Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live.
Insulation amount for attic shaft.
This calculator is to be used as an estimating tool only.
The main factors that impact the cost are.
Add the right kind of insulation.
The average recommended level is 17 inches of r60.
They sport insulation values of approximately r 6 5 and r 3 6 per inch respectively.
Contractor or insulation installer s fee.
Input length and width of area to be insulated.
The average recommended level is 17 inches of r60.
Square footage of your attic.
As time passed many of these batts flopped over backward onto the attic floor.
Then reference the back of the insulation package to determine the proper height to get the right r value for your project.
Inspecting your attic insulation.
In the past builders paid little attention to sealing air leaks in skylight shafts and insulation usually consisted of a few fiberglass batts.
In zone 3 the average minimum requirement for attic insulation is 9 inches of r30 fill.
The higher the r value the better the thermal performance of the insulation.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
Homeowners availing of the attic or rafter insulation grants under the seai better energy homes programme are required to install insulation achieving the minimum required u values of 0 16 w m 2k for ceiling level insulation or 0 20 w mk for rafter insulation.
Such a casual approach to skylight shaft insulation is no longer acceptable.
Type and material of your insulation.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic.
When installed properly both types of insulation fill all of the nooks and crannies in a space and make for a perfect air barrier.
A homeowner s guide to attic and rafter insulation.
In zone 4 the average minimum requirement for attic insulation is 11 inches of r38 fill.
Closed cell and open cell aka 2 pound and pound respectively.
Spray foam offers the best attic insulation performance available.
Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
To determine how much insulation you re going to need measure the length times the width of your attic to get the square footage.
When air can t move through it you have zero heat transfer through convection.
