basement-waterproofing

16 articles

• Basement Conversion Building Regs: Parts A, B, C, F and Structural Engineer Involvement
  Parts A/B/C/F/K/L/P engagement, escape windows 0.33m², protected stairs >4.5m below, Party Wall Act 3m/6m triggers, structural engineer mandatory
• Basement Floor Waterproofing: Bonded Sheet Membrane, Liquid-Applied Systems and Screed Specification
  Floor membrane systems: Type A bituminous/cementitious for new build, Type C cavity drain for existing, 75-100mm screed BS EN 13813, anhydrite incompatibility with bituminous walls
• Basement Retaining Wall Design: Temporary Works, Lateral Earth Pressure, Waterproofing and Drainage
  Eurocode 7 design, at-rest vs active earth pressure, 250-300mm RC walls typical, integral Type B + cavity Type C combined for Grade 3, BS 5975 temporary works
• Basement Ventilation Requirements: Part F, Humidity Control, Mechanical Ventilation Options and Condensation Risk
  Approved Document F 2022 ventilation, MVHR for habitable basements, 40-65% RH humidity target, dehumidifier 10-25 l/day, condensation on cold CDM cavity
• Basement Wall Waterproofing: Cementitious Coatings, Crystalline Systems and Render-Based Approaches
  Wall waterproofing: cementitious slurry (Vandex Super), crystalline systems (Penetron) for sound concrete, render-based traditional, Type C cavity drain for existing
• Basement Waterproofing Failure Diagnosis: Active Leaks vs Condensation, Crack Injection and Remedial System Options
  Plastic patch test, salt analysis, calcium carbide moisture, PU resin crack injection, Type C retrofit drained cavity, distinguishing condensation from ingress
• BS 8102 Type A, B and C Waterproofing: Barrier, Structurally Integral and Drained Cavity — When to Use Each
  BS 8102:2022 Type A (barrier), Type B (structurally integral), Type C (drained protection), combined systems for Grade 3+ habitable basements
• BS 8102 Warranty Requirements: What Guarantees Cover, Insurance-Backed Warranties and Specifier Responsibilities
  IBG 10-year insurance-backed cover, QANW/GPI/BLP underwriters, PCA/BWPDA member precondition, Form of Acceptance, annual maintenance to keep warranty valid
• BS 8102 Waterproofing Design: Types A, B and C, Grades and Drained Cavity Systems
  BS 8102:2022 below ground waterproofing: Types A/B/C (barrier, structurally integral, drained cavity), Grades 1/2/3; CSSW-qualified specialist mandatory; Grade 3 habitable needs combined systems; sump pump with battery backup
• BWPDA and PCA Membership: Why Clients Should Use Registered Contractors and What Guarantees Cover
  Property Care Association (PCA) membership, CSRT/CSSW qualifications, 10-year insurance-backed guarantees (GPI, QANW), BWPDA legacy body merged into PCA 2007
• Cavity Drain Membrane Systems: Floor and Wall Membrane, Studded Profile, Sump Pump Sizing and Drainage Channel
  Internal Type C cavity drain: 8mm HDPE membrane, drainage channel, sump and pump, dual pump + battery backup for Grade 3 habitable
• External Tanking Systems: Cementitious Slurry, Sheet Membranes, Drainage Board and Drainage Layer Details
  External Type A tanking: cementitious slurry (Vandex), bituminous sheet (Sika Bituthene), HDPE (Newton), drainage layer + perimeter pipe to soakaway
• Groundwater Risk Assessment for Basements: Ground Investigation, Hydrostatic Pressure and Design Water Table
  BS 8102:2022 ground investigation, design water table, hydrostatic pressure calc, perched water risk, CSSW Specialist documented assessment for warranty
• Structural Waterproofing Design: BS 8102 Grade 1–4 Usage Grades, Specifying the Right System for the Conversion
  BS 8102 Grade 1-4 specification: Grade 1 utility, Grade 3 habitable (most basement conversions), Grade 4 high-spec, CSSW competent person required
• Sump Pump Selection: Submersible vs Pedestal, Single vs Dual Pump, Capacity Calculation and Battery Backup
  Submersible pumps 80-200 l/min residential, dual pump configuration, 12V 100Ah battery backup 2-4 hour runtime, GSM/SMS alarms, annual maintenance
• Waterproofing Existing Basements: Survey Process, Identifying Failure Points and System Selection Based on Access
  CSSW survey process, identifying failure modes (failed tanking, perched water, condensation, plumbing), Type C dominant for retrofits, £45k typical conversion cost