Each entry is quoted from its source and linked to it. The full set is in the standards reference.
BS 8201 — installing timber and wood-based flooring
BS 8201:2011 is the UK code of practice for installing flooring of wood and wood-based panels; it gives recommendations on the material, environmental and installation factors that determine how the finished wood floor performs.
“BS 8201 gives recommendations and guidance on the material, environment and installation variables that combined have a fundamental effect on the performance and serviceability of finished wood flooring.”
Source: BS 8201:2011 - Code of practice for installation of flooring of wood and wood-based panelsDamp-proof membrane — Approved Document C
Approved Document C, paragraph 4.2, states that floors next to the ground should resist the passage of ground moisture to the upper surface, not be damaged by moisture from the ground or by groundwater, and resist the passage of ground gases.
| paragraph in Approved Document C | 4.2 |
|---|
| requirement covered | C2 Resistance to moisture |
|---|
“Floors next to the ground should: a. resist the passage of ground moisture to the upper surface of the floor; b. not be damaged by moisture from the ground; c. not be damaged by groundwater; d. resist the passage of ground gases.”
Source: Approved Document C - Site preparation and resistance to contaminants and moisture, 2013 edition (HM Government)The hygrometer method for subfloor moisture
In UK practice a hygrometer is sealed to the subfloor inside an insulated box with butyl tape and left until the air under the box reaches equilibrium; at least 4 hours before the first reading on a 50 mm screed with the DPM under the screed, and 72 hours where the DPM lies below the base slab.
| minimum time before first reading, 50 mm screed with DPM between base and screed | 4 hours |
|---|
| minimum time before first reading, DPM below the base slab | 72 hours |
|---|
“For 50mm thick screeds, where the damp proof membrane is placed between the base and the screed, a period of at least 4 hours should be allowed before the first reading is taken. For thicker constructions i.e. where the damp proof membrane is placed below the base slab, a period of 72 hours should be allowed to elapse before the first reading.”
Source: Digital Hygrometer - Technical Data Sheet, F. Ball and Co. LtdBS 8203 — relative humidity limit for a subfloor
UK practice following BS 8203 treats a subfloor as dry enough for resilient floor coverings when hygrometer readings do not exceed 75% relative humidity (65% RH for solid timber coverings), measured with a hygrometer sealed to the surface so that it reaches equilibrium with the base.
| RH limit, resilient floor coverings | 75 % RH |
|---|
| RH limit, solid timber floor coverings | 65 % RH |
|---|
“The base can be considered dry enough to install most floorcoverings if a series of tests produce readings not exceeding 75% R.H. (65% R.H. for solid timber floorcoverings).”
Source: F. Ball and Co. Ltd - Digital Hygrometer, Technical Data SheetBS EN 13226 — solid parquet elements
BS EN 13226 specifies the characteristics of solid parquet elements with grooves and/or tongues intended for internal use as flooring, covering elements with or without surface treatment.
“This European Standard specifies the characteristics of solid parquet elements with grooves and/or tongues for internal use as flooring. This standard is not applicable to panels made from elements for which a separate standard is in course of preparation.”
Source: BS EN 13226:2009 - Wood flooring. Solid parquet elements with grooves and/or tonguesHerringbone and chevron — what the two patterns are
Herringbone is laid from rectangular blocks whose ends are cut square: set at right angles to each other and staggered, so that the end of one block meets the side of the next and the pattern reads as a broken zigzag. Chevron blocks have their ends cut at an angle - typically 45 or 60 degrees, depending on the manufacturer - so the ends meet on a continuous line and form a V. No published standard we could read defines the two patterns; the definitions here come from manufacturers and agree with each other.
| Herringbone: angle between adjacent blocks | 90 degrees |
|---|
| Chevron: typical end-cut angle (manufacturer-dependent) | 45 or 60 degrees |
|---|
“Herringbone flooring features rectangular wood planks arranged in a staggered zigzag pattern. Each plank meets the next at a 90-degree angle. In chevron patterns, the wood planks are cut at an angle, typically 45 or 60 degrees, so they meet in a continuous V-shape.”
Source: Havwoods - Herringbone vs. Chevron: Which Parquet Style Suits Your Space Best? · second sourceWood over underfloor heating
UK trade-association guidance sets no blanket ban on wood over underfloor heating but ties it to a temperature limit, noting that some hardwood floor finishes are installed with a maximum floor surface temperature of 27 °C.
| maximum floor surface temperature for some hardwood finishes | 27 °C |
|---|
“For example, some hardwood floor finishes are installed with a maximum floor surface temperature of 27°C.”
Source: CFA Guidance Document — Beyond Installation: Guidance on Underfloor Heating (Contract Flooring Association)Moisture content at delivery — what EN 13489 requires
EN 13489, the product standard for multi-layer parquet, requires the moisture content of the elements to be between 5 % and 9 % at the time of first delivery, measured by the oven-dry method of EN 13183-1. The corresponding figure for solid parquet under EN 13226 was not available from a source we could read, so it is not stated here.
| Moisture content at first delivery, multi-layer parquet (EN 13489:2023, clause 4.1.2) | 5-9 % |
|---|
“The moisture content shall be between 5 % and 9 % at the time of the first delivery of the product.”
Source: EN 13489:2023 - Wood-flooring and parquet - Multi-layer parquet elements (SIST preview of the standard, clause 4.1.2 Moisture content)Acclimatisation before fitting
The Contract Flooring Association's guide states that the room should be at its in-service temperature 48 hours before installation so that the flooring can be kept in the room and reach room temperature before it is laid.
| conditioning before installation | 48 h |
|---|
“They also advise that this temperature should be attained 48 hours prior to the installation, so that floorings can be kept in the room and brought to room temperature (acclimatised) before installation.”
Source: CFA Guide to Contract Flooring - Contract Flooring AssociationHow often a wood floor can be sanded
No trade-association or standards source found puts a number on how often an engineered wood floor can be sanded; the only sourced figure comes from a manufacturer, Kährs, which says engineered floors can be sanded up to four times depending on wear-layer thickness.
| sanding cycles, engineered wood floor (manufacturer statement) | up to 4 times |
|---|
“Depending on the thickness of the wear layer, they can be sanded up to four times, extending their lifespan significantly.”
Source: FAQ about flooring - Kährs
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