Correctly fixing GRP grating panels is essential to ensure safety, stability and long-term performance. The most common and effective fixing methods use M clips and C clips, each serving a different purpose within a grating installation.
This guide explains how and when to use M clips and C clips, and how to fix GRP grating panels correctly.
What Are M Clips and C Clips?
-
M clips are used to secure GRP grating panels to the supporting structure.
-
C clips are used to join adjacent grating panels together.
Using both clip types correctly ensures panels are held firmly in place while allowing for slight movement due to temperature changes.
When to Use M Clips
M clips are the primary fixing method and should be used to:
-
Secure panels to steel, concrete or GRP supports
-
Prevent vertical movement or lift
-
Hold panels firmly at corners and edges
M clips sit over two load bars and fix down through the centre of the clip into the support below.
When to Use C Clips
C clips are used to:
-
Join two grating panels together
-
Maintain alignment between panels
-
Reduce panel movement along shared edges
C clips do not fix into the supporting structure; they clamp panels together along the joint.
Fixing Quantities (General Guidance)
As a general guide:
-
Use 4 M clips per square metre of grating
-
Additional M clips may be required at high-traffic edges
-
Use C clips along panel joints as needed
Exact quantities may vary depending on load requirements and site conditions.
Step-by-Step: Fixing GRP Grating Panels
Step 1: Position the Panels
Lay the GRP grating panels onto the supporting structure, ensuring:
-
Panels are square and level
-
Correct bearing support is provided
-
Panel joints align correctly
Step 2: Fit C Clips Between Panels
Where two panels meet:
-
Place a C clip over the adjoining load bars
-
Insert the fixing bolt and tighten
-
Ensure panels are drawn together evenly
This step keeps panels aligned before final fixing.
Step 3: Install M Clips
To secure panels:
-
Place the M clip over two load bars at the fixing point
-
Insert the bolt through the clip into the support below
-
Tighten until secure, but do not overtighten
Repeat this process around the panel perimeter and across the panel as required.
Step 4: Final Checks
Once all fixings are installed:
-
Check panels are secure with no rocking or lift
-
Ensure all bolts are tightened correctly
-
Confirm edges and joints are properly aligned
Tips for a Secure Installation
-
Always follow manufacturer spacing recommendations
-
Avoid overtightening, which can damage GRP
-
Use stainless steel fixings in corrosive environments
-
Ensure supports are level and correctly spaced
Why Correct Fixing Matters
Correctly installed fixings:
-
Prevent movement and noise
-
Improve safety underfoot
-
Extend the life of the grating
-
Ensure compliance with site safety requirements
Using the right combination of M clips and C clips is key to a professional and reliable GRP grating installation.
