Erect scaffolding for safe working access.
Take off Hips and clean off and put aside for Re-use
Take off Slates and put aside for Re-use.
Strip old Felt and batten Remove from site
Rip out old Valley and dispose off.
Re-line new GRP Valley
Apply new breathable Felt.
Gauge battens with 25X50 batten
Re-use the existing slates for slating
Apply a Dry fix system to the re-used hips
Clear all gutting
Check all downpipes on guttering are free flowing
Remove all debris from site.