Basement Damp Check – Find the causes & ventilate correctly | PDF, fillable & Excel

Basement damp or musty? 48 checkpoints with a traffic light, 8 causes with sources, a findings list, a measurement diary and a ventilation table – plus an Excel file that calculates absolute humidity and dew point itself.

Damp basement, musty smell, white marks on the wall? Damp in a basement can have many causes: condensation from ventilating at the wrong time in summer, missing waterproofing, water from outside, backflow from the sewer or a leaking pipe. This check helps you recognise the signs in an orderly way, record every damp spot, measure for one to two weeks and see whether ventilating makes your basement drier or damper. That way you go to professionals – or to the next viewing – well prepared.

How the traffic light works

• 🟢 dry: no signs of damp, nothing unusual

• 🟡 suspicious: signs of damp – note, photograph, measure and observe

• 🔴 professionals: wet spots, standing water, mould, water from outside or danger – call in professionals

What makes this check different

• ✅ Written for non-experts: three steps – prepare, walk through, observe.

• ✅ 8 typical causes, explained with sources: from summer condensation to backflow, with notes on how to recognise them.

• ✅ 48 checkpoints in 6 areas: around the house, basement walls, floor/ceiling/doors, water/sewage/backflow, air/ventilation/use, smell/mould/materials.

• ✅ Findings list: location, description, height above floor, size, photo no. and change – so you can compare later.

• ✅ Measurement diary & ventilation table: enter temperature and humidity inside and outside and check in the table (absolute humidity in g/m³) whether ventilating dries.

• ✅ Excel does the maths: absolute humidity, dew point, "ventilating dries? yes/no" and a humidity traffic light – automatically, with chart.

• ✅ Work the way you like: printed with a pen, as a fillable PDF on tablet or PC, or in Excel / Google Sheets.

What's included (17 A4 pages)

• 📋 Cover with property details and table of contents

• 📘 How to use the check: procedure, safety, what you should not do yourself

• 💧 Where basement damp comes from: 8 causes with sources

• 🗂️ Documents & questions for the seller or landlord

• ✔️ Checklist A–F: 48 checkpoints with traffic light, note and photo no.

• 📍 Findings list (15 rows)

• 🌡️ Measurement diary (20 readings inside and outside)

• 🌬️ Ventilation: when does it dry? – absolute humidity table with example

• ✏️ Basement sketch

• 🧭 Professionals & next steps, summary with result

• 📚 Notes, sources and glossary

Delivery (instant download, ZIP)

• Basement_Damp_Check_Print.pdf: for printing

• Basement_Damp_Check_Fillable.pdf: with form fields and tick boxes for tablet or PC

• Basement_Damp_Check.xlsx: property & documents, checklist with traffic-light selection, findings, measurement log with absolute humidity and dew point, summary with chart (Excel, LibreOffice, Google Sheets)

• Basement_Damp_Check_DEMO_Example.pdf and .xlsx: completed example with entirely fictitious data

• Quick_Start_Guide.pdf

Requirements: an A4 printer or a PDF app with form support, e.g. the free Adobe Acrobat Reader. For the measurement diary a simple thermo-hygrometer (measures temperature and humidity, not included). For the spreadsheet: Excel, LibreOffice or a free Google account.

Please note: This is a digital product; nothing is shipped. General information only; it does not replace an expert survey (Gutachten) and is not legal advice. The check helps you recognise, measure and document signs of damp. It does not determine a cause with certainty and is not a guide to waterproofing, renovating or removing mould – that belongs in the hands of professionals. Readings from household devices have tolerances; the thresholds in the check are guide values with a source or marked as a rule of thumb. Do not break open or open up anything – only look and document. The sources cited are German and remain in German; the German version is authoritative. Licence for personal use only: printing for your own house or viewing is allowed, passing on and reselling are not. Some preview images show fictitious example data. © 2026 Vorlagen Studio – alle Rechte vorbehalten.

Right of withdrawal: for digital content the right of withdrawal expires early under § 356 Abs. 6 Nr. 2 BGB once the download starts with your express consent and acknowledgement; details in the shop's withdrawal policy (Widerrufsbelehrung).

Hinweis zur Umsatzsteuer: Gemäß § 19 UStG wird keine Umsatzsteuer berechnet (Kleinunternehmerregelung).

(VAT note: In accordance with § 19 UStG (German VAT Act), no VAT is charged – small business regulation.)