Proudman Professional AccessExpert fire-door knowledge, diagnostic tools and technical guidance.
Proudman FIX — Diagnostic Knowledge Centre
FIX — Fault Finding Hub
A practical, evidence-led diagnostic resource for fire doors. Start with the problem you can see, answer the questions and follow the relevant checks and technical guidance.
Important: A visible mark is evidence to record, not proof of its cause. A repair that looks sound is not automatically an approved repair. Check the doorset specification and permitted method before altering or replacing material.
FIXFIXBrowse the fault-finding hub by subject and get the right technical answer.You are already here ➜
⚒InstallationGuidance on correct installation, fixing, alignment, clearances and common installation faults.Go to Installation Hub ➜
♧Diagnostic TreeUse the step-by-step diagnostic route to identify the issue and get to the right answer.You are using the tree ➜
⚒InstallationGuidance on correct installation, fixing, alignment, clearances and common installation faults.Go to Installation Hub ➜
♧Diagnostic TreeUse the step-by-step diagnostic route to identify the issue and get to the right answer.You are using the tree ➜
Start FIX — What are you investigating?
Choose a starting point below. Work from the actual symptoms and site evidence; the tree will guide the next question.
Door & closingOpening, closing, binding or latching.Start FIX →
FrameMovement, fixing, distortion or contact.Start FIX →
Door closerOperation, speed, power or latching.Start FIX →
Hinges / locks / latchesHardware, fixing or mechanical issues.Start FIX →
SealsDamage, fitting, compression or continuity.Start FIX →
GapsPerimeter, threshold or uneven clearances.Start FIX →
GlazingGlass, beads, retention or damage.Start FIX →
Damage / alterationsDrilling, trimming, cutting or changes.Start FIX →
Door leaf / constructionCore, lippings, condition or build.Start FIX →
Fire stopping / wall junctionFrame-to-wall gaps, packing or junctions.Start FIX →
Inspection / complianceEvidence, certification or assessment.Start FIX →
Inspection / existing doorUnknown specification, history or construction.Start FIX →
Maintenance / alterationServicing, repairs or remedial work.Start FIX →
Professional note: This decision tree supports investigation; it does not replace the doorset’s fire-resistance evidence, manufacturer instructions, competent inspection or a suitable assessment of the complete doorset.