Civil Quality Inspection Checklist Hold & Witness Included PDF / Word / Excel

Waterproofing Membrane Inspection Checklist Template

Q: How long must a waterproofing flood test be maintained?

Under ASTM D5957 and standard architectural specifications, the flood test must be maintained with at least 50mm of standing water for a minimum of 48 hours continuously. Periodic inspection of the soffit underside is recorded every 12 hours.

Q: What is the purpose of angle fillets (cants) at wall-to-floor intersections?

Bituminous and elastomeric membranes cannot tolerate sharp 90-degree right angles without creasing and tearing under structural movement. A 50mm x 50mm mortar fillet cant transitions the membrane smoothly across the plane change.

Q: What type of waterproofing is recommended for below-grade basements with high water tables?

For deep basements under hydrostatic pressure, BS 8102 recommends a combined approach: Type A barrier protection (dual-layer SBS/composite membrane with protection board) alongside Type B structural water-resistant concrete with crystalline admixtures and waterstops.

A Waterproofing Membrane Inspection Checklist ensures below-grade basement walls, foundation footings, and exposed roof slabs remain completely impervious to groundwater ingress and moisture dampness. Governed by ASTM D6163, BS 8102, and manufacturer technical recommendations, this checklist enforces surface preparation roughness, moisture content testing, primer application, torch-applied SBS/APP bituminous membrane laps, detailing around pipes, and the mandatory 48-hour standing flood test.

Audit-Ready Inspection Matrix & Intervention Points

Standard civil/MEP inspection stages with contractor, consultant, and client intervention codes. Free to reference or export:

Item	Stage	Inspection Activity / Checkpoint	Roles (C / E / O)	Reference Standard	Acceptance Criteria & Tolerances	Responsibility
1.1	Surface Preparation	Substrate Cleaning, Tie-Rod Cone Grouting & Sharp Protrusion Grinding	H W R	BS 8102 / ASTM D4258	Surface smooth, free of fins, honeycombs, grease and dust; tie-rod holes plugged with non-shrink mortar	Civil QC Inspector
1.2	Surface Moisture	Concrete Substrate Moisture Content Test Prior to Priming	H W S	ASTM D4263 (Plastic Sheet Method)	Moisture content <= 4% using calibrated moisture meter or zero condensation under 24h taped polyethylene	Waterproofing Specialist & QC
2.1	Corner Detailing	Installation of 50x50mm Angle Fillets (Cants) at All Wall-to-Floor Junctions	H W S	Manufacturer Specification	Continuous 50mm mortar chamfer at all 90° internal corners to prevent membrane stress tears	Waterproofing Foreman & QC
2.2	Primer Application	Bituminous Primer Application Coverage & Drying Time Verification	W W S	ASTM D41	Uniform coverage >= 0.25 lit/m²; completely tack-free and dry before membrane torching commences	Waterproofing Inspector
2.3	Membrane Torching	SBS/APP Modified Bituminous Membrane (4mm) Torch-Welding & Alignment	H H W	ASTM D6163 / ASTM D6164	Membrane fully bonded with continuous bitumen bleed-out along edge; zero air bubbles, wrinkles or bridging	Waterproofing Specialist & QC
2.4	Laps & Seams	Side Lap (100mm) and End Lap (150mm) Heat Sealing & Trowel Pressing	H H W	ASTM D6163 Section 7	Side laps >= 100mm, end laps >= 150mm; seams sealed and chamfered with heated trowel; zero unbonded flaps	Waterproofing QC & Consultant
2.5	Pipe Penetrations	Flashing Sleeves, Double Membrane Reinforcement & Clamping Rings	H H W	Approved Waterproofing Detail	Pipe wrapped with two extra collar layers extending 150mm up pipe; stainless steel jubilee clip clamped	Civil QA/QC & Consultant RE
3.1	Quality Verification	48-Hour Water Flood Testing for Roof Slabs & Balconies	H H H	ASTM D5957	Standing water maintained at 50mm depth for 48 hours; zero dampness, damp stains, or leaks on soffit underside	Contractor QC, Consultant & Client
3.2	Protection	Protection Board (Bituboard) or Dimpled Drainage Sheet Installation	H W S	Project Technical Specs	3.2mm asphaltic protection board bonded immediately over membrane before soil backfilling operations	Civil Foreman & QC Inspector

Role Key: H Hold Point: Mandatory sign-off required W Witness Point: Formal notification (inspect if present) R Review: Certificate / Submittal check S Surveillance: Continuous audit check

Applicable Standards & Codes

BS 8102: Code of Practice for Protection of Below Ground Structures Against Water from the Ground
ASTM D6163: Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials
ASTM D5957: Standard Guide for Flood Testing Horizontal Waterproofing Installations
ASTM D41: Standard Specification for Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing
DIN 18195: Waterproofing of Buildings

Common Site QA/QC Mistakes

Torching bituminous membrane over green or damp concrete (> 4% moisture), generating trapped steam blisters that debond.
Omitting 50mm mortar fillet cants at 90-degree internal wall-to-floor junctions, causing the membrane to crack under stress.
Allowing construction traffic or backfill rocks to puncture the membrane without installing asphaltic protection boards.
Insufficient side laps (< 100mm) or failure to seal edges with a heated trowel, allowing water capillary tracking.
Skipping the mandatory 48-hour flood test before pouring the screed topping or installing thermal insulation.

Technical Frequently Asked Questions

How long must a waterproofing flood test be maintained?

Under ASTM D5957 and standard architectural specifications, the flood test must be maintained with at least 50mm of standing water for a minimum of 48 hours continuously. Periodic inspection of the soffit underside is recorded every 12 hours.

What is the purpose of angle fillets (cants) at wall-to-floor intersections?

Bituminous and elastomeric membranes cannot tolerate sharp 90-degree right angles without creasing and tearing under structural movement. A 50mm x 50mm mortar fillet cant transitions the membrane smoothly across the plane change.

What type of waterproofing is recommended for below-grade basements with high water tables?

For deep basements under hydrostatic pressure, BS 8102 recommends a combined approach: Type A barrier protection (dual-layer SBS/composite membrane with protection board) alongside Type B structural water-resistant concrete with crystalline admixtures and waterstops.

Waterproofing Membrane Inspection Checklist Template

Audit-Ready Inspection Matrix & Intervention Points

Applicable Standards & Codes

Common Site QA/QC Mistakes

Technical Frequently Asked Questions

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