Nj Attic Insulation R Value

There are many ways to retrofit a home with fiberglass and.

Nj attic insulation r value.

9 out of 10 homes in the u s. Your home s age if your home is more than 10 year old you likely need more insulation. 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. In addition to the radiant barrier we offer a formaldehyde free johns manville blown in insulation to bring your attic insulation up to r 38 approximately 15 inches which is code for the state of new jersey.

The insulation for basement walls must be from the top of the wall down 10 feet below grade or to the basement floor whichever is less. Common attic air leaks this image shows how and where air can easily escape from a home s attic. Add insulation to attic. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc.

R 5 shall be added to the required slab edge r values for heated slabs. The r value is a measurement of thermal resistance or how much the insulation can resist heat flow. Achieving greater r values in exterior walls. Department of energy recommends installing attic insulation that has an r value between r 49 and r 60.

Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Recommended insulation levels for retrofitting existing wood framed buildings.

Our fiberglass insulation is 100 recycled and is the only insulation product guaranteed to remain at its original r value. R values for walls represent the sum of cavity insulation plus insulated sheathing if any. The higher the r value the better the thermal performance of the insulation. Following are illustrations identifying common problems and what proper attic sealing and insulation should look like.

The second r value for mass walls applies when more than half the insulation is on the interior of the mass wall. Existing 3 4 inches of insulation. In new jersey the u s. 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.

The first value is cavity insulation the second value is continuous insulation so 13 5 means r 13 cavity insulation plus r 5 continuous insulation.