A roof upstand is a raised component beside a roof plane where waterproofing connects or continues upwards. Upstands occur at different building elements. Their role and arrangement need to be described in relation to the selected roof assembly rather than in isolation.
When insulation or covering changes, the space available at an existing upstand may change. Ask how new layers connect to walls, rooflights or other raised components. A general photograph cannot provide reliable dimensions for that junction or establish its suitability.
This explanation provides no universal minimum height. The selected system and actual situation require appropriate assessment. Record which upstands will be retained, adapted or renewed and which junctions belong to the same instruction so the scope remains identifiable throughout preparation.
Worth asking
Frequently asked questions
Can an existing upstand always remain?
That cannot be established generally. Have its relationship with the proposed layers assessed.
Is an upstand only a visible edge?
No. The connection of the waterproofing belongs in the assessment.