Department of energy doe published r value recommendations based on specific heating and.
Attic insulation r value maryland.
Insulation level are specified by r value.
Duct r value supply in attic.
Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
Maryland energy code a law that lowers energy bills keeps homes safe.
Your home s r value score will guide you toward the type of insulation you need.
The higher the r value the better the thermal performance of the insulation.
N a all other ducts.
R value is the measure of your insulation s ability to resist heated or cooled air traveling through it.
A higher r value means greater efficiency.
Achieving greater r values in exterior walls.
R value is a measure of insulation s ability to resist heat traveling through it.
Get a free r value rating as a way to maximize the energy efficiency of both new and existing homes the u s.
However the climate that you live in will determine the r value level required to effectively keep your home at a consistent comfortable temperature.
Where you live different climates require different insulation r values.
Your home s age if your home is more than 10 year old you likely need more insulation.
For homes in the dc area the attic should achieve an r value between r 38 and r 60.
The table below shows what levels of insulation are cost effective for different climates and.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
If your attic has fiberglass batts you should have an r 49 layer of insulation at minimum which is around 12 or 13 inches thick.
There are many ways to retrofit a home with fiberglass and.
An insulation s efficiency is indicated by its r value.
R 8 inside thermal envelope.
The r value indicated on the packaging tells how much thermal resistance the insulation provides per.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
Most areas of the country have a higher minimum r value recommendation but just about everywhere recommends up to r 60.
Second r value is used if more than the insulation is located on the interior.
The higher the r value the better the thermal performance of the insulation.
If you have cellulose insulation you ll need an inch or two less.
In particularly cold climates you might go up to r 60.
Recommended home insulation r values.
According to energystar gov the recommended r value for attic insulation is between r 30 and r 60.
