Use a permanent marker to mark the level every few trusses so you know you have even coverage around the entire space.
How to measure for insulating an attic.
In general an attic s r value should be between r 30 and r 49.
Click the button to calculate the amount of insulation in square feet and man hours wall and ceiling fiberglass insulation needed for this job.
Purios e which should be covered with attic is at least 21 cm.
For loose fill read labels.
For batts or rolls calculate the number based on the width and length of the product you re using.
Measure your attic s square footage.
Inspecting your attic 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.
Each bag lists the required depths for a range of r values and the number of bags needed to cover 1 000 square feet at those depths.
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.
Find the rough surface area of the base of your attic and ask the seller how many pounds of fill will be required to fill that area to 11 inches 27 9 cm deep.
For example if you attic floor area is 30 x 50 then you re measuring 1 500 sq ft.
The thickness of the attic insulation depends on the value of heat transfer coefficient u.
You determine this by multiplying the length x width of the space.
Generally speaking without any preexisting insulation in place it takes 10 12 inches 25 4 30 5 cm of loose fill to achieve an r rating of about 38 40.
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.
When you re blowing insulation it can get dusty and hard to see whether you ve got it deep enough around the entire attic.
This calculator is to be used as an estimating tool only.
In particularly cold climates you might go up to r 60.
Input length and width of area to be insulated.
Measure up from the drywall to mark your desired blown in insulation level.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.