Remove all the shingles or other roofing material so you can begin the project on the bare roof deck, or wood. Sweep the area clean of dirt.
Measure the roof area and use a circular saw to cut the fiberboard to cover the roof and fit flush against the edges.
Install the fiberboard using 4-inch nails placed through installation plates. These small circular discs help secure a larger area of the board so it is less likely to crack around the nails. Sweep the area clean.
Unroll a roll of roofing material, beginning at the edge of the roof. Cut out areas for vents, pipes or any odd angles of the roof with a utility knife. Roll the material back up and place it near the starting point of the project.
Roll a smooth layer of bonding adhesive, as wide as four widths of the paint roller, on the area where the first roll of roofing material will be installed.
Unroll the rubber roofing, positioning it on the adhesive. Press down with a push broom, beginning in the center and moving to the edges.
Repeat the process of applying the bonding agent and unrolling the rubber roofing until the roof is covered. Add additional bonding around the edges to seal it.