Demonstrate fundamental building skills – Installing above ground drainage systems — Excellence, Achievement & Learning Limited Occupational Qualification Construction & Building Services Revision
This element covers the essential practical skills for installing above ground drainage systems, including preparation, pipe measurement, cutting, jointing
Topic Synopsis
This element covers the essential practical skills for installing above ground drainage systems, including preparation, pipe measurement, cutting, jointing, and final testing. Learners will develop competence in handling PVCu and other common materials, ensuring installations meet current building regulations and water authority standards.
Key Concepts & Core Principles
- Health and Safety: Understand risk assessments, personal protective equipment (PPE), and emergency procedures to prevent accidents on site.
- Tool Identification and Use: Know the names and purposes of hand tools (e.g., hammer, saw, spirit level) and power tools (e.g., drill, sander), and how to use them safely.
- Basic Construction Techniques: Perform simple tasks like measuring and marking out, cutting materials (wood, block, or brick), and assembling components using nails, screws, or adhesive.
- Material Knowledge: Recognise common construction materials (e.g., timber, bricks, concrete blocks, plasterboard) and their properties, such as strength, durability, and weight.
- Environmental Awareness: Understand waste management, recycling, and how to minimise environmental impact on a construction site.
Exam Tips & Revision Strategies
- Always check the system layout drawing before starting and mark pipe routes clearly to avoid errors.
- Double-check all measurements and dry-fit components before applying solvent cement to ensure correct alignment.
- When pressure testing, monitor for at least 5 minutes and check all joints methodically.
- Ensure waste pipes are adequately clipped and supported at the required centres to prevent sagging.
- Familiarise yourself with the relevant British Standards and Water Regulations that apply to above ground drainage.
Common Misconceptions & Mistakes to Avoid
- Applying insufficient or uneven solvent cement, leading to weak or leaky joints.
- Cutting pipes without deburring the edges, causing poor joint penetration and potential blockages.
- Forgetting to allow for thermal expansion when installing long runs of pipework.
- Installing pipework with inadequate fall, resulting in slow drainage and future blockages.
- Mixing up push-fit and solvent weld fittings, leading to system failure during testing.
Examiner Marking Points
- Award credit for selecting appropriate pipe sizes and fittings according to the given specification and layout.
- Award credit for demonstrating correct use of PPE and safe handling of hazardous substances (solvent cement).
- Award credit for achieving required fall/gradient on horizontal pipe runs without visible sagging.
- Award credit for successfully passing a leakage test with no visible drips or pressure loss.
- Award credit for thorough cleaning of pipework and removal of debris from the installation.