-mesh or mini-mesh	Top opening pattern; bottom support grid; panel depth; transition between top and bottom geometry	One universal size, accessibility, slip resistance or compliance
Unknown molded grid	All measurable top, bottom, edge and section features plus photographs	Product name, resin, grade, tolerance or interchangeability

If a value is missing, mark it `QY to review`. Do not replace it with a value copied from a visually similar catalog panel.

Photograph the top, bottom, edge and cut section

Use a full-panel view plus close photographs of the top face, bottom face and an edge. Add a ruler or controlled scale where measurement is needed. Mark the two panel directions and identify the intended walking or exposed face. If a cut sample is available, photograph the section so the panel depth, top grid and lower grid can be distinguished.

The approved QY photograph used with this draft shows a real molded-FRP walkway and visible open grid. It does not establish the grid name, opening, center spacing, depth, resin, surface, load or support design for a new inquiry.

For a cut panel, add the finished outline, openings, notches, edge distances and panel marks. The FRP cutout and edge-trim guide covers that fabrication work in detail.

Draw grid direction against the support layout

The drawing should show panel length and width, the two grid directions, support lines, bearing width supplied by the project, openings, joints and the intended installation orientation. Do not infer a permitted span or load from the word square or rectangular. Capacity and deflection must be checked against the actual QY product record, panel section, support arrangement and project load basis.

Use the FRP load-table and support-span guide to keep load type, clear span, support width and deflection criteria with the correct product record. That link does not turn the present geometry checklist into structural approval.

Separate mesh geometry from resin and surface decisions

Mesh geometry does not define resin system, color, top surface, slip performance, chemical suitability, fire performance or UV behavior. Record the requested resin or exposure conditions as separate buyer inputs. Likewise, state whether the visible surface is concave, gritted, smooth or covered only when it is documented; do not quantify slip resistance from appearance.

Also keep clips, panel-to-panel joints, cut-edge sealing and installation responsibility separate from the mesh label. The purchaser or responsible designer must approve support design, loading, accessibility, opening limits, slip requirements and local code applicability.

Send one controlled mesh-geometry package

For quotation review, send the source label, top/bottom/edge photographs, opening and center spacing in both directions, panel depth, panel size, orientation, support layout, surface, resin or exposure request, cut drawing, quantity, packing and every unknown field. QY must confirm the applicable product terminology and availability case by case.

Send the controlled drawing-input package through the contact page. Do not ask QY to quote from the words micro-mesh, square mesh or rectangular mesh without the geometry and project inputs, and do not treat a third-party load table or certification as QY evidence.