Sandwich Panel Manufacturer

08 Pu Sandwich Panel Product Cross Section - Premium Structural Steel Component by Welldone Steel

Sandwich Panel Manufacturer

Welldone Steel is a trusted sandwich panel manufacturer, supplying high-quality insulated sandwich panels for industrial, commercial, warehouse, agricultural, and prefabricated buildings worldwide. Our sandwich panels are available with PU, PIR, EPS, and Rock Wool core options, offering outstanding thermal insulation, fire resistance, waterproof performance, and fast on-site installation — in custom sizes to match any project.

Core Options

PU / RW / EPS

Project-based selection

Thickness

50–200mm

Common insulation range

Panel Length

Customized

Cut by project drawing

Application

Roof & Wall

Enclosure and insulation

Small - Premium Structural Steel Component by Welldone Steel

SMALL SIZE

Length 3m , Width 950mm, Thickness 50mm

Best suited for cold storage rooms, insulated warehouses, clean workshops, and projects that demand strong thermal performance in a compact panel.

Medium - Premium Structural Steel Component by Welldone Steel

MEDIUM SIZE

Length 6m , Width 1000mm, Thickness 75mm

A balanced option for factories, workshops, and commercial buildings, especially projects where fire protection is a key requirement.

Large - Premium Structural Steel Component by Welldone Steel

LARGE SIZE

Length 12m , Width 1000mm, Thickness 100mm

Ideal for general-purpose warehouses, temporary structures, sheds, and budget-conscious projects that still need reliable insulation.

Customize - Premium Structural Steel Component by Welldone Steel

CUSTOM SIZE

Customized

Custom-made panels in any width, length, and thickness from 50mm to 200mm, engineered for superior sound absorption and insulation.

Parameter

Specification / Range

Parameter

Range

Core Material

PU, PIR, EPS, Rock Wool

Surface Material

Galvanized steel, pre-painted steel (PPGI/PPGL)

Steel Thickness

0.3–0.8mm (top and bottom sheets)

Effective Width

950–1150mm

Length

Custom, up to 12m

Thickness

50–200mm

Density

38–150 kg/m³ (varies by core type)

Fire Rating

Class A / B (Rock Wool offers the highest fire resistance)

Thermal Conductivity

As low as 0.022 W/(m·K), depending on core

Sound Insulation

Up to 30–35dB reduction

Water Resistance

Fully waterproof jointing system

Wind Resistance

Engineered for high wind-load regions

Color Options

RAL color chart, custom colors available

Our sandwich panels are manufactured in compliance with recognized international standards for building materials, and can be produced to meet specific regional codes for export markets upon request.

Structural Diagram

Sandwich Diagram - Premium Structural Steel Component by Welldone Steel

Sandwich Panel Structure Diagram

A steel sandwich panel is built from four key layers working together to deliver strength, insulation, and long-term durability.

Layer Breakdown

→ Upper Steel Sheet — Provides structural rigidity and protects against impact, weather, and mechanical stress.

→ Coating Layer — A protective paint or coating finish that resists UV exposure, corrosion, and fading, extending the panel's service life.

→ Insulation Core (PU / PIR / EPS / Rock Wool) — The heart of the panel, delivering thermal insulation, fire resistance, and lightweight strength.

→ Bottom Steel Sheet — Mirrors the top sheet for balanced structural performance and a clean interior finish.

Each layer plays a distinct role: the steel sheets provide strength and corrosion resistance, the coating extends durability under harsh weather, and the insulation core is what makes the metal sandwich panel so effective at regulating indoor temperature while keeping the overall structure lightweight.

Who Buys This Product

Cold Storage

Insulated sandwich panels keep refrigerated storage at stable temperatures with minimal energy loss.

Steel Workshop

Durable sandwich panel walls and roofs built for daily wear, machinery vibration, and long working hours.

Warehouse Wall

Sandwich panel wall systems that protect stored goods while speeding up large-scale warehouse construction.

Prefab House

Lightweight sandwich panels for fast-assembly, portable, and modular housing projects.

Poultry Farm

Moisture-resistant, easy-to-clean panels suited for livestock houses and agricultural buildings.

Clean Workshop

Sandwich panels with tight, hygienic joints for workshops requiring dust control and a clean finish.

Sales Tip: When presenting this product, ask about project size, local climate, installation plan, expected service life, and budget. For export buyers, clear drawings, packing marks, and fast response are major trust builders.

Storage

Steel Shed & Storage Project

Melbourne, Australia

3,200㎡

210 Tons

2024 Year

145d35e4 5daf 4bb5 A7d2 6cf96283ec98 - Premium Structural Steel Component by Welldone Steel

Steel Structure

Large Span Steel Building Project

United Arab Emirates

14,000㎡

1,050 Tons

2025 Year

Livestock Farm Building Dairy Barn Interior - Premium Structural Steel Component by Welldone Steel

Agriculture

Agriculture / Farm Building Project

Chattogram, Bangladesh

8,400㎡

460 Tons

2023

Workshop

Steel Workshop Building Project

Ho Chi Minh City, Vietnam

6,800㎡

520 Tons

2025 Year

Related Products

Explore our related steel structure products designed for durability, strength, and versatile industrial applications.

Solar Panel System

Energy Upgrade

Industrial Roof Use

Wind Load Design

View Details

Doors & Windows

Building Access

Security Options

Daylight & Visibility

View Details

Steel Decking

Composite Floor Support

Faster Construction

Load-Based Design

View Details

Steel Sheets Manufacturer

Roof & Wall Protection

Color Customization

Simple Installation

View Details

Purlin C/Z

Roof/wall support beam

Cold-formed steel

Easy installation

View Details

FAQ

Frequently Asked Questions

What is a sandwich panel?

A sandwich panel is a prefabricated building material made of two rigid steel sheets bonded to an insulating core — commonly PU, PIR, EPS, or Rock Wool. This layered structure combines strength, thermal insulation, fire resistance, and low weight in a single panel used for roofs and walls.

What are sandwich panels used for?

Sandwich panels are used as roofing and wall cladding for industrial buildings, warehouses, cold storage, commercial buildings, agricultural structures, and prefabricated or modular houses. They’re chosen where fast installation, energy efficiency, and weatherproofing are priorities.

Which sandwich panel is best for roofing?

PIR and PU sandwich panels are generally best for roofing because they deliver the highest thermal insulation per millimeter of thickness while staying lightweight. Where stricter fire codes apply, Rock Wool sandwich panel roofing is preferred for its Class A fire rating.

Can sandwich panels be used for walls?

Yes — sandwich panels are widely used as exterior and interior wall cladding. Sandwich panel walls provide insulation, weatherproofing, sound reduction, and a clean, low-maintenance finish for industrial, commercial, and agricultural buildings.

What thickness sandwich panel should I choose?

Panel thickness should match your building’s insulation and climate needs: 50mm for partitions and light structures, 75–100mm for standard commercial and industrial buildings, and 150mm or more for cold storage or extreme temperatures. A supplier can recommend the exact thickness based on your location and use case.

Are insulated sandwich panels waterproof?

Yes — insulated sandwich panels are waterproof when properly installed. They use sealed tongue-and-groove or interlocking joints along with coated steel surfaces that prevent water penetration and protect the insulation core from moisture damage.

How long do steel sandwich panels last?

Steel sandwich panels typically last 20–30 years or longer with proper installation and maintenance. Lifespan depends on steel coating quality (such as PPGI or PPGL), the core material selected, and the building’s environmental exposure.

What is the difference between PU, PIR, EPS, and Rock Wool sandwich panels?

The core material determines insulation value, fire resistance, and cost: PU and PIR panels offer the best thermal insulation and suit cold storage and roofing; EPS panels are the most budget-friendly and lightweight for general construction; Rock Wool panels provide the highest fire resistance, making them standard for buildings with strict fire safety codes.

Can sandwich panels be customized?

Yes — sandwich panels can be customized in thickness, length, core material, steel gauge, and color. Welldone Steel manufactures made-to-order sandwich panels matched to each project’s structural, climate, and architectural requirements.

Do you manufacture sandwich panels for export?

Yes — Welldone Steel manufactures and exports sandwich panels to international markets, including metal roof sandwich panels and wall panel systems, with experience handling export documentation, container loading, and international shipping logistics.