Perforated Metal Sheet in Singapore: A Buyer's Guide
Perforated metal sheet is one of the most widely specified architectural and industrial materials in Singapore — used across facades, ceilings, acoustic panels, screens, drainage covers, and fitout elements, from Grade-A commercial towers to HDB estate upgrading works. This guide covers hole patterns, open area, material grades, finishes, and standard vs custom supply.
What Is Perforated Metal Sheet?
Perforated metal is produced by punching a regular pattern of holes through a flat metal sheet using a punch press and die. Unlike expanded metal, which is slit and stretched into a three-dimensional diamond mesh, perforated sheet remains flat after processing, giving precise control over hole geometry, size, pitch, and open area percentage.
Hole Patterns
The standard specification for most architectural and acoustic applications in Singapore. Staggered rows maximise open area for a given hole size and produce an even visual texture. The default choice unless a specific visual or structural requirement dictates otherwise.
Round Holes on 90-Degree Pitch
Lower open area than staggered for the same hole size. Used where a grid-aligned, ordered visual is required rather than maximum airflow.
Square Holes
A more geometric, rectilinear pattern common in contemporary commercial and retail interiors. Produces a cleaner, more structured appearance than round hole patterns.
Slotted Holes
Elongated apertures in horizontal, vertical, or staggered arrangements. Used for directional screening, louvre-effect panels, and applications where drainage in a specific direction is needed. Supply Bay supplied horizontal staggered slotted perforated metal at JTC CleanTech 3 for green wall substrate and facade screening.
Custom and Laser-Cut Patterns
Any geometry can be produced via CNC laser cutting. Used for design-led facade panels, decorative screens, retail fitout elements, and bespoke ceiling panels.
See our laser cutting service →
Open Area Percentage
Open area — the percentage of the panel surface that is perforated — is one of the most critical specification parameters. It affects:
Ventilation and airflow through the panel
Acoustic performance when used with a backing layer
Visual transparency and light transmission
Structural integrity — higher open area reduces the panel's residual section
As a general guide for common applications:
| Application | Recommended Open Area |
|---|---|
| Acoustic ceilings | 20–35% |
| Facade screening and solar shading | 30–50% |
| Ventilation panels and bin centre enclosures | 40–60% |
| Decorative interior screens | 25–45% |
| Drain covers and grating | 40–55% |
| Green walls | 40–50% |
Material Grades
| Grade | Properties | Typical Singapore Application |
|---|---|---|
| Mild steel | Most cost-effective; requires coating for any outdoor or humid use | Sheltered interior and industrial, with galvanising or powder coat |
| Galvanised steel (GI) | Zinc-coated mild steel; standard for outdoor industrial and infrastructure | Bin centres, drainage, estate infrastructure |
| Aluminium | Lightweight, naturally corrosion-resistant, accepts powder coat and PVDF | Facade panels, ceiling systems, weight-constrained applications |
| SS304 stainless steel | Standard architectural grade; inherent corrosion resistance without additional coating | Interior and semi-sheltered exterior, inland locations |
| SS316 stainless steel | Adds molybdenum for significantly stronger chloride resistance | Coastal locations, waterfront, food processing, chemical exposure |
Tip
If you are considering using stainless steel perforated metal, forprojects within approximately 5km of the coast or at waterfront locations, SS316 is the correct specification. SS304 is generally sufficient for inland exterior applications.
See our full guide: Stainless Steel vs Galvanised Steel for Singapore Projects →
Material Finishings
| Finish | Suitable Materials | Notes |
|---|---|---|
| Mill finish (natural) | Stainless steel, aluminium | Interior applications; appropriate for internal applications (e.g. structural applications, interior facades). |
| Powder coat | Mild steel, aluminium, GI | Standard architectural finish; ready stock and availability. Affordable. |
| PVDF coating | Aluminium | High-performance fluoropolymer for facade panels with high UV exposure or long maintenance intervals. Highest cost. |
Standard Sheet Sizes and Custom Supply
Supply Bay supplies perforated metal sheet in standard 4FT X 8FT (1220mm × 2440mm) sheets and custom cut-to-size panels. For project supply, panels can be cut to specified dimensions prior to delivery, reducing site cutting labour and minimising exposed cut edges on galvanised material that require on-site touch-up.
Common Applications in Singapore
Architectural facades and cladding: Rain screens, secondary facade layers, solar shading panels on commercial and mixed-use buildings. Perforated metal facade panels contribute to ETTV compliance under BCA's Code for Environmental Sustainability by reducing solar heat gain through the building envelope.
Ceiling systems: Perforated metal acoustic ceilings with mineral wool or glass wool backing are the standard specification for offices, conference rooms, F&B spaces, and institutional buildings requiring reverberation control.
HDB upgrading and estate works: Covered linkway screens, void deck enclosures, bin centre ventilation panels, lift lobby feature panels, and precinct boundary screens across NRP, ROH, and HIP projects. See our HDB upgrading guide →
Privacy and balcony screens: Perforated panels for residential gates, balcony infills, pool surrounds, and staircase infill panels in landed and condominium projects.
Industrial and infrastructure screening: Plant room enclosures, substation screens, mechanical equipment guards, drain covers, and cable tray covers.
Green wall substrates: Perforated backing panels for planted wall systems, providing drainage, airflow, and consistent fixing points for planting modules.
Retail and F&B: Decorative wall panels, counter cladding, ceiling feature elements, and display fixtures.
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Round holes on staggered pitch is the most widely specified and stocked pattern in Singapore. It maximises open area for a given hole size, produces an even visual texture, and is available in a wide range of hole diameters and pitches across all material grades.
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Yes. Supply Bay supplies non-standard perforated patterns including slotted, square, hexagonal, and custom geometries. For fully bespoke patterns, CNC laser cutting is the appropriate process — there is no additional tooling cost.
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A minimum of 20% open area is required for perforated metal acoustic ceiling panels with mineral wool or glass wool backing to allow adequate sound energy transmission to the absorbent material behind. 25–35% is the standard range for most commercial acoustic ceiling applications.
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Standard perforated metal in stock specifications is available within 1–2 working days. Custom cut-to-size panels, powder coating, or non-standard hole patterns are typically ready within 1–2 weeks. Contact Supply Bay early for programme-critical orders.
Source Perforated Metal Sheet for Your Singapore Project
Supply Bay supplies perforated metal sheet in round, square, slotted, and custom patterns across aluminium, stainless steel, mild steel, and galvanised steel for architectural, commercial, industrial, and residential projects across Singapore. Contact us for a quote.
Supply Bay is Singapore's leading supplier of architectural sheet metal — expanded mesh, perforated panels, laser-cut screens, and solid sheets in aluminum, stainless steel (SS304, SS316), mild steel, and galvanized steel.
