Take advantage of the existing potential of your home. Building an attic room can be both fun and rewarding. Just imagine all the additional space you can add to your living space at moderate cost and effort.

Tips for Building Attic Floor:

  • Existing joists are usually not enough to support weight for living spaces
  • If joist are 2×8″ or larger it may be enough – consult local buildign codes to make sure
  • If not enough add a second joist ajacent to existing ones and nail together
  • Plan the plumbing, wiring, ductwork and partition walls before adding any additional joists
  • Use 3/4″ tongue-and-groove plywood as subfloor

How to Add Attic Joists

  • Remove insulation and any bridges between the existing joists
  • Measure and cut the additional joists
  • If the additional joists are arched, make sure to install them with the arch up
  • Set the additional joists in place and nail them to the supporting walls with 16d common nails
  • Face-nail the joist together – use 10d common nails
  • Install blocking between the joists as required by local building code

How to Install Attic Subfloors

  • Make sure that the framing, wiring, plumbing and duct work are completed
  • Pass all the required inspections
  • Install insulation as required
  • Add and fasten subfloor 3/4″ plywood sheets
  • Make sure the sheets are perpendicular to the joists and staggered between rows
  • Use 2 1/2″ wallboard or deck screws
  • Apply floor patching , latex or acrylic additive over the screw heads and plywood seams
  • After drying, sand the compound with a power sander

Tips for Installing Attic Subfloors:

  • Start along the longest wall and screw every 6″ at 8″ intervals in the field of the plywood sheet
  • Make sure the underlayment seams are not aligned with the subfloor seams
  • Drive the deck screw heads bellow the surface of the plywood sheet
  • Leave the same 1/4″ expansion gap between the sheets and the walls

Required Tools and Materials:

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