Okay, so why is a 2”x 4” used for the joist, rather than a 2”x 8”? In addition, you’ll need to notch the pieces of decking to go around the truss webbing. How To Add Attic Flooring Without Wrecking Your Roof The Money Pit . All trusses are a series of triangles, with the occasional pentagon thrown in. feet of space. Don’t use 7/16” OSB, as it is intended for external sheathing and isn’t strong enough to be used as a floor. The panels are made with tongue-in-groove long sides, so that it is easy to join them together. If you have this, it will most likely be one of the walls for the hallway, which will run the length of the house, including doorways and archways. It’s not ideal, but it can be walked on and used for storage. To floor an attic, you’ll need to install a sub-floor for support before laying your plywood floor. The shock and vibration of nailing the joists can cause cracking in the drywall ceiling and the texture to fall off. One way many people like to make up for this is using their home’s attic to provide a little extra storage space, especially if the home doesn’t have a basement that can be used for storage. Not all attics can be floored easily; it depends on how the home’s roof and roof structure is constructed. If the fiberglass insulation does not reach the top of the ceiling joists, additional boards are not required. These are necessary to prevent moisture from building up in the attic, as well as provide proper ventilation to prevent excess heat from building up in your attic area. In addition, shelves can easily be added between the rafters, spanning the supporting members from the roof rafters to the webbing. EDIT1: One other thing to consider is you probably want to provide protection for any of the wires that end up under the flooring. This layer will help deal with the crushing of the existing insulation, as well as adding additional insulation to your attic, helping reduce your heating bills. First, you'll need to measure the area you want to floor so you can calculate how much wood you’ll require. Place a 2-inch by 3-inch board directly on top of the joist nearest to the edge of the attic, with its largest surface touching the joist. Then you can do specialty storage for items that don’t fit neatly into boxes. Attic flooring and insulation installers based in Dublin. The ultimate resource for plywood. When you inspect your attic, compare the current insulation to the ceiling joists for the floor below (floor joists for the attic). While that will flex the rafters slightly, mostly it will push the ends of them tighter together, reinforcing the strength of the truss. You have to buy at least 10 bags of the insulation anyway, in order to get free use of the machine for blowing it in, so you may as well go to town with it. To do this, you need to know two things. How can this damage the home? Went to the home improvement store about putting a floor in the attic on top of the insulation and rafters. We bought a townhouse last month, which has a ~400 sq. Since you’re going to be putting in a floor, you won’t be able to insulate your entire attic to R-49; about the best you’re going to manage under the floor is about R-38. Proper attic flooring over the insulation keeps some storage space as well. This will make the installation of these new joists easier, while spreading the weight across several joists. That space is just ½” drywall, covered with insulation and mounted to be the ceiling below. 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