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Understanding Floor Joists and Subflooring: Key Concepts and Types

This guide provides a comprehensive overview of floor joists and subflooring, essential structural components in construction. Floor joists support the floor, with dimensions ranging from 2x6 to 2x12, spaced typically 16 inches apart. It highlights important factors such as load types (live and dead loads) and the role of load-bearing walls. Additionally, the guide explores the need for extra support in areas like stairs and chimneys, the use of cross bridging, cantilevered joists for expanded spaces, and the significance of subflooring materials and techniques for optimal strength and stability.

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Understanding Floor Joists and Subflooring: Key Concepts and Types

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Presentation Transcript

    1. Architecture Intro to Floor Joist and Sub flooring

    2. What are Floor Joists? They provide support for the floor Their sizes range from 2x6 to 2x12 Their spans (how far apart they are spaced) range from 12 to 24

    4. Their size depends on 4 concepts: Length of the space to be covered Load to be supported Grade of the wood (specie of wood) Distance joists are spaced Normally 16 O.C.

    5. Different types of Loads on floors Live load the weight from non stationary things..people, beds, dressers, etc Live load weight is 40 lbs. Square foot Dead loadthe weight from stationary items..walls, chimneys, windows, etc Dead load weight varies

    6. What is a Load Bearing Wall? A wall that holds the weight of the house Concrete Block wall Cast concrete Frame construction

    7. Stairs and Chimneys They require more support, so double joists are used for the openings Pg 197 fig. 11-10

    8. Cross Bridging This can be used on plain wooden trusses to keep them straight over the years. (strengthen the joists) Not normal today with special types of joists being made

    10. Cantilevered Joists Produces an expanded floor space without the expanded foundation plangarrison style house Twice the overhang must be on the inside Pg 201 fig. 11-18

    12. Sub Flooring Usually 4x8 sheets Plywood grain direction at right angels to the joists Stronger Staggered Expansion joints

    13. Sub Flooring Cont. If they are glued and nailed they create: Stronger Squeak free structures

    14. Platform Framing Sill is the starting point Supports joists Normally a 2x6 Header joist all the way around The joists flush against header sitting on sill Then the sub floor is placed on top of joists

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