Trapezoidal Sheet Selection Guide: Types, Prices and Things to Consider

Trapezoidal sheetis one of the indispensable building materials in the construction sector, produced by cold-forming thin steel sheets into a trapezoidal profile. It is especially widely preferred in roofing, facade cladding, canopy and industrial building applications.

What Is Trapezoidal Sheet?

Trapezoidal sheet takes its name from the trapezoidal wave profile in its cross-section. This special profile structure gives the material high load-bearing capacity despite being a thin sheet. Choosing the right trapezoidal sheet type directly affects many factors from the longevity of your structure to its aesthetic appearance.

Trapezoidal Sheet Types

Galvaniz Trapez Saç

Galvanized trapezoidal sheetis produced by applying a zinc coating to both surfaces of a steel sheet using the hot-dip method. It is widely used in industrial buildings, warehouses and agricultural structures.

• More economical than painted trapezoidal sheet
• High corrosion resistance
• Can be applied without additional painting
• Recyclable material

Painted (Coloured) Trapezoidal Sheet

Special polyester or PVDF paint is applied over the galvanized coating. Preferred when visual aesthetics are a priority in roofing and facade cladding. Offers a wide range of colour options from the RAL colour chart.

• Wide colour options
• Double-layer protection (zinc + paint)
• Resistance to UV rays
• Visual harmony in architectural projects

Thickness Options

• 0.30–0.40 mm: Lightweight applications, canopies, pergolas
• 0.45–0.50 mm: Residential roofs, small commercial buildings (most popular)
• 0.55–0.60 mm: Standard industrial applications
• 0.70–1.00 mm: Heavy loads, wide spans, hangars

Profile Types

T-18 (18 mm)

Wall and facade cladding. Slim, modern appearance.

T-27 (27 mm)

Both roof and facade. Residential and small commercial buildings.

T-35 (35 mm)

Most popular roof profile. Industrial buildings, warehouses.

T-40+ (40+ mm)

Wide-span industrial buildings, hangars.

Roofing and Facade Applications

Roof Applications

• Minimum T-27, preferably T-35 profile
• Minimum 0.45 mm thickness
• Minimum 5% roof slope
• Adequate overlap distance
• For insulation, sandwich panel can be considered as an alternative

Facade Applications

• T-18 or T-27 profiles
• Painted trapezoidal sheet for aesthetic harmony
• Vertical or horizontal installation option
• Ventilation gap must be provided

Advantages of Trapezoidal Sheet

• Lightweight: Low load on the structural system
• Fast installation: Reduces labor costs
• High strength: Thanks to the trapezoidal profile geometry
• Corrosion resistance: Galvanized and paint protection
• Economical price: Compared to other cladding materials
• Long lifespan: 25–30 years and above
• 100% recyclable

Factors Affecting Prices

• Raw material prices: Global steel and zinc markets
• Sheet thickness: Price increases as thickness increases
• Coating type: Galvanized is more economical, painted is more expensive
• Profile type: Higher profiles require more material
• Order quantity: Unit price decreases with bulk orders
• Transport: Choosing a local manufacturer provides an advantage

10 Criteria to Consider When Selecting

1. Purpose of use (roof or facade?)
2. Climate conditions
3. Structural system load capacity
4. Aesthetic expectations
5. Budget planning
6. Manufacturer quality and certifications
7. Zinc coating thickness (Z value)
8. Paint quality (polyester vs PVDF)
9. Dimensional accuracy
10. Warranty and after-sales support

Maintenance Recommendations

• Visual inspection at least once a year
• Gutter and drainage cleaning
• Repair scratches and damage immediately with touch-up paint
• Screw and fastener inspection
• Remove metal debris
• Wash with low-pressure water once a year

Trapezoidal Sheet vs. Sandwich Panel Comparison

• Insulation: Trapezoidal sheet alone does not provide insulation; sandwich panel provides high insulation
• Cost: Trapezoidal sheet has a lower initial cost, which approaches sandwich panel when insulation is added
• Installation: Sandwich panel provides cladding + insulation in a single step
• Use: If no insulation is needed use trapezoidal sheet; if insulation is required use sandwich panel

Frequently Asked Questions

How long does trapezoidal sheet last?

Galvanized options last 20–30 years, painted options last 25–35 years. Quality and maintenance determine the lifespan.

Should I choose galvanized or painted?

Galvanized is economical for industrial buildings. Painted offers aesthetics for residential and commercial buildings.

Which thickness is recommended for roofing?

Residential: 0.45–0.50 mm. Industrial: 0.55–0.70 mm. Hangar: 0.70+ mm.

What affects the prices?

Raw material prices, thickness, coating type, profile type, order quantity and transport.

What should be considered during installation?

Use of EPDM-sealed screws, correct torque setting, adequate overlap, minimum 5% slope and a professional team.

Trapezoidal sheet for your needs, Velis LTD is by your side with 27 years of experience. We manufacture in both galvanized and painted options and offer free site surveys and price quotations.