Metal Bridging For Floor Joists
Joists
Exterior walls supporting floor joistsIf the floor joists are supported by exterior walls, straps are not required longitudinally of the joists in houses containing no more than two storeys where the joists are at centers not exceeding 800mm and;
Have a bearing of at least 90 mm on supported walls or a bearing of 75 mm on a wooden wall plate at each end. Diagram C128 - Typical section detail around stair opening
Support floor joists with a steel beam
A problem with the use of steel members to support floor joists in the case of dormer or one-and-a-half-storey roofs is that when the joists are notched into the web, there may be a loss positional continuity. Diagram C130 - Typical detail to ensure rigid floors
When building joists into walls, ensure that a 90mm bearing is provided and that the gap left between the joist and the blocks is well filled with mortar. Diagram C130 (a) - Minimum bearing detail for floor joists embedded in walls
Diagram C131 - Typical padding and bridging to ensure rigid floors
Diagram C132 - Typical Herringbone Spacer and Packing Details
Notching and drilling
IS. Diagram C133 - Simply Supported Joists - Notching and Drilling
Diagram C134 - Typical relief limitations
Diagram C135 - Typical drill limits
Exclusive floor joists
The following section provides construction guidance and general information regarding the use of proprietary engineered wood joists such as I-joists and steel web joists in masonry construction. Diagram C136 - Typical Proprietary Wood I-Joist and Steel Web Joist
Third-party certification, which describes compliance with building regulations, namely Irish Agreement Board (IAB) certification, British Board of Agreement (BBA) certification and, occasionally, European Technical Approval (ETA) certification , must be provided when proprietary wood I-joists and open steel web joists are used. Drilling and notching
Ensure that the webs and flanges of I-joists and steel web joists are never drilled, notched or altered without the manufacturer's written approval. Drawing C137 (a) - Miscellaneous typical end bearing details
Drawing C137(b) - Miscellaneous typical end bearing details
Handling and storage
Joists should be stored vertically and evenly stacked with supports aligned above the floor and protected from the weather when stored. In the case of wood I-beams and open steel web joists, the manufacturer's instructions should be followed during handling and installation as they are lightweight and have unique characteristics. Diagram C138 - Typical Detail of Lateral Restraint Strapping to Exterior Walls
Web and joist stiffeners
To prevent joist buckling, it may be necessary to include web stiffeners at critical load points, such as heavy point loads, cantilever supports, or load-bearing bulkheads. For open steel web joists, stiffen with laterally braced solid timber; for I-joists, include plywood or OSB attached to either side of the joist.
Us2455904A - Metal Cross Bridging
- Google Patents
The objects of the present invention are to provide an improved metal strut or bridging unit with superior resistance to twisting under tension and stretching under load; provide a bridging unit having minimal dust collecting surfaces thereby reducing the primary hazard normally associated with the use of such devices; provide i.a bridging unit providing more space for the pipes to pass through; and, to provide a bridging unit which will allow a minimum of separation from wooden beams to which it may be attached and which is particularly suitable for use with joists or beams at different centers and of different depths. Figure 1 of the drawings is a cross-sectional view taken through adjacent floor joists, showing the "novel application of metal bridging units of this invention; Yes
Figure 2 is a plan view of the improved metal decking as applied to 4 adjacent joists, taken on line 2-2 of Figure 1;
Figure 3 is an enlarged fragmentary view of one end of an arm of the bridging unit as applied to a floor joist; and,
Figures 4 and 5 are enlarged fragmentary views of the attachment ends of an arm of the bridging unit for application to a floor joist. Each arm is twisted axially at each end through an arc of substantially ninety degrees to provide a relatively short anchoring, securing or nailing portion at each end through which the deck 1 is adapted to be nailed or otherwise securely anchored at the top and bottom. faces of adjacent beams. When installing the bridging to brace a pair of adjacent parallel beams, the pair of attachment portions at opposite ends of each arm are bent on opposite sides of the axis of the arm substantially at the onset of twist in the arm of parallel, or substantially parallel, to each other on opposite sides of the longitudinal axis of the arms. Since the arm attachment portions terminate at their inner ends at the twists of the arms, each bridging unit can be sized to be suitable for use with beams of different selected depths arranged on different centers. two bridges of beams according to the figures: 1' and 2, each bridging unit is placed between the beams i' with the twisted parts 1 to; oir-substantially to the edges of the beams. metal strips' of: whose arms 41 are:
formed', .they' provide.y a minimum; dust-collecting surface, reducing the risk of fire from using the large wooden surface;
conventionally employed relay members. with the leveling of an: overlying surface such as the floor covering 2; However, even more importantly, it will become clear that by having the twisted portions of the arms arranged at the inner end of the. The combination with a pair of spaced beams of bridging units comprising a pair of bracel arms pivotally connected midway between the inner ends, each substantially at the twist portion, each: pair" of Y portions of attachment to: corresponding ends of said bracing arms engaging a pair of opposite faces of respective beams from and outwardly of said crosspiece -.lines-towards the ends of said attachment; portions; andsecuring means; passing through the openings in said attachment portions in retaining engagement with said:
beams: y
I EMIL C, MEULENBERGH.
Metal Or Wood Cross Bridging
If the wooden deck was installed carelessly and is hanging below the bottom of the joists, then I would pull out the nails and saw it off a bit shorter and re-nail it without loosening the top.# Video | Metal Bridging For Floor Joists
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