Vermiculite Insulation R Value

Before giving a specific answer we should point out that it is normally uneconomical to use insulation under the whole slab.

Vermiculite insulation r value.

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. Polystyrene loose fill or bead insulation typically has a lower r value compared to the foam board. Vermiculite is a form of mica that expands when heated. 16 1 m2k w per metre of insulation.

Perlite and vermiculite are used as loose fill insulation in the construction of modern insulated masonry wall systems. As long ago as 1945 the national bureau of standards reported in its bms report 103 that the. Notes on the r value k values of different forms of asbestos. Expanded vermiculite is lightweight fire resistant and odorless.

Type of insulation r value per inch of thickness. Exfoliation occurs when the mineral is heated sufficiently and commercial furnaces can routinely produce this effect. Fiberglass blankets and batts. Vermiculite is a hydrous phyllosilicate mineral which undergoes significant expansion when heated.

When this mineral is put in an oven it expands like popcorn. 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. K value 0 063 w mk. Vermiculite is a naturally mined ore product that is non combustible and fire proof.

The thermal resistance or r value of polystyrene foam board depends on its density. Since it has an r value of about r 2 per inch it was used for decades as an insulation material. Can you give me an r value. Notes to the table above.

Zonolite when mixed with. Large commercial vermiculite mines currently exist in the united states of america. Vermiculite forms by the weathering or hydrothermal alteration of biotite or phlogopite. Vermiculite is a mineral mined from the earth composed of shiny flakes that look like mica.

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 has many uses such as loose fill insulation for attic spaces block core fill insulation insulation around chimney flues and in gardening applications. How much good can i get out of perlite or vermiculite concrete as an insulating material under a slab on ground for my house.