Floor Opening Framing

Thickness of floor structure floor finish material plus joist plus plywood plus ceiling finish required headroom.

Floor opening framing.

Where the header joist span does not exceed 4 feet 1219 mm the header joist shall be a single member the same size as the floor joist. Openings in floor framing shall be framed with a header and trimmer joists. The location of headers and trim joists depends upon the length of the floor opening and the direction of the staircase and these. Its length depends on how much headroom you need.

Your sketch should depict the floor s basic shape and layout complete with any additional features like alcoves nooks and staircases. The length of the opening in the upper floor. This type of construction is the most difficult but does provide unobstructed openings between the floors allowing for easy installation of utilities without notching and cutting openings. Yet through planning and personal attention falls through openings under foot are very easy to prevent.

Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s. Nosing the amount the stair tread projects passed the vertical riser below if there is any the results. Floor openings are hazardous because workers may fall through them and or may be struck by objects that fall through openings. The thought of cutting through your floor might seem scary but installing any new staircase whether rigid stairs from one floor to another or pull down stairs leading to an attic requires an opening in the floor.

If you make a hole guard it. When framing floor openings techniques include the installation of trimmer joists which are double joists that beef up the joists on either side of an opening and headers that run perpendicular between joists. A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. Before cutting the hole barricade the work area to keep.

Before you begin cutting or measuring grab a pencil and paper and sketch an outline of your floor. Draw up a basic floor framing plan. Construction safety floor openings unprotected holes in the floor deck or roof have been responsible for a number of very serious injuries. There may be floor openings as each new floor in a building is added for personnel and material access and for stairwells elevators or skylights.

Single trimmer joists shall be used to carry a single header joist that is located within 3 feet 914 mm of the trimmer joist bearing. Floor openings on a job site can occur during construction renovations or repairs. Extremely long spans staircases or interior walls typically require additional support which can complicate your framing. The second story floor joists are supported by a ribbon board set into the studs.