British Standards Relevant to Agriculture

British Standard Summaries

BS5502: Part 75: 1993
Building and Structures for Agriculture.
Design and Construction of Forage Stores.

The text herein is not a a full reproduction of the British Standard. It is summary based upon interpretation of the original text and not intended as a replacement for the full text. It should be used for general guidance only.

BS5502 is sub-divided into a number of individual standards. These can be broadly broken down as follows:

  • Part 0: Introduction
  • Parts 10 - 19: Reference information
  • Parts 20 - 39: General designs
  • Parts 40 - 59: Livestock buildings
  • Parts 60 - 79: Crop buildings
  • Parts 80 - 99: Ancillary buildings

This part of BS5502 gives recommendations for the design and construction of forage (herbage feed for stock) stores. It does not cover forage silo towers.


  • Consideration must be given to all the appropriate legislation e.g. BS5502:11.
  • Site selection should consider flooding potential, proximity to stock housing, ease of access for handling equipment, ground bearing capacity and potential for future expansion.
  • Silage stores must be at least 10m from any controlled water. See Defra Water Code.
  • Stores should be adequately sized.
  • Buildings, structure, walls and floors should be capable of handling the maximum potential loadings.
  • Windows and doors should be bird, pest and vermin protected.
  • Details and specifications for construction materials are given in the full Standard.
  • COSHH Regulations must be complied with and assessments carried out.


  • Toxic gases can build up inside stores and so good ventilation is necessary.
  • All below-ground stores and effluent tanks should be protected against accidental entry especially by children.
  • Protection against infestations will be necessary in accordance with BS5502:30.
  • Fire precautions will be required in accordance with BS5502:23.

A British Standard nor this summary does not, necessarily, include all the necessary information for correct implementation of the Standard to any specific application. This is purely the responsibility of the user. Standards are updated by either amendment or revision. Users should ensure that they are using the latest version.

The full text of this Standard can be obtained from the British Standard Institution

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