Cellar Waterproofing Assessment Checklist

16 items · Home · Hard difficulty · 2 hours

Assess, compare, and prepare for cellar waterproofing with this practical checklist.

• Inspect interior walls and floors for damp signs

  Look for discoloration, peeling paint, blistering or bulging plaster.

• Check for tide marks and salt deposits

  White salt stains often indicate rising damp or evaporation salts.

• Smell for musty odors and note strongest locations

  Musty smell patterns help pinpoint chronic damp areas.

• Inspect exterior for drainage, cracks, and soil levels

  Look for cracks, water pooling, and vegetation against walls.

• Clear gutters and check downspout function

  Remove debris and ensure downspouts discharge water away from the foundation.

• Ensure ground slopes away from the foundation

  Check for adequate fall so surface water moves away from walls.

• Differentiate penetrating damp versus rising damp

  Note if damp is local (penetrating) or forms a horizontal tide line (rising).

• Measure damp height and check for lateral staining

  Record max damp height and any horizontal spread or staining.

• Take labeled photos of each problem area with date

  Capture close-ups and wider context; label with date and weather conditions.

• Use or borrow a moisture meter and record readings

  Test multiple points and log percentage or scale readings for reference.

• Book a structural survey with a qualified surveyor

  Choose a RICS or certified damp/structural specialist and request a written report.

• Ask specialists for detailed written quotes

  Request scope, materials, timelines, exclusions and references from 2–3 contractors.

• Compare internal vs external tanking and note pros/cons

  Evaluate cost, disruption, access needs, lifespan and finish options.

• Evaluate sump and pump option including backups

  Check power supply, battery backup, discharge route and maintenance needs.

• Verify building regulations, permits, and required certificates

  Contact local authority about approvals, electrician sign-off and completion certificates.

• Collect and store contractor warranties, guarantees, and insurance details

  Get written warranty length, exclusions, insurer contact and proof of liability cover.

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