Structure: Approved Document A

O N L I N E V E R S I O N A1/2 Section 2C: Thickness of walls in certain small buildings Application e. the guidance given is based upon the compressive strengths of bricks and blocks 2C1 This section applies to the following being not less than indicated in Tables 6 and 7. building types: BS EN 1996-1-1:2005 with its UK National a. residential buildings of not more than Annex gives design strengths for walls where three storeys; the suitability for use of masonry units of other b. small single-storey non-residential compressive strengths is being considered. buildings; Conditions relating to the building c. small buildings forming annexes to of which the wall forms part residential buildings (including garages and outbuildings). 2C4 This section applies only to buildings having proportions within the following Wall types parameters (see Diagrams 1 and 2): 2C2 Only the types of wall given in Table 2, a. residential buildings of not more than which must extend to the full storey height, and three storeys: parapet walls are considered in this section. i. the maximum height of the building The use of this section measured from the lowest finished ground level adjoining the building to the highest 2C3 When using this section it should be point of any wall or roof should not be noted that: greater than 15m, subject to the limits a. this section must be used in conjunction of paragraph 2C16; with section 2A; ii. the height of the building H should not b. if wall thickness is to be determined exceed twice the least width of the according to paragraphs 2C5 to 2C13, all building W1; appropriate design conditions given in this iii. the height of the wing H2 should not section must be satisfied; exceed twice the least width of the wing c. walls should comply with the relevant W2 where the projection P exceeds twice requirements of BS EN 1996-2:2006 with its the width W2; UK National Annex and additional guidance b. small single-storey non-residential buildings: given in BSI Published Document PD height H should not exceed 3m and W (being 6697:2010, except as regards the conditions the greatest length or width of the building) given in paragraphs 2C4 and 2C14 to 2C38; should not exceed 9m (see Diagram 2), d. in formulating the guidance of this section the subject to the limits of paragraph 2C16; worst combination of circumstances likely to c. annexes: height H as variously indicated in arise was taken into account. If a requirement Diagram 2 should not exceed 3m, subject to of this part is considered too onerous in a the limits of paragraph 2C16. particular case it may be appropriate to consider a minor departure on the basis of judgement and experience, or to show adequacy by calculation in respect of the aspect of the wall which is subject to the departure rather than for the entire wall; Table 2 Wall types considered in this section Residential buildings of up to three storeys External walls Internal load-bearing walls Compartment walls Separating walls Small single-storey non-residential buildings and annexes External walls Internal load-bearing walls Approved Document A Structure O N L I N E V E R S I O N 13