Spire & Turret Roofing in Lead: Advanced Detailing Guide
Spires and turrets are challenging roof forms, combining steep pitches with curved or faceted geometry. Correctly detailed spire roofing in lead provides both durability and dramatic architectural impact. This guide explains bay layout, rolls, decorative joints and finishing in line with Leadwork Standards.
1. Code Selection
Spires and turrets require heavy codes for stability. Code 6 is the minimum, with Code 7 often specified on tall or exposed structures.
2. Bay Layout
Divide the spire or turret into vertical bays, typically using wood-cored rolls to form the joints. Bays should be no wider than 1 m, tapering towards the top. Each bay must overlap correctly at joints to shed water.
3. Decorative Rolls & Joints
Decorative standing rolls are often specified on heritage spires. They provide both function (movement joints) and form (visual rhythm). Rolls should be evenly spaced and aligned with architectural features below.
4. Detailing at the Apex
The spire or turret apex requires a carefully bossed cap or finial. Joints must be welted and soldered where necessary. This is a common failure point if detailing is poor.
5. Finishing & Maintenance
Apply patination oil to all exposed areas. Regular inspection is vital, as wind exposure and thermal movement are significant on spires.
FAQs
What lead code is best for spires?
Code 6 minimum, with Code 7 often specified for tall or exposed spires.
How are spire bays divided?
Into vertical bays no wider than 1 m, separated by wood-cored rolls or standing rolls for expansion and decoration.
Do spires need decorative rolls?
They are often specified for heritage aesthetics. Rolls also function as expansion joints, so they are both decorative and functional.
How is the apex of a spire detailed?
With a bossed lead cap or finial, welted or soldered at joints to ensure waterproofing.
Do spires need regular maintenance?
Yes. Spires are exposed to extreme weather. Inspect regularly for movement, cracking, or failed joints.
Next in the series (Post 15): Ogee Domes in Lead — complex curvature, bay setting-out and decorative finishes.
