Flat Roof Guideline Recommendations for Repair Applications

According to the Flat Roof Guideline, corrosion-resistant fasteners should be used in repairs when fasteners are screwed through existing thermally insulated roof assemblies. No statement is made on the widespread use of corrosion-resistant fasteners. We recommend the use of corrosion-resistant fasteners for repairs in bituminous or soaked roof structures.

How Technical Roofing Regulations Should Be Interpreted

Often the modal verbs used are a cause for discussion. 

What Does ‘Should’ Mean Within Roofing Standards and Guidelines?

Here we need to point out that the verb "should" usually means that a voluntary commitment is assumed. It is therefore a regulation which the German Association for the Roofing Trade imposes on itself as the publisher of the "Specialist Rules for Waterproofing." It should also be clear to everyone how an independent expert will react in the event of damage if this rule is deviated from.