VERSATILE
Vermiculite lightweight concrete can be applied over a variety of bases, allowing architects and engineers ample flexibility in their design criteria. The thickness of the concrete can be varied to permit necessary slope to drain.

ADVANTAGES
Lightweight – When compared with structural grade concrete, vermiculite concrete is 15% of the weight. This results in considerable savings from the footings thru the structural steel.

FIREPROOF
The fireproofing characteristics of vermiculite concrete are recognized nationwide by insurance companies, state rating bureaus and local building officials. Underwriters’ Laboratories have assigned up to 4-Hour ratings to system that employed vermiculite as one of the components.

VERMECULITE

General

Category

  • Mineral

Chemical formula

  • (MgFe,Al)3(Al,Si)4O10(OH)2•4H2O

Identification

Color Bronze

  • Yellow

Crystal habit

 

  • Clay, scaly, aggregate

Crystal system

  • Monoclinic

Cleavage

  • Perfect

Fracture

  • Uneven

Mohs Scale hardness

  • 1.5-2

>Luster

  • Vitreous

Streak

  • Pale yellow

Specific gravity

  • 2.4-2.7

Refractive index

  • Translucent

Pleochroism

  • None

Mohs Scale hardness

  • 1.5-2

Luster

  • Vitreous

Streak

 

  • Pale yellow

Specific gravity

 

  • 2.4-2.7

Refractive index

 

  • Translucent

Pleochroism

 

  • None

INSULATION
Vermiculite concrete has excellent insulating properties. Three inches of vermiculite concrete is equivalent to 7.5 cm of rigid board insulation laid over steel decks. One 2.5cm of vermiculite concrete is equal in insulating value to 50 cm of regular concrete.

SPECIAL FEATURES
Reroofing – Slope to drain systems employing vermiculite concrete and polystyrene ventboard provide an economical solution to existing flat roofs with damage due to ponding of water.

SUBSTRATES
Vermiculite concrete is suitable for installation over most structurally sound roofing systems with structural decks of concrete, metal, or wood. Care must be taken to properly vent decks poured over impervious materials.

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