While wall insulation is limited by the width of the studs different materials provide higher or lower r values.
Standard attic insulation r value.
In general an attic s r value should be between r 30 and r 49.
The further north northeast you go the colder it is and the more necessary r value will grow.
In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60.
When determining how much insulation you need don t guesstimate calculate.
The higher the r value the better the thermal performance of the insulation.
Where you live different climates require different insulation r values.
Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.
As a benchmark one inch of solid wood has an r value of 1.
There are many ways to retrofit a home with fiberglass and.
However this value varies not only on the basis of the type of insulating material but also on the area.
While some ceilings in the southwestern part of the united states require a minimum of r 19 insulation most attics or ceiling areas require a minimum of r 38 in the ceiling.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
Insulation level are specified by r value.
Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.
R value measures how well certain building insulation materials can resist heat.
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 along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Let s say the insulation you ve selected has an r value of three per inch and.
The higher the r value the greater the insulation performance.
The table below shows what levels of insulation are cost effective for different climates and.
Your home s age if your home is more than 10 year old you likely need more insulation.
In particularly cold climates you might go up to r 60.
Fiberglass batts for standard 2 4 walls are now available in low medium and high density products that range from r 11 to r 15.
