Vermiculite Insulation R Value

Over time the r value of xps insulation can drop as some of the low conductivity gas escapes and air replaces it a phenomenon is known as thermal drift or ageing.

Vermiculite insulation r value. Vermiculite is a mineral mined from the earth composed of shiny flakes that look like mica. Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal. Vermiculite is a hydrous phyllosilicate mineral which undergoes significant expansion when heated. As long ago as 1945 the national bureau of standards reported in its bms report 103 that the.

16 1 m2k w per metre of insulation. And not only do they significantly increase the tested r values of these walls they also can help change the fire rating of many walls from a basic 2 hour fire rating to a 4 hour rating. How much good can i get out of perlite or vermiculite concrete as an insulating material under a slab on ground for my house. Notes on the r value k values of different forms of asbestos.

Insulation and the r values shown above should be used for the purposes of comparison with other system values. Polystyrene loose fill or bead insulation typically has a lower r value compared to the foam board. Perlite and vermiculite are used as loose fill insulation in the construction of modern insulated masonry wall systems. A principal derived from this material is zonolite stabilized concrete aggregate.

Vermiculite is a form of mica that expands when heated. Zonolite when mixed with. Before giving a specific answer we should point out that it is normally uneconomical to use insulation under the whole slab. When this mineral is put in an oven it expands like popcorn.

Since it has an r value of about r 2 per inch it was used for decades as an insulation material. Notes to the table above. Vermiculite has many uses such as loose fill insulation for attic spaces block core fill insulation insulation around chimney flues and in gardening applications. K value 0 063 w mk.

The thermal resistance or r value of polystyrene foam board depends on its density. Vermiculite forms by the weathering or hydrothermal alteration of biotite or phlogopite. Large commercial vermiculite mines currently exist in the united states of america. The bright walls of the vermiculite mica flakes are a multitude of screens that reflect and disperse the heat energy transmitted by radiation and make such the insulating material suitable for high temperatures.

Can you give me an r value. Fiberglass blankets and batts. Expanded vermiculite is lightweight fire resistant and odorless.