Section 2 Sizes of structural elements for certain residential buildings and other small buildings of traditional construction

Sizes of structural elements for certain residential buildings and other small buildings of traditional construction

  1. General
    1. Section 2a
      1. Section 2b
        1. Section 2c
          1. Section 2d
            1. Section 2e
            2. Definitions
              1. Buttressing wall
                1. Cavity width
                  1. Compartment wall
                    1. Dead load
                      1. Imposed load
                        1. Pier
                          1. Separating wall
                            1. Spacing
                              1. Span
                                1. Supported wall
                                  1. Wind load

                                  General

                                  2.1 This section is presented as follows:

                                   

                                  Section 2a

                                  Basic requirements for stability.

                                  Section 2b

                                  Sizes of certain timber members in floors and roofs for dwellings.
                                  Areas at risk from house longhorn beetle.

                                  Section 2c

                                  Thickness of masonry walls in certain residential buildings of not more than three storeys, small single-storey non-residential buildings and annexes.

                                  Section 2d

                                  Proportions for masonry chimneys.

                                  Section 2e

                                  Foundations of plain concrete.

                                  Definitions

                                  2.3The following meanings apply to terms throughout this section:

                                  Buttressing wall

                                  A wall designed and constructed to afford lateral support to another wall perpendicular to it, support being provided from the base to the top of the wall.

                                  Cavity width

                                  The horizontal distance between the two leaves of a cavity wall.

                                  Compartment wall

                                  A wall constructed as a compartment wall to meet the requirements of regulation B3(2).

                                  Dead load

                                  The load due to the weight of all walls, permanent partitions, floors, roofs and finishes including services, and all other permanent construction.

                                  Imposed load

                                  The load assumed to be produced by the intended occupancy or use, including the weight of movable partitions, distributed, concentrated, impact, inertia and snow loads, but excluding wind loads.

                                  Pier

                                  A member which forms an integral part of a wall, in the form of a thickened section at intervals along the wall, so as to afford lateral support to the wall to which it is bonded or securely tied.

                                  Separating wall

                                  A wall or part of a wall which is common to adjoining buildings, and constructed to meet the requirements of regulation B3(2).

                                  Spacing

                                  The distance between the longitudinal centres of any two adjacent timber members of the same type, measured in the plane of floor, ceiling or roof structure.

                                  Span

                                  The distance measured along the centre line of a member between the centres of any two adjacent bearings or supports.

                                  Supported wall

                                  A wall to which lateral support is afforded by a combination of buttressing walls, piers or chimneys acting in conjunction with floor(s) or roof.

                                  Wind load

                                  The load due to the effect of wind pressure or suction.

                                  • 1 Size and proportion of residential buildings of not more than three storeys Diagram 1 Size and proportion of residential buildings of not more than three storeys
                                  • 2 Size and proportion of non-residential buildings and annexes Diagram 2 Size and proportion of non-residential buildings and annexes
                                  • 3 Determination of wall thickness Diagram 3 Determination of wall thickness
                                  • 4 Parapet walls - height Diagram 4 Parapet walls - height
                                  • 5 Maximum floor area enclosed by structural walls Diagram 5 Maximum floor area enclosed by structural walls
                                  • 6 Fig 1-2 - Map showing wind speeds in m per s for maximum height of buildings Diagram 6 Fig 1-2 - Map showing wind speeds in m per s for maximum height of buildings
                                  • 6 Fig 3 - Map showing wind speeds in m per s for maximum height of buildings Diagram 6 Fig 3 - Map showing wind speeds in m per s for maximum height of buildings
                                  • 7 Max height of buildings Diagram 7 Max height of buildings
                                  • 8 Measuring storey and wall heights Diagram 8 Measuring storey and wall heights
                                  • 9 Declared compressive strenght of masonry units Diagram 9 Declared compressive strength of masonry units
                                  • 10 Maximum span of floors Diagram 10 Maximum span of floors
                                  • 11 Differences in ground levels Diagram 11 Differences in ground levels
                                  • 12 Openings in a buttressing wall Diagram 12 Openings in a buttressing wall
                                  • 13 Buttressing Diagram 13 Buttressing
                                  • 14 Sizes of openings and recesses Diagram 14 Sizes of openings and recesses
                                  • 15 Lateral support by floors Diagram 15 Lateral support by floors
                                  • 16 Lateral support at roof level Diagram 16 Lateral support at roof level
                                  • 17 Size and location of openings Diagram 17 Size and location of openings
                                  • 18 Wall thinckness Diagram 18 Wall thinckness
                                  • 19 Lateral restraint at roof level Diagram 19 Lateral restraint at roof level
                                  • 20 Proportions for masonty chimneys Diagram 20 Proportions for masonry chimneys
                                  • 21 Elevation of stepped foundation Diagram 21 Elevation of stepped foundation
                                  • 22 Piers and chimneys Diagram 22 Piers and chimneys
                                  • 23 Foundation dimensions Diagram 23 Foundation dimensions
                                  • 24 Area at risk of collapse in the event of an accident Diagram 24 Area at risk of collapse in the event of an accident
                                  • Table 1 Areas at risk from house longhorn beetle Table 1 Areas at risk from house longhorn beetle
                                  • Table 2 Wall types considered in this section Table 2 Wall types considered in this section
                                  • Table 3 Minimum thickness of certain external walls, compartment Table 3 Minimum thickness of certain external walls, compartment
                                  • Table 4 Imposed loads Table 4 Imposed loads
                                  • Table 5 Cavity wall ties Table 5 Cavity wall ties
                                  • Table 6 Declared compressive strength of masonry units complying with BS EN 771-1 TO -5 [N PER nn SQ] Table 6 Declared compressive strength of masonry units complying with BS EN 771-1 TO -5 (N/mm SQ)
                                  • Table 7 Normalised compressive strength of masonry units of clay and calcium silicate blocks complying with BS EN 771-1 and 2 [Nn/mm SQ] Table 7 Normalised compressive strength of masonry units of clay and calcium silicate blocks complying with BS EN 771-1 and 2 (N/mm SQ)
                                  • Table 8 Value of Factor X - see Dia 14 Table 8 Value of Factor 'X' (see Dia 14)
                                  • Table 9 Lateral support for walls Table 9 Lateral support for walls
                                  • Table 10 Minimum width of strip footings Table 10 Minimum width of strip footings
                                  • Table 11 Building consequence Table 11 Building consequence