Selection criteria for gratings

feature	Welded press grating (SP)	Press grate (P)	Insert grate (EP)
Basic principle	Load-bearing bars and crossbars are welded together at each node.	Crossbars are pressed into the load-bearing bars (without welding).	The load-bearing and crossbars are slotted and inserted into each other (positive locking).
Connection of the rods	Fabric-bonded (welded seam)	Form-fit through pressing	Form-fit connection via slotted joint
Crossbars	Mostly rectangular	Usually slotted	Slotted , interlocking
Edge bars	Available around the perimeter	Available around the perimeter	Available around the perimeter
Stiffness	Very high	High	Medium to high
Torsional strength	Very good	Good	Good
Vibration behavior	Small amount	Medium	Medium
Corrosion protection after manufacturing	Easily controllable	Very good (no weld points in the grid)	Good
optics	"Technical", weld points visible	Clean raster image	Very uniform grid
Manufacturing costs	Tendency higher	Medium	Medium
dimensional accuracy	Very precise	Very precise	Precise
Repairability	Easily repairable	Restricted	Restricted
Typical use	Industry, heavy loads	Architecture + Industry	Facades, sun protection, lightweight constructions

Essential planning and selection criteria for gratings

When selecting the appropriate grating, in addition to the grating type , the load-bearing capacity, deflection, and fastening must be taken into account. The chosen grating must reliably and permanently meet the specific operating conditions.

The following points should be noted in particular:

• Types of stress:
• uniformly distributed surface loads (min. 2.0 kN/m²),
• stationary or rolling point loads (min. 1.5 kN on 200 × 200 mm),
• Static and dynamic loads (e.g., from people or vehicles).
• Load capacity:
• Selection based on manufacturer's load tables,
• Consideration of span, material and safety factors,
• Static calculations may need to be performed by a specialist engineer in special cases.
• Deflection:
• The elastic deflection should generally not exceed L/200 .
• At joints, the height difference to adjacent grates must not exceed 4 mm .
• Fastening and support:
• secure and permanent anchoring to the substructure,
• possibly additional supports or reinforced edge connections,
• Adjacent grates are connected by butt joints or double clamps.
• Operating conditions:
• Slip resistance,
• Corrosion protection,
• Temperature resistance
• Weather conditions and aggressive media.

Essential planning and selection criteria for gratings

1. Clarify the load – consider area loads, point loads and static/dynamic loads.
2. Select load-bearing capacity – based on manufacturer's tables (material, span, safety factors).
3. Limit deflection – id R. max. L/200 , impact height difference ≤ 4 mm .
4. Secure fastening – permanent anchoring to the substructure, possibly with additional supports.
5. Secure rust connections – use butt joints or double clamps.
6. Consider operating conditions – slip resistance, corrosion, temperature, weather/media.