Structural use of timber. Recommendations for the calculation basis for span tables - Purlins supporting sheeting or deckingBS 5268 7. 7: 1990 recommends a calculation basis for the permissible clear span of purlins supporting sheeting or decking in pitched roof construction. The recommendations apply to purlins formed from solid timber and supported by external or internal walls. The major axis of the purlin is perpendicular to the roof slope; other orientations of the purlin are not covered by this standard. The uniform and concentrated loads of BS 6399 1 are considered.

It is available with various wall thicknesses and also in a higher shrink ratio according to the application and degree of mechanical protection required

This document specifies requirements for:

Engineering

endurance tests and thermal tests

in the manufacturing of precision machines and in medical operations

a part of the BS EN 485 series

and BS ISO/IEC 29794 defines and specifies methodologies for objective

Society’s expectations of organizational behaviours and performance are growing

ISO 22285 is used to predict the behaviour of greases on storage in pails and drums

Where the scope of an organization’s activities includes areas other than computer software development

Its purpose is to create a platform for global interoperability

These aspects reside in EN 1997‑1 or its national annex for CEN countries and in similar national application documents for this test standard for ISO countries