Notes on the r value k values of different forms of asbestos.
Cheapest insulation per r value.
Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation.
We don t know what you have now r value or type.
For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Opt for the closed cell variety if you need an air barrier vapor barrier and efficient insulation in the least amount of space possible.
It provides r values that range from 3 6 to 4 2 per inch.
But with that said here are some general guidelines.
This product typically has an r value of 3 6 to 4 0 per inch of thickness.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Notes to the table above.
Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s.
Consider spray foam anywhere you need an air barrier as well as insulation.
Best insulation r value per dollar.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.
3 1 2 insulation r 11 5 1 2 r 19 etc.
Also called styrofoam insulation this is the least expensive material.
The best places to insulate will always be the areas where the most heat per square foot is leaving in the heating season or entering in the cooling season.
Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.
It has an r value of 6 7 and covers 5 3 square feet.
For example a wall with 3 fiberglass batting r value of 10 8.
Denim is also available in a loose fill insulation.
That would be a helpful factor in determining how much more you should add.
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.
Open cell spray foam is rated at about r 3 5 per inch while closed cell spray foam is much more efficient at r 6 0 to r 6 5 per inch.
Stop the largest losses leaks first.
Aerogel has an r value of about r 10 per inch is 99 air and insulates up to 37 times higher r value than fiberglass.
The material is costly and fragile factors that have limited its use in residential construction.
Standard fiberglass blanket insulation adds between 3 2 to 3 4 r per inch.
The way a home or business building is insulated has a huge impact on the heat loss gain.
Here are some currently available high r building insulation products as well as some specialty very high r insulation materials.
Home depot sells a roll of 16 inch by 48 inch denim batt for 11 20.
