Installing Sub Floor In Room Without 90 Degree Corners

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Installing sub floor in room without 90 degree corners.

A mitered joint is made with both ends of the molding cut at a 45 degree angle and fitted together to form a 90 degree inside corner. Built up drywall compound and imperfect corner bead installation or framing generally leave you with something greater or less than an exact 90 degree angle and standard 45 degree miters won t work. This is the type of joinery used in most picture frames and many other woodworking projects where perfect 90 degree angles are required. These step by step instructions demonstrate how to easily install subfloor panels in an empty room.

Only about half the time can you cut 45 degree miters on base boards and have them meet perfectly on outside corners. If you are unsure what angle you need imagine where your seating is in your room compared to the corner and pick the angle that best suits your needs. Modern cabinetmakers and installers use a small item called a scribe tool to remedy. See the diagram to the right.

Out of square corners those that don t form a perfect 90 degree angle are common when installing cabinets. Using the original sub floor nails as a guide mark the floor joist locations on the wall to know where to insert the screws.