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Floor moisture test record
A moisture and readiness check before laying floor coverings. Record the base and its age, the covering to be laid and the manufacturer's maximum relative humidity, and confirm the building was at normal conditions. Add each reading with its location and method: relative humidity and time under a hygrometer hood, a comparative meter reading, or a carbide or oven moisture content, with the temperature. The form shows how far each relative humidity reading is from the limit and counts those over it. Record flatness, the damp-proof membrane and the result. Every question is listed below, and you can fill the live form in on this page.
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How dry does a screed need to be for flooring?
Dry enough for the adhesive and floor covering being laid. The manufacturers give the maximum relative humidity, and where the adhesive and the covering differ the lower figure applies. BS 8203 is the British Standard code of practice for installing resilient floor coverings, and BS 8204-1 covers concrete bases and levelling screeds that receive floor coverings.
Last updated . Facts checked by the SiteSurvey team on 17 October 2026 against BSI: BS 8203, code of practice for installation of resilient floor coverings and BSI: BS 8204-1, concrete bases and cementitious levelling screeds to receive floorings.
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Every question in the floor moisture test template
A floor moisture and pre-installation survey: base type and age, conditions, relative humidity readings with a hygrometer hood, flatness, damp-proof membrane, the manufacturer's limit and whether flooring can go down. 3 sections and 38 questions. Follow-up questions and guidance appear only when an answer calls for them, so the person on site never sees the ones that do not apply.
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Details you only enter once
Add this form to a project in SiteSurvey and it fills in what the project already knows, so nobody on site retypes it and every form on the job uses the same names. Anything filled in can still be changed.
- Project: the project name
- Client: the project's customer
- Site: the site, when the form is opened for a space or a product
- Site address: the site address, from the space or the project
Base
- ProjectShort answerFills in from the project name
- ClientShort answerFills in from the project's customer
- Site*Short answerFills in from the site, when the form is opened for a space or a product
- Site addressShort answerFills in from the site address, from the space or the project
- Survey date*Date
- TimeTime
- Surveyor*Short answer
- BaseChoose one
- Sand and cement screed
- Concrete slab
- Calcium sulphate (anhydrite) screed
- Timber or board
- Existing floor covering
- Age of the base (weeks)Number
- Floor covering to be laid*Short answer
- Manufacturer's maximum relative humidity (%)Number
From the adhesive and floor covering manufacturers' data. Use the lower figure.
- Was the building at its normal service temperature and humidity, with drying equipment off, before the readings were taken?Yes or No
- CheckReadings taken while drying equipment is running may not show how wet the base will be in normal use. Say so under preparation.Shown when “Was the building at its normal service temperature and humidity, with drying equipment off, before the readings were taken?” is No
- Weather captureAnswer
Record estimated current conditions and add what you observe on site.
Readings
- ReadingsRepeat for each reading. Each one asks:
- Location*Short answer
- MethodChoose one
- Hygrometer hood (RH %)
- Moisture meter (comparative)
- Carbide or oven test
- Relative humidity (%)NumberShown when “Method” is “Hygrometer hood (RH %)”
- Meter reading and scaleShort answerShown when “Method” is “Moisture meter (comparative)”
- Moisture content (%)NumberShown when “Method” is “Carbide or oven test”
- Temperature (°C)Number
- Hood in place for (hours)Number
Hood makers and BS 8203 practice: leave the sealed hood for at least 72 hours, then read until the value is stable, or as the hood maker states.
Shown when “Method” is “Hygrometer hood (RH %)” - CheckThe hood has been in place for less than 72 hours. The reading may not have reached equilibrium yet.Shown only when the answers above make it relevant
- Difference from the limit (% RH, above 0 is too wet)Worked out by the formShown when “Relative humidity (%)” is answered and “Manufacturer's maximum relative humidity (%)” is answered
- WarningAbove the manufacturer's limit. Do not lay the floor covering yet.Shown only when the answers above make it relevant
- PhotosPhotos
- Readings takenWorked out by the form
- Hygrometer readingsWorked out by the form
- Highest relative humidity (%)Worked out by the form
- Readings over the limitWorked out by the formShown when “Manufacturer's maximum relative humidity (%)” is answered
- Readings within the limitWorked out by the formShown when “Manufacturer's maximum relative humidity (%)” is answered
- Relative humidity resultWorked out by the formShown only when the answers above make it relevant
- GuidanceCompare each relative humidity reading with the lowest limit given by the adhesive and floor covering manufacturers. BS 8203 is the code of practice for installing resilient floor coverings, and BS 8204-1 covers concrete bases and levelling screeds that receive them.
Flatness and result
- Worst gap under a 2 m straightedge (mm)Number
- Flatness limit from the specification (mm)Number
The largest gap the specification or the covering manufacturer allows under the straightedge.
- Flatness checkWorked out by the formShown only when the answers above make it relevant
- CheckThe gap is larger than the specification allows. Record the smoothing or grinding needed before the covering goes down.Shown only when the answers above make it relevant
- Damp-proof membrane present?Yes or No
- Result*Choose one
- Ready to lay
- Ready after preparation
- Not ready: too wet
- Not ready: other
- Preparation needed (smoothing, priming, surface DPM, drying time)NotesShown only when the answers above make it relevant
- Client or main contractor nameShort answer
- Client or main contractor signatureSignature
- Completed by*Short answer
- SignatureSignature
See it filled in
A completed floor moisture test report, made by SiteSurvey from a fictional site visit: every answer, the photos, the guidance that applied and the sign-off, ready to send as a PDF.
Floor moisture test FAQs
Which test methods does it record?
Each reading records its method: relative humidity under a hygrometer hood, with the hours the hood was in place; a comparative moisture meter reading and its scale; or a carbide or oven moisture content. Only the relative humidity readings are compared with the limit.
What if the floor is too wet?
The form warns not to lay the covering yet. Record the preparation needed, such as more drying time and a retest, or a surface damp-proof membrane approved by the adhesive manufacturer.
Does it work out readings over the limit?
Yes. Enter the manufacturer's limit and each relative humidity reading, and the form shows how far each is from the limit and counts the readings over it.
Does it record flatness?
Yes. Record the worst gap under a 2 m straightedge. BS 8204-1 gives methods for assessing the levels and surface regularity of bases and screeds.
Who signs it?
The surveyor and the client or main contractor, so the readiness of the floor is agreed before work starts.
Who uses this?
Flooring contractors, fit-out contractors, main contractors and site managers.
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