Copestones form the protective and aesthetic top course of a dry stone wall, shielding the underlying structure from weather ingress and animal damage. Pro
Topic Synopsis
Copestones form the protective and aesthetic top course of a dry stone wall, shielding the underlying structure from weather ingress and animal damage. Proper selection, setting and securing of these stones ensures long-term wall stability and a neat, professional finish, reflecting the craft skills assessed in the Lantra Level 1 qualification. This subtopic focuses on practical techniques to achieve a durable copestone layer without the use of mortar, emphasising interlocking, wedging and alignment.
Key Concepts & Core Principles
- Stone selection: Choosing the right stones for different parts of the wall (e.g., foundation stones, throughstones, and top stones) based on size, shape, and weight.
- Wall construction: Building a wall in layers, ensuring each course is level and properly bonded, with throughstones tying the two faces together for stability.
- Drainage and foundation: Preparing a solid foundation with good drainage to prevent frost heave and water damage, often using a base of larger stones.
- Health and safety: Using personal protective equipment (PPE) like gloves, safety glasses, and steel-toe boots; lifting techniques to avoid injury; and working safely on uneven ground.
- Tools and equipment: Identifying and using basic tools such as a walling hammer, chisel, and spirit level, and maintaining them in good condition.
Exam Tips & Revision Strategies
- Before placing a copestone, test its fit in the intended position to check stability and make any necessary adjustments to the wall top.
- Use gravity and friction to your advantage by orienting stones with their heaviest face downwards and ensuring at least three points of contact.
- Think of copestone placement as a sequential process: start from one end, work methodically, and regularly step back to assess alignment and consistency.
- During practical assessment, verbally justify your choice of each copestone, referencing its weight, shape, and weathering properties.
- Always check levels using a spirit level and string line before and after placing copestones; adjust pinning stones incrementally.
- Demonstrate safe handling and manual lifting techniques when moving heavy copestones into position.
- Show awareness of regional variations (e.g., vertically set copes in the Pennines) even if using a generic style, to display depth of knowledge.
Common Misconceptions & Mistakes to Avoid
- Failing to recognise the importance of overlapping joints in copestones, leading to vertical breaks that weaken the wall top.
- Using copestones that are undersized or poorly shaped, resulting in insufficient coverage and potential dislodgement.
- Neglecting to securely wedge or pin copestones, causing them to shift when subjected to weight or livestock pressure.
- Not checking for level across each stone and along the entire course, leading to an unprofessional finish and water pooling.
- Selecting copestones that are too thin or poorly shaped, leading to inadequate overhang and water seepage into the wall core.
- Failing to bed copestones on a level, well-prepared surface, causing instability or uneven appearance.
Examiner Marking Points
- Award credit for demonstrating an understanding of the dual purpose of copestones: protection from water penetration and improved visual appearance.
- Award credit for selecting copestones of appropriate size, shape and weight that span the wall width and tie inner and outer faces together.
- Award credit for setting copestones level and securely, using wedging stones or chock stones to eliminate wobble and create uniform bedding.
- Award credit for achieving consistent projection (overhang) where specified, and maintaining a continuous top line along the wall section.
- Award credit for demonstrating accurate identification of copestone types (e.g., through-stones, tie-stones) and their specific functions.
- Candidate must show ability to select appropriately sized and shaped stones that interlock and shed water effectively.
- Assessor to check that copestones are set firmly, with voids filled using smaller pinning stones, and that stability is tested by hand.
- Evidence of securing copestones using traditional methods such as pinning, wedging, or gravity-based interlock, without reliance on mortar.