For homes in the dc area the attic should achieve an r value between r 38 and r 60.
Attic insulation r value maryland.
Maryland energy code a law that lowers energy bills keeps homes safe.
R value is a measure of insulation s ability to resist heat traveling through it.
Insulation level are specified by r value.
Duct r value supply in attic.
Where you live different climates require different insulation r values.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
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.
Department of energy doe published r value recommendations based on specific heating and.
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.
An insulation s efficiency is indicated by its r value.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
R 8 inside thermal envelope.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
The higher the r value the better the thermal performance of the insulation.
In particularly cold climates you might go up to r 60.
A higher r value means greater efficiency.
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.
Achieving greater r values in exterior walls.
Second r value is used if more than the insulation is located on the interior.
If you have cellulose insulation you ll need an inch or two less.
Recommended home insulation r values.
In addition atticat insulation provides an amazing r 49 value rating the recommended attic r value rating for the maryland climate zone.
Most areas of the country have a higher minimum r value recommendation but just about everywhere recommends up to r 60.
Your home s age if your home is more than 10 year old you likely need more insulation.
There are many ways to retrofit a home with fiberglass and.
Higher values indicate better insulation.
In general an attic s r value should be between r 30 and r 49.
According to energystar gov the recommended r value for attic insulation is between r 30 and r 60.
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.
The table below shows what levels of insulation are cost effective for different climates and.
