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Chrysotile cement products vs. competitors


Over the past 15 years chrysotile cement products have demonstrated some advantages over competitive building materials such as asbestos-free fiber-cement products and metal roofing.

Apart from its remarkable properties chrysotile cement has a better price and durability – its service life is 50 to 60 years and over. Besides, the use of local Portland cement helps save currency funds and labor costs. Their production is less energy-consuming. Taking into account all these factors we can conclude that chrysotile cement products have obvious environmental advantages over competitive products.

 

COMPARATIVE CHARACTERISTICS OF SOME ROOFING MATERIALS

N

Characteristics

Asbestos-cement sheets

Corrugated galvanized iron sheets

Aluminum sheets

1

Service life

50 (min) Stainless

10-15

N/A

2

Maintenance

Not required

Every 3-5 years

Not required

3

Fire danger

Inhibitor

Tend to distort and melt

Tend to distort and melt

4

Heat insulation

Good

Weak

Weak

5

Sound insulation

Good

Weak

Weak

6

Wind and rain-generated noise absorption

Good (reduces the noise)

Weak

Weak

7

Energy consumption required for manufacturing (kW.h/sq.meter)

1.0

36.6

33.0

8

Potential work pressure

Intensive

Low

Low

9

Aerodynamic resistance after installation

Good

Weak

Weak

10

Weathering

No

Rusting of drilled holes and cracked zinc coating

Oxidation of the surface

11

Bimetallic reaction

No

No

When contacting with concrete and other materials if wet

12

Condensation

Low, having no effect on the sheet

High, leading to corrosion

High, affecting the sheet

13

Protective coating

Not required

Not required

Necessary to prevent a direct contact with cement, lime, iron, copper, etc.

14

Storage

May be kept in the open in working areas

Must be kept indoors to prevent weathering

Must be kept indoors to prevent weathering

15

Efficiency of coverage

Almost 50 % higher than that of corrugated galvanized iron sheets and aluminum sheets

The area coverage is only 67% of that with asbestos-cement sheets

The area coverage is only 67% of that with asbestos-cement sheets

16

Cost

Low

High

High

 

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