Section 0 Guidance

  1. Introduction

    Introduction

    1.1 In the Secretary of State's view the requirements of A1 and A2 will be met by following the recommendations given in the documents listed in Section 1 or by adopting the guidance in Sections 2-4:

    • a. Section 1 is relevant to all building types and lists Codes, Standards and other references for structural design and construction but, where they do not give precise guidance, consideration should be given to paragraph 0.2.
    • b. Section 2 give sizes of structural elements for certain residential buildings and other small buildings of traditional construction.
    • c. Section 3 gives guidance on the support and fixing of wall cladding.
    • d. Section 4 gives guidance where roofs are to be re-covered as a material alteration as defined in the Regulations.
    1.2 The safety of a structure depends on the successful combination of design and completed construction, particularly:
    • a. The design should be based on identification of the hazards to which the structure is likely to be subjected and assessment of the risks. The selection of relevant critical situations for design should be made reflecting the conditions that can reasonably be foreseen during future use.
    • b. Loading. Dead load, imposed load and wind load should be in accordance with the current Codes of Practice referred to in section 1 of this document.
    • c. Properties of materials.
    • d. Detailed design and assembly of the structure.
    • e. Safety factors.
    • f. Workmanship.
    The numeric values of safety factors, whether expressed explicitly or implicitly in design equations, or design values, should be derived from considerations of the above aspects of design and construction as a whole. A change in any one of these aspects may disturb the safety of the structure. Loads used in calculations should allow for possible dynamic, concentrated and peak load effects that may occur. 1.3 Grandstands and structures erected in places of public assembly may need to sustain the synchronous or rhythmic movement of numbers of people. It is important to ensure that the design of the structure takes these factors into account so as to avoid the structure being impaired or causing alarm to people using the structure. Guidance on the design and testing of grandstands may be found in 'Dynamic performance requirements for permanent grandstands subject to crowd action – Recommendations for management, design and assessment' published by The Institution of Structural Engineers, December 2008.

    • 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