3 1 2 insulation r 11 5 1 2 r 19 etc.
Cheapest insulation per r value.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
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.
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.
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.
These can be combined for best insulation quality.
The material is costly and fragile factors that have limited its use in residential construction.
It has an r value of 6 7 and covers 5 3 square feet.
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.
Each type comes with unique advantages.
Home depot sells a roll of 16 inch by 48 inch denim batt for 11 20.
Best insulation r value per dollar.
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.
That would be a helpful factor in determining how much more you should add.
For example a wall with 3 fiberglass batting r value of 10 8.
Denim is also available in a loose fill insulation.
Standard fiberglass blanket insulation adds between 3 2 to 3 4 r per inch.
This product typically has an r value of 3 6 to 4 0 per inch of thickness.
But with that said here are some general guidelines.
We don t know what you have now r value or type.
Also called styrofoam insulation this is the least expensive material.
Notes on the r value k values of different forms of asbestos.
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.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Consider spray foam anywhere you need an air barrier as well as insulation.
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.
Here are some currently available high r building insulation products as well as some specialty very high r insulation materials.
Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.
Notes to the table above.
It provides r values that range from 3 6 to 4 2 per inch.
Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation.