Install Curtain Walling Systems — City and Guilds of London Institute Vocationally-Related Qualification Construction & Building Services Revision
This unit focuses on the practical skills and underpinning knowledge required to install curtain walling systems correctly. Learners will assemble, adjust,
Topic Synopsis
This unit focuses on the practical skills and underpinning knowledge required to install curtain walling systems correctly. Learners will assemble, adjust, and fix curtain walling components to form a weathertight grid, ensuring structural integrity and alignment. The topic covers assembly methods, adjustment techniques, fixing procedures, tool selection, and troubleshooting common installation challenges.
Key Concepts & Core Principles
- Building Regulations Compliance: Understanding Approved Documents L (thermal performance), Part K (safety glazing), and Part B (fire safety) to ensure installations meet legal requirements.
- Structural Integrity and Fixings: Correct selection and installation of fixings, anchors, and sealants to support loads, prevent water ingress, and accommodate thermal movement.
- Surveying and Measuring: Accurate site measurement, including allowances for tolerances, reveals, and cavity widths, to ensure products fit correctly and perform as intended.
- Weatherproofing and Drainage: Proper installation of drainage channels, weeps, and seals to prevent water penetration and condensation buildup within frames.
- Health and Safety: Application of risk assessments, method statements, and safe systems of work, including working at height, manual handling, and use of PPE.
Exam Tips & Revision Strategies
- Always start answers by stating the importance of following approved installation manuals and method statements.
- When describing adjustments, reference specific tools (e.g., laser level, torque wrench) and the sequence of operations, such as plumbing verticals before fixing horizontals.
- Emphasize the need for pre-installation surveys to verify structural tolerances and substrate condition before selecting fixings.
- In problem-solving scenarios, mention checking for environmental factors like wind load during lifting and temporary bracing requirements.
Common Misconceptions & Mistakes to Avoid
- Misinterpreting setting-out drawings, leading to grid misalignment and cumulative errors.
- Using inappropriate fixings for the substrate, such as mechanical anchors in lightweight block without proper assessment.
- Neglecting to check plumb and level at each stage, resulting in a twisted frame that cannot be adjusted later.
- Over-tightening bolts and damaging pressure plates or mullions, compromising the structural seal.
- Omitting thermal isolation pads between brackets and structure, causing thermal bridging and potential condensation.
Examiner Marking Points
- Award credit for demonstrating accurate grid assembly using appropriate mullions, transoms, and pressure plates according to manufacturer’s instructions.
- Expect evidence of correct use of torque wrenches and calibrated tools to achieve specified bolt tensions without over-tightening.
- Assess ability to set out grid lines and datum points using laser levels and theodolites, ensuring vertical and horizontal alignment within tolerance.
- Require demonstration of fixing brackets to the primary structure with correct anchors (e.g., chemical, mechanical) suitable for the substrate, including edge-distance compliance.
- Confirm that thermal breaks and gaskets are installed correctly to prevent cold bridging and ensure weathertightness.
- Verify that adjustment of sliding blocks and packers achieves correct compression of gaskets and uniform joint widths.