Roof falls are the intended gradients directing water across a surface towards a chosen route. On a roof, that direction relates to drainage and junctions. The term alone does not establish the actual gradient present or how it has been formed.
Visible water in a photograph is an observation, not a complete measurement of roof falls. Timing, location and conditions matter. Ask which roof areas were assessed and how their relationship with outlets and surrounding details was investigated during that assessment.
During renewal, the proposed assembly may affect available levels and junctions. Do not therefore leave falls as an isolated word in a quotation. A reasoned proposal explains which arrangement will remain or change and which technical assessment supports that decision.
Worth asking
Frequently asked questions
Does a puddle always prove incorrect falls?
No. The observation requires assessment in context and over time.
Does this page give a standard percentage?
No. The actual situation and selected assembly need appropriate assessment.