Hapm Publications Ltd. 
HAPM Component Life Manual [PDF ebook] 

This publication breaks new ground. It is the first document to provide extensive life-span assessments (for insurance purposes) for a wide range of building components which are classified within the concept of quality specifications. A further benefit is that it does not seek to be prescriptive. It indicative “benchmarks“ against which new or differing specifications can be assessed, in that sense it is both robust and flexible.