Electricity insulation is a large group of materials which do not conduct electricity. Those materials are used to protect us from electricity. Rubber, plastics, ceramics are only some of the different types of materials which are good insulators.
Glass and Mica are good insulator for electricity
Fiberglass.
conductors
It could be hay, cotton, paper and animal skins.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatcond.html
you just need to pick a material and set up your labbeled diagram.
There are different types of attic insulations and grades. To find out what you need go to lowes.com or homedepot.com.
You size wire by the current. Various insulations are rated for voltage, temperature and the medium where the wire will be run.
G. D. Plumb has written: 'The sound insulations of metal-framed partitions having structural loadbearing properties'
Many different companies make spray insulation. Dow Styrofoam, Demilec, Icynene, and Certainteed are three very reputable brands of spray foam insulations.
Silica cement is a refractory mortar that is suitable for laying silica brick. It is equipped with an AX moldable to make it easily bond to itself and other fibrous insulations.
Loose fill (usually fiberglass or cellulose) or batt insulation (usually fiberglass) are both good insulations for attics. Batts are better for do it yourselfers, but loose fill is cheaper to install when using a contractor.