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Types of Metal Roofing Sheets and Installation Methods

2026-07-17 - tags：Corrugated metal roofing sheets Corrugated steel sheets Metal Roofing Sheets

I. Roof panel types (overlapping, interlocking, snap-fit)

b—plate width; bd—wave pitch; h—wave height; t—plate thickness.


Overlapping roof panel	Interlocking roof panel

180° interlocking roof panel	360° interlocking roof panel

II. Typical connection structures: (self-tapping screws, interlocking type, snap-fit type)


Overlapping roof panel connection structure (with waterproof cavity, exposed fasteners)	Overlapping wall connection structure one (exposed fasteners)

Overlapping wall connection structure two (concealed fasteners)	180° interlocking roof panel connection structure one (180° interlocking)

180° interlocking roof panel connection structure two (360° interlocking)	Interlocking roof panel connection structure

III. Applicable Conditions

(1) For roofing profiled steel sheets, interlocking or snap-fit sheets with concealed fasteners are preferred. When using overlapping sheets with exposed fasteners, the edge shape of the overlapping sheet should form a waterproof cavity structure.

(2) Vertical wall panels should use overlapping sheets with exposed fasteners; horizontal wall panels should use overlapping sheets with concealed fasteners.

IV. Types of Color Steel Sheet Substrates

(1) The nominal thickness of the profiled steel sheet substrate for walls should not be less than 0.5mm, the nominal thickness of the profiled steel sheet substrate for roofs should not be less than 0.6mm, and the nominal thickness of the profiled steel sheet substrate for floors should not be less than 0.8mm.

(2) Color-coated steel sheets for construction typically use hot-dip galvanized substrates and hot-dip aluminum-zinc alloy substrates, both of which have good corrosion resistance.

Substrate type	Hot-dip galvanized substrate	Z
	Hot-dip galvanized iron alloy substrate	ZF
	Hot-dip aluminized zinc alloy substrate	AZ
	Hot-dip galvanized aluminum alloy substrate	ZA
	Hot-dip aluminized silicon alloy substrate	AS
	Hot-dip galvanized aluminum magnesium alloy substrate	ZM
	Electro-galvanized substrate	ZE

V. Color Steel Sheet Coating

The following four types of topcoat are used.

(1) Polyester: Moderate durability, good hardness and flexibility, moderate price. (>5 years)

(2) Silicon-modified polyester: Improved durability, gloss, and color retention, but reduced toughness. (>10 years)

(3) High-durability polyester: Combines the advantages of polyester with improved durability, high cost-performance ratio. (>15 years)

(4) Polyvinylidene fluoride (PVDF): Excellent durability and good toughness, but relatively low hardness and high price. (>20 years)

Primers can be epoxy, polyester, or polyurethane. Polyurethane has better overall performance.

Topcoat Types	Polyester	PE
	Silicone-modified polyester	SMP
	High-durability polyester	HDP
	Polyvinylidene fluoride	PVDF

For more information needed or any inquiry,please feel free to contact Yumisteel team.