In April I had an energy audit done to my new home. One of the big findings was my house did not have enough insulation in the attic. There is a lot of heat exchange from the 2nd floor into the attic through gaps in the walls, light and electrical sockets and other areas. The company who performed the audit suggested to add an additional 8 inches of blown cellulose insulation in to the attic on top of the existing pink insulation bats that lay in between the attic floor joists. The problem is I would no longer be able to use the attic for storage(xmas decorations, clothes, ect.). So I decided to find a solution. After extensive research online I found there was not much out there that had been done or documented.
Step 1: The layout
In the picture it is clear there is a large space in the attic. In order for the cellulose insulation to work at its best it can not be compressed. So I decided to build a floating storage platform. I used a plum-bob from the center point in the roof and made a center line. Next I measured from that line just shy of 6 feet to both sides. I then cut 4ft lengths of 2 x 4 to create the studs.
Step 2: Studs
I then cut 4ft lengths of 2 x 4 to create the studs. I attached them to the attic floor and ceiling joists using 5/16 nuts and bolts with lock washers.
I then laid out all of the cross joists. I used 2 x 6 x 12 boards. I marked each stud so the bottom of the joist would be 10 inches above the floor joists to allow for the 8 inches of insulation.
Step 4: Platform
These pictures show the main platform. It is a little over 11 ft wide and 10 inches above the floor rafters. There will be 8 inches of blown cellulose insulation. The last picture shows the clearance between the pink bat insulation on the attic floor and the new platform.