Insulation

 

Cellulose insulation is formed from shredded paper products, mainly recycled newspapers.  It is seen as being a very environmentally friendly insulation because of the recycled content, which can be up to 100%.  The insulation properties are stated to be higher than standard insulations used, and can be varied as the insulation is applied by spraying it into place.  The insulation is often sprayed wet to prevent dust build-up and increase cohesion.  The cellulose insulation is treated with boronates to prevent fungal attack and act as a fire retardant.

 

Fibreglass insulation is commonplace in construction.  It has good insulative properties and can be rolled into place in sheets.  It is formed from fibres of molten glass which are spun together and it is possible to include some recycled glass in the manufacture.

 

Plastic foams are used for insulation.  The foams include expanded polystyrene and polyurethane, which were up till recently expanded using CFCs.  It is for this reason that they are the least preferred option, although their insulation properties are good and application is easy as sheets are simply rolled into place.

 

Transparent insulation carries out the functions of standard insulation materials whilst still allowing the passage of light through it.  There is little conduction of heat due to the low density structure, of which several variations are available.  Convection and radiation are also very much reduced.  Transparent insulation can be used to insulate solar collectors and trombe walls, such that solar radiation can enter through the insulation but heat losses are prevented.