Slate roofing · A focused guide
What if slates keep slipping in different parts of the roof?
Published by Big Ben Roofing Ltd
Repeated slipping in separate positions warrants a review of the pattern, rather than assuming each new gap has the same isolated cause. The slates, their fixings and supporting details need assessment across the affected area. Provide a timeline of earlier repairs and identify where each occurred. Ask whether the evidence supports further local repairs, an investigation of a larger section or a different scope before committing to repeated patching.
Map the repairs you know about
Use a simple sketch of the front, rear and side slopes to mark earlier work. Approximate locations are useful; you do not need roof measurements. Add dates, invoices and whether the same position moved again or a new location was involved. This separates a recurring local fault from several unrelated observations and gives the roofer a clearer question to investigate.
Ask what evidence changes the recommendation
A recommendation for more extensive work should relate to findings and inspection limits. Ask what has been checked beyond the latest slipped slate and which parts remain concealed. If opening a sample area is suggested, agree its extent and how it will be reinstated. Any broader proposal should explain retained covering, replacement materials and the treatment of connected roof junctions.
Useful details to record
- List the dates and approximate positions of previous slate repairs.
- Distinguish repeat movement at one position from new gaps elsewhere.
- Share photographs already taken before and after earlier work.
- Ask which findings justify extending the repair beyond the latest defect.
Use information already available from indoors or ground level. Do not climb onto the roof or disturb materials to complete this checklist.
Is repeated slate movement always caused by corroded nails?
No single cause should be assumed from movement alone. Fixing condition is relevant, but slate damage, supporting details and previous work may also need investigation. Ask the roofer to explain the evidence for the diagnosis.
Background reading
- CUPA PIZARRAS: project-specific slate fixing specifications
- SPAB: maintaining slate, tile and metal roofs
General guidance helps frame the questions. The cause, suitable materials and scope depend on inspection of the particular roof.
Related questions
Can a slipped slate be repaired if it is not broken?
Understand what a slipped but apparently intact slate means for fixing condition, adjoining slates and the boundary of a local repair.
How should a quotation allow for salvaged slates and replacements?
Ask for a transparent slate inventory, replacement allowance and approval process when a larger repair intends to retain existing covering.
Discuss what you have noticed
Include your postcode, the affected roof section and when the concern appears. The team will review the enquiry and confirm the next step, scope and availability.
Request a roofing assessment