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HOW WIRE MESH DECKING LOAD CAPACITY IS DETERMINED
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Protect yourself from buying weak, uncertified material, or from overpaying for capacity you do not need.
This page provides the technical explanation of how wire mesh rack decking working loads are evaluated under the ANSI MH26.2 standard. If you need to verify how deflection limits (D/165) or structural collapse points are calculated to achieve a Rack Manufacturers Institute (RMI) R-Mark certification, the details below will confirm if this matches your technical requirements.
Understanding Wire Mesh Decking Load Ratings
When managing a safe and efficient warehouse, knowing the precise weight your storage racks can handle is critical. To maintain absolute safety and clear up any variations between different deck designs, J&L Wire utilizes the standard testing methods approved by the Rack Manufacturers Institute (RMI). We’re proud to provide U.S.-made products that are consistently reliable in a market where that’s hard to come by.
This rigorous evaluation follows the American National Standards Institute (ANSI) standard MH26.2, titled “Design, Testing and Utilization of Welded-Wire Rack Decking”.
- Applicability: This standard applies strictly to uniformly loaded rack decking fabricated from welded-wire mesh with permanently attached reinforcements, for use in storage racks.
- Exclusivity: There is no other approved test method recognized by RMI that rates a deck’s load capacity. Only manufacturers that can prove conformance to this standard are certified by RMI with an R-Mark.
In other words, anyone can stamp a weight capacity on a quote sheet, but only manufacturers who pass this specific, rigorous test can claim conformance and display the R-Mark.
How Capacity Ratings Are Calculated
Testing to the ANSI MH26.2 standard provides the rating capacity by selecting the lesser of either deflection (of the rack and channels) or total deck collapse.
The physical test involves placing the wire decking on support beams that match the deck’s depth. A load is then uniformly applied (typically via hydraulic cylinders providing loading at equal distances along the deck) while continuous measurements of deflection and load are taken.
The Two Critical Test Values:
- Deflection Limit (W1): Load is applied in a minimum of four increments up to the point at which a deflection of D/165
(D = deck depth) is achieved. This load is recorded as W1. - Structural Collapse Limit (W2): The test load is increased further until structural collapse occurs — the point at which the support channels continue to deflect without any additional loading — in a minimum of no less than four increments. This collapse load divided by two (2) is recorded as W2.
Final Rating Rule: Load capacity ratings are defined as the lesser of the two values (W1 or W2).
Example Calculation: 42″ Beam Depth
The following data illustrates the step-by-step testing procedure and calculations for a standard 42-inch deep deck:
| Test Parameter | Measurement / Calculation |
| Deck Depth (D) | 42″ |
| Maximum Allowed Deflection | D/165 = 42″ / 165 = 0.25″ |
| Applied Test Load to Deflection (W1) | 3,498 lbs |
| Applied Test Load to Structural Collapse | 7,500 lbs |
| Calculated Collapse Value (W2) | 7,500 / 2 = 3,750 lbs |
| RATED WORK LOAD CAPACITY | 3,498 lbs (The lesser of W1 and W2) |
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Request a Quote Rated for Your Specific Load Capacity
Need wire decking built to these exact technical standards? Contact our team today to receive a quote tailored to your specific warehouse racking dimensions and weight requirements.
Frequently Asked Questions About Wire Decking Load Capacities
What is the ANSI MH26.2 standard for welded-wire rack decking?
The ANSI MH26.2 standard is the American National Standard Institute’s official standard entitled “Design, Testing and Utilization of Welded-Wire Rack Decking”. This standard applies strictly to uniformly loaded rack decking fabricated from welded-wire mesh with permanently attached reinforcements, for use in storage racks.
How does RMI approve wire mesh deck load testing?
To determine the working load of a wire mesh deck, J&L uses the test method recognized and approved by the Rack Manufacturers Institute (RMI). Testing to the ANSI MH26.2 standard evaluates the rating capacity by taking the lesser of either the deflection of the rack and channels or total deck collapse. There is no other approved test method recognized by RMI to rate a deck’s load capacity.
What is the wire decking deflection capacity calculation formula?
Deflection capacity is calculated by applying a uniform load in a minimum of four increments until a maximum deflection of
D/165 is reached, where D represents the total deck depth. This specific weight is recorded as value W1. The final official working load rating is always defined as the lesser of this deflection value (W1) or half the structural collapse value (W2).
What are the Rack Manufacturers Institute R-Mark certification requirements?
To earn the RMI R-Mark certification, wire decking manufacturers must definitively prove strict conformance to the standardized testing procedures outlined in the ANSI MH26.2 standard.