BS EN 771 is a series of the European standard on masonry units that is the preformed component intended for use in masonry construction.
BS EN 771-1 is the first part of the BS EN 771 series of documents that specifies the characteristics and performance requirements for masonry units manufactured from clay for which the main intended uses are protected or unprotected masonry (e.g., facing and rendered masonry, loadbearing or non-loadbearing masonry structures, including internal linings and partitions, for building and civil engineering).
BS EN 771-1 includes those clay masonry units of an overall non-rectangular parallelepiped shape.
BS EN 771-1 defines the performance related to e.g., dimensional tolerances, strength, density measured according to the corresponding test methods contained in separate European Standards.
Note 1: BS EN 771-1 does not specify standard sizes for clay masonry units, nor does it specify standard work dimensions, angles and radii of specially shaped clay masonry units. BS EN 771-1 does not include the method of measurement of angles and radii characteristics of specially shaped clay masonry units.
Note 2: BS EN 771-1 does not cover requirements for the following: units for paving, flue liners and storey height clay masonry units and clay masonry units with an incorporated thermal insulation material bonded to the faces of the unit susceptible to be exposed to fire, however, include clay masonry units for external chimney masonry.
BS EN 771-1 on masonry is useful for:
Clay masonry unit masonry is the unit made from clay or other argillaceous materials with or without sand, fuel or other additives fired at a sufficiently high temperature to achieve a ceramic bond.
The requirements for clay masonry units are specified in BS EN 771-1 in terms of the test methods and other procedures.
BS EN 771-1 outlines the physical and mechanical properties of clay masonry units.
Description, designation, designation code and classification of clay masonry units are all determined in BS EN 771-1.
The marking of units, the packaging, delivery notes or any certificate supplied with the clay masonry units is set out in BS EN 771-1.
BS EN 771-1 provides the assessment and verification of constancy of performance (AVCP) with the compliance for masonry units with the requirements and performance determination of product with the type testing and factory production control.
Furthermore, BS EN 771-1 guides you through the fabrication of clay masonry units for construction purposes, assuring durability, flexibility, energy efficiency, and low maintenance while giving your buildings an elegant appearance.
Masonry can be used for building structures because of its colour, scale, texture, pattern, and look of permanence, which controls sound, resists fire, and insulates against daily temperature variations.
EN 771-1:2011+A1:2015