BS EN 771-4:2011+A1:2015
Specification for masonry units - Autoclaved aerated concrete masonry units

Standard No.

BS EN 771-4:2011+A1:2015

Release Date

2011

Published By

British Standards Institution (BSI)

Latest

BS EN 771-4:2011+A1:2015

Scope

What is BS EN 771-4 - Autoclaved aerated concrete masonry units about? BS EN 771 is a European standard that discusses the specification for masonry units. The main objective of the BS EN 771 series it to provide best industry guidance to determine the quality and performance of construction products and materials such that they contribute to the structural integrity of your civil engineering works. BS EN 771-4 is the fourth part of the series that specifies the characteristics and performance requirements of autoclaved aerated concrete (AAC) masonry units for which the main intended uses are different types of load-bearing and non-load-bearing applications in all forms of walling including single leaf, cavity, partitions, retaining, basement and general use below ground level, including walling for fire protection, thermal insulation, sound insulation and the fabric of chimneys (excluding chimney flue units). BS EN 771-4 includes AAC masonry units with incorporated insulation not exposed to fire, and masonry units of an overall rectangular parallelepiped shape, specially shaped and accessory units. AAC masonry units may consist of layers of different densities where not all of the layers are loadbearing. Note 1: BS EN 771-4 does not cover the requirements for storey height panels, flue linings and masonry units with an incorporated thermal insulation material bonded to the faces of the unit susceptible to be exposed to fire. Note 2: BS EN 771-4 does not specify standard sizes for autoclaved aerated concrete units nor standard work dimensions and angles of specially shaped and accessory units. Note 3: BS EN 771-4 does not give permissible deviations for specially shaped and accessory units.

BS EN 771-4:2011+A1:2015 Referenced Document

• EN 1052-2 Methods of test for masonry - Part 2: Determination of flexural strength*， 2016-03-01 Update
• EN 1052-3 Methods of test for masonry - Part 3: Determination of initial shear strength
• EN 13501-1 Fire classification of construction products and building elements - Part 1: Classification using data from reaction to fire tests*， 2018-01-01 Update
• EN 1745 Masonry and masonry products - Methods for determining thermal properties*， 2012-04-01 Update
• EN 680 Determination of the drying shrinkage of autoclaved aerated concrete*， 2025-05-01 Update
• EN 772-16:2011 Methods of test for masonry units - Part 16: Determination of dimensions
• EN 772-1:2011 Methods of test for masonry units - Part 1: Determination of compressive strength (Incorporates Amendment A1: 2015)
• EN ISO 12572 Hygrothermal performance of building materials and products - Determination of water vapour transmission properties - Cup method - Amendment 1 (ISO 12572:2016/Amd 1:2024)*， 2024-10-16 Update

BS EN 771-4:2011+A1:2015 history

• 2011 BS EN 771-4:2011+A1:2015 Specification for masonry units - Autoclaved aerated concrete masonry units
• 2011 BS EN 771-4:2011 Specification for masonry units. Autoclaved aerated concrete masonry units
• 2003 BS EN 771-4:2003 Specification for masonry units - Autoclaved aerated concrete masonry units
• 2001 BS EN 771-4:2001 Specification for masonry units-Autoclaved aerated concrete masonry units

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