Floors & Screeds
212 sources in the library on floors & screeds, 40 on this page cited in a published note. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 1 of 6.
- very strong RN-C8OYVJ cited
Department for Business, Energy and Industrial Strategy
The government's 2020 best-practice guide to insulating suspended timber floors; it lists draughts through gaps between floorboards as a main heat-loss route.
Cited in Suspended Timber Floors: Joists, Boards & Ventilation.
- very strong RN-5F0WOD cited
Department for Energy Security and Net Zero (GOV.UK)
The government guidance page on SAP. It settles that SAP is the energy rating methodology for dwellings, used to show new homes comply with Part L and to produce EPCs.
Cited in Floor Insulation Materials & Build-ups.
- very strong RN-2IWEP7 cited
Health and Safety Executive
HSE's guidance note behind every slip-resistance figure a flooring or paving note quotes, and the source that separates the two tests people conflate. Table 1 classifies slip potential from pendulum test values (PTV): 0 to 24 high, 25 to 35 moderate, 36 and above low. Table 2 gives the parallel Rz microroughness classification. It describes the HSL/UKSRG ramp CoF test, then deals with the German ramp tests separately: DIN 51097 uses barefoot operators with a soap solution and DIN 51130 uses heavily cleated EN ISO 20345 safety boots with motor oil, and HSE states it has reservations about both because neither uses contaminants representative of real workplaces and the way results are reported is a cause for concern. Table 3 sets the DIN 51130 R scale by slip angle: R9 6 to 10 degrees, R10 10 to 19, R11 19 to 27, R12 27 to 35, R13 above 35. It warns that R9 and sometimes R10 surfaces will be slippery when wet and that a single class covers a wide CoF range, R10 alone spanning 0.18 to 0.34, so an R number is not a substitute for a PTV. Note that BS 7976-2, the pendulum method, was withdrawn in February 2022, which makes this HSE page the right citation for the thresholds.
Cited in Bathroom Tiles: Types, Cost & Layout, Best Flooring for Kitchens, Bathrooms & Living Rooms, Floor Tiles: Porcelain vs Ceramic vs Stone, How to Tile a Floor and 4 more.
- very strong RN-NPO8FJ cited
Ministry of Housing, Communities and Local Government
The statutory figures behind a damp diagnosis, and the numbers to quote when a note explains why ground levels or a bridged damp proof course cause rising damp. Paragraph 5.2 requires that in an external wall the damp-proof course should be at least 150mm above the level of the adjoining ground (Diagram 8) unless part of the building protects the wall, and that in an external cavity wall the cavity should be taken down at least 225mm below the level of the lowest damp-proof course, or a damp-proof tray provided (Diagram 9a). For suspended timber ground floors it requires a ventilated air space of at least 75mm from the ground covering to the underside of any wall-plates and at least 150mm to the underside of the suspended timber floor or insulation, with ventilation openings on two opposing external walls of not less than 1,500mm2 per metre run of external wall or 500mm2 per square metre of floor area, whichever is greater; for suspended concrete floors the clear ventilated space is at least 150mm with the same opening sizes. Section 2.39 onwards covers radon, referring to BRE Report BR 211 for protective measures. The 2013 edition was published on 3 September 2013 with changes in effect from 1 October 2013.
Cited in Barge Boards, Fascias & Soffits: Cost & Replacement, Breathable Membranes for Roofs & Walls, Brick Slips & Brick Cladding Systems, Build Basement Cost: 2026 UK Price Guide and 46 more.
- very strong RN-YZL3J2 cited
Ministry of Housing, Communities and Local Government
The Approved Document for Part C. It sets out how a suspended timber ground floor must be built and ventilated, including the size of the ventilation openings, the requirement for a free air path between opposing walls, and the clearances beneath the floor.
Cited in Beam & Block vs Concrete Slab Ground Floors, Cavity Wall Insulation Materials Compared, Damp Proof Membranes (DPM) & DPC: Types & Installation, Hardcore, MOT Type 1 & Sub-base Materials Explained and 4 more.
- very strong RN-35VE7W cited
Ministry of Housing, Communities and Local Government
Table 0.1a sets separating element performance for dwellings: purpose built walls a minimum 45 dB DnT,w + Ctr, floors and stairs 45 dB airborne and a maximum 62 dB L'nT,w impact; where a dwelling is formed by material change of use the figures relax to 43 dB airborne and 64 dB impact. Table 0.2 sets the laboratory value for new internal walls and floors within a dwelling at a minimum 40 dB Rw. Requirement E2 covers internal walls between a bedroom or a room containing a WC and other rooms, and internal floors, but expressly does not apply to an internal wall containing a door, a wall separating an en suite toilet from its own bedroom, or existing walls and floors in a material change of use. Section 5 gives internal wall types A to D and internal floor types A to C, including timber or metal stud with plasterboard and mineral wool; paragraph 5.14 requires all gaps around internal walls to be filled.
Cited in Acoustic Insulation for Floors & Walls, Acoustic Underlay & Soundproof Flooring, Ceiling Lights: Downlights vs Pendants vs Spots, Concrete Blocks: Aircrete vs Dense vs Hollow and 12 more.
- very strong RN-D51A0B cited
UK Health Security Agency (UKradon)
UKradon explains that the Building Regulations may require no, basic or full radon protective measures, and that the requirement for a building site comes from the BGS GeoReports service.
- strong RN-IESP2J cited
BRE
BRE's BR 211, the guide Approved Document C points to, describes basic radon protection as a gas-tight radon membrane across the ground floor, with full protection adding a sump or ventilated void.
- strong RN-9M7SBG cited
BSI
BS 8203:2017, published 31 March 2017 and current. It gives recommendations for the installation of resilient floor coverings, specifically cork, linoleum, plastic (vinyl) and rubber, on both new and existing structures in conventional flooring applications. It includes design-stage considerations that support proper maintenance and long-term performance but excludes cleaning and maintenance guidance itself, and does not cover access flooring or specialised applications such as static-control flooring. This is the reference standard a note should cite for subfloor condition, acclimatisation and adhesive practice for vinyl and LVT.
Cited in Floor Levelling & Subfloor Prep, Floor Screed Types: Sand-Cement vs Liquid Anhydrite, Floor Tiles: Porcelain vs Ceramic vs Stone.
- strong RN-ZPFZGO cited
BSI
BS 8204-1:2003+A1:2009, published 22 December 2003 with Amendment 1 in 2009, committee CB/300, current. Clause 1 gives recommendations for constituent materials, design, work on site, inspection and testing of concrete bases and cementitious levelling screeds that are to receive in situ wearing screeds. It is Part 1 of a series: Part 2 concrete wearing surfaces, Part 3 polymer modified cement, Part 4 terrazzo, Part 5 mastic asphalt, Part 6 synthetic resin, Part 7 pumpable self-smoothing screeds. This is the standard behind screed thickness, mix, curing and soundness-test claims for a sand and cement screed, including its recommendations on inspection and testing.
Cited in Floor Screed Types: Sand-Cement vs Liquid Anhydrite.
- strong RN-ETP4JO cited
BSI
BS 8204-7:2003, published 12 March 2003, committee CB/300, current. Clause 1 gives recommendations for materials, design, work on site, inspection and testing of pumpable self-smoothing screeds, commonly called self-levelling screeds. It notes there are two principal types, one predominantly based on cementitious binders and the other predominantly on calcium sulfate (anhydrite) binders, and it covers both pumpable levelling screeds and pumpable wearing screeds in buildings. As a levelling screed it is intended to receive floor coverings such as textiles, linoleum, PVC, rubber and cork, or rigid floorings. This is the correct citation for a liquid or anhydrite screed note, including the distinction between cementitious and calcium sulfate binders that governs which adhesives and coverings can be used.
Cited in Structural Materials: The Complete Guide.
- strong RN-LLZVVY cited
BSI
BS EN 13813:2002, published 11 November 2002, committee CB/300, under review, identical to EN 13813:2002. It is the product standard for screed material used in floor construction, giving the properties and requirements a screed material must declare, and it is the standard a screed specification designates a product against. BSI publishes no scope preview for this page, so the designation letters and strength classes themselves must be read from the standard or from BS 8204-1 and BS 8204-7, which are the companion codes of practice for laying cementitious and pumpable self-smoothing screeds. Cite this one for the point that screed is a specified product with declared properties rather than a generic site mix.
Cited in Floor Screed Types: Sand-Cement vs Liquid Anhydrite.
- strong RN-3LY0EO cited
BSI
The standard that supplies the imposed floor loading a home gym, a loft store or a mezzanine has to be checked against, and the material densities used to work out the dead load of a new floor build-up. Published 29 July 2002, current and under review, BS EN 1991-1-1 classifies actions, distinguishing self-weight from imposed loads, defines design situations, then gives densities of construction and stored materials, self-weight of construction works and imposed loads for buildings by category of use. A note that says a floor may not take a rack of weights or a large aquarium should point here, together with the UK National Annex, rather than to a rule of thumb.
Cited in Building a Home Gym: Cost & Setup (Garage or Spare Room), Skylights vs Roof Lanterns vs Roof Windows.
- strong RN-G4ZRB1 cited
BSI
BS EN 300:2006, published 31 August 2006, committee B/541, current; it supersedes BS EN 300:1997. Clause 1 states it applies to oriented strand boards, defines the terms, establishes a classification and specifies the requirements, with clause 4 being the classification of boards and clause 5 the general requirements for all OSB types. It states plainly that the values it lists relate to product properties and are not characteristic values to be used in design calculations: test methods for mechanical properties for structural purposes are in EN 789, determination of characteristic values and density for structural purposes in EN 1058, and design characteristic values for OSB in EN 12369-1, with supplementary properties in Annex C. This is the standard that a board marked OSB3 is classified against, so cite it whenever a note specifies OSB for a floor deck.
- strong RN-DNW09X cited
BSI
BS EN 312:2010, published 30 November 2010, committee B/541, under review; it supersedes BS EN 312:2003 and the earlier seven-part series BS EN 312-1 to -7, whose part titles are still visible in the BSI catalogue and name the board categories directly: general purpose boards for use in dry conditions, boards for interior fitments including furniture for use in dry conditions, load-bearing boards for use in dry conditions, load-bearing boards for use in humid conditions, and heavy-duty load-bearing boards for dry and for humid conditions. Clause 1 of the 2010 edition specifies the requirements for flat-pressed or calendar-pressed unfaced particleboards as defined in EN 309, and it is called up in EN 13986 for construction applications where these are referred to as resin-bonded particleboards. It warns the values it lists are product properties and are not characteristic values for design calculations, which come from EN 12369-1 or from testing to EN 789, EN 1058 and ENV 1156. This is the standard behind a chipboard flooring panel grade.
Cited in Chipboard, OSB & Plywood Flooring Compared, Timber Merchants: What They Stock & How to Buy.
- strong RN-TBEMIM cited
BSI
BS EN 338:2016, published 30 June 2016, committee B/518, ISBN 978 0 580 83526 1, current; it supersedes BS EN 338:2009. Clause 1 establishes the system of strength classes for general use in design codes, giving characteristic strength and stiffness properties and density values for each class, to which EN 14081-1 refers. It applies to all softwood and hardwood timber for structural use within the scope of EN 14081-1. This is the standard that defines C16 and C24, the two softwood classes a merchant sells joists in, along with the C and D class series generally. Clause 5 is the classification of structural timber and clause 6 covers allocation of a population to a strength class by visual grading or machine grading. Cite it whenever a note says a joist is C16 or C24, since the letter and number are a graded characteristic strength, not a species or a quality label.
Cited in Structural Materials: The Complete Guide, Timber Merchants: What They Stock & How to Buy.
- strong RN-QWYQ8T cited
BSI (British Standards Institution)
STATUS: CURRENT. BS 4978:2007+A2:2017 was published 30 November 2017 and is the live edition, superseding BS 4978:2007+A1:2011, BS 4978:2007 and the older BS 4978:1988 Specification for softwood grades for structural use. It specifies the methodology for visual strength grading of softwood for structural use and sets the permissible limits of characteristics (knots, slope of grain, fissures, wane, distortion, rate of growth) for two visual grades: GS (General Structural) and SS (Special Structural). These are grades, not strength classes: the strength class a graded piece maps to (C16, C24 and so on) depends on species and is assigned via BS EN 1912 and BS EN 338, so a note saying a timber is graded C24 to BS 4978 is conflating the two. The catalogue page confirms number, title, date, status and grades; the limit tables are paywalled.
Cited in Reclamation Yards & Salvage: Buying Reclaimed Materials, Roof Battens & Counter-Battens: Sizes & Grading, Structural Materials: The Complete Guide, Timber Merchants: What They Stock & How to Buy.
- strong RN-6UNXU6 cited
BSI (British Standards Institution)
STATUS: WITHDRAWN on 24 November 2009. BS 5268-2:2002 was published 14 March 2002 and amended in December 2007 to align with CEN material standards, then withdrawn. It was the permissible stress code of practice for structural timber, glued laminated timber, plywood and other panel products in load bearing members, covering quality, grade stresses, modification factors, nailed, screwed, bolted and glued joints, testing of structural assemblies, and workmanship, treatment, inspection and maintenance. It was superseded by Eurocode 5, BS EN 1995-1-1, which uses limit state design and characteristic values rather than permissible stresses, so any note quoting BS 5268 joist spans or grade stresses is quoting a dead standard and should be corrected to BS EN 1995-1-1 (with the current edition BS EN 1995-1-1:2025 superseding BS EN 1995-1-1:2004+A2:2014). The catalogue page confirms number, title, publication date and the withdrawal date but does not name the superseding standard.
- strong RN-2F1BXP cited
BSI (British Standards Institution)
The current British code of practice for laying a tiled floor, published 31 May 2024. It is the third of what is now a four-part BS 5385 series: Parts 1 and 2 cover internal and external wall tiling, Part 4 covers tiling in special conditions such as wet areas and swimming pools, and Part 3 now covers all rigid flooring. The 2024 revision consolidates and replaces both BS 5385-3:2014 on ceramic and mosaic floor tiling and BS 5385-5:2009 on terrazzo, natural stone and agglomerated stone flooring, so a specification that still cites BS 5385-5 is out of date. Its scope is recommendations for the design, installation and maintenance of floor tiling using ceramic tiles, mosaics, terrazzo tile and slab, natural stone internal and external floorings, and engineered stone for internal flooring. BSI states the revision was driven by ceramic floor tiles becoming thicker and larger, which has made the installation methods for ceramic and stone converge. Covers bedding onto concrete, cement and sand and calcium sulfate screeds, heated screeds, timber and existing hard finishes, plus movement joints and tolerances.
Cited in Floor Levelling & Subfloor Prep, How to Tile a Floor.
- strong RN-YM2ENG cited
BSI (British Standards Institution)
STATUS: CURRENT. BS 5756:2007+A2:2017 was published 30 November 2017, the same date as the matching amendment to BS 4978 for softwood, and supersedes BS 5756:2007+A1:2011 and BS 5756:2007. It specifies a method of grading temperate hardwood visually for structural use in the United Kingdom and names four grades in two categories: for large size timber, Heavy Structural Temperate Hardwood THA and THB, and for smaller sections, General Structural Temperate Hardwood TH1 and TH2. This is the standard to cite for a structural oak beam or an oak frame, the hardwood counterpart to BS 4978 for softwood, with the grade to strength class mapping again made through BS EN 1912 and BS EN 338 (green oak commonly reaching D24 or D30). Catalogue page confirms number, title, date, status, scope and the four grade names; the limit tables are paywalled.
- strong RN-BBWVOC cited
BSI (British Standards Institution)
STATUS: CURRENT, and it is the standard that replaced most of the old BS 7533 parts. BS 7533-102:2025 was published 31 March 2025 and gives the code of practice for installing modular paving units of clay, concrete and natural stone, covering bound and unbound surface constructions for paved areas under pedestrian and vehicular loading, all layers from formation upwards (sub base, base, bedding and surface), and recommendations for maintenance and reinstatement. It excludes aircraft pavements, port areas and heavy industrial settings. Its companion BS 7533-101:2021 covers structural design. Because the series was restructured into the 101/102 numbering in 2021 and 2025, a note citing BS 7533-3, -4, -7 or -9 for laying block paving or flags is almost certainly citing a withdrawn part. Catalogue page confirms number, title, date, status and scope.
Cited in How to Lay a Patio.
- strong RN-DP7TIT cited
BSI (British Standards Institution)
STATUS: CURRENT (marked Under Review). BS EN 13242:2002+A1:2007 was published 12 December 2002 and was amended in May 2008 to incorporate CEN amendment A1:2007. It specifies the properties required of aggregates obtained from natural, manufactured or recycled materials for use in unbound and hydraulically bound materials in civil engineering work and road construction, covering grading, particle shape, resistance to fragmentation, resistance to wear, and chemical and durability requirements. This is the standard behind MOT Type 1 and Type 3 sub base and the recycled equivalents used under a driveway or patio: a note specifying a compacted granular sub base should cite BS EN 13242 for the aggregate and the Specification for Highway Works Series 800 for the Type 1 grading itself. Catalogue page confirms number, title, date, amendment, status and scope; the property tables are paywalled.
Cited in Hardcore, MOT Type 1 & Sub-base Materials Explained.
- strong RN-02VRB9 cited
BSI (British Standards Institution)
STATUS: CURRENT (marked Under Review). BS EN 13670:2009 was published 28 February 2010, is identical to EN 13670:2009 and sits under ICS 91.080.40. It specifies the execution (workmanship) requirements for concrete structures in buildings and other engineering works, covering falsework and formwork, reinforcement and prestressing, concreting, curing, inspection and permitted geometric tolerances, for reinforced, prestressed and precast concrete. It is the site counterpart to design under BS EN 1992-1-1 and to the concrete specification standards BS EN 206 and BS 8500, so a note describing how a slab or foundation should actually be placed and cured should cite BS EN 13670 rather than the design code. It replaced the execution content previously carried in the withdrawn BS 8110. Catalogue page confirms number, title, date, status and scope; the tolerance tables are paywalled.
Cited in Rebar & Steel Mesh: Sizes, Grades & When You Need Them.
- strong RN-TXD8LA cited
BSI (British Standards Institution)
STATUS: CURRENT, and it is the replacement for the withdrawn BS EN 519. BS EN 14081-1:2016+A1:2019 was published 31 August 2019, ISBN 978 0 539 06 228 1, and supersedes BS EN 14081-1:2016. It sets the requirements for strength graded structural timber of rectangular cross section produced by sawing, planing or similar, covering BOTH visually and machine graded timber, and it gives the test methods, the Assessment and Verification of Constancy of Performance and the marking rules, which is what makes a C16 or C24 stamp on a joist meaningful. It excludes fire retardant treated timber, thermally or chemically modified timber and structural finger jointed timber. Parts 2 and 3 add machine grading type testing and factory production control. Cite this with BS 4978 (visual grading rules), BS EN 338 (strength classes) and BS EN 1912 (assignment of grade and species to class). Catalogue page confirms number, title, date, status, supersession and scope.
Cited in Builders' Merchant vs DIY Store: Which Is Cheaper?, Reclamation Yards & Salvage: Buying Reclaimed Materials, Structural Materials: The Complete Guide, Suspended Timber Floors: Joists, Boards & Ventilation and 1 more.
- strong RN-B6U1Z6 cited
BSI (British Standards Institution)
STATUS: CURRENT but time limited. BS EN 1992-1-1:2004+A1:2014 (originally published 23 December 2004) is Eurocode 2, the limit state design code for plain, reinforced and prestressed concrete structures in normal and lightweight aggregate concrete, with specific rules for buildings; it works alongside BS EN 1990 for the basis of design and must be read with the UK National Annex, NA+A2:2014. It superseded ENV 1992-1-1, 1992-1-3, 1992-1-4, 1992-1-5, 1992-1-6 and 1992-3. It does NOT cover plain reinforcement, structural fire design (that is BS EN 1992-1-2), bridges, dams or offshore structures. Important for dating a note: the second generation Eurocode BS EN 1992-1-1:2023 has been published, and BSI will withdraw the UK adoptions of the first generation Eurocodes on 30 March 2028, so any note relying on the 2004+A1:2014 edition has a known expiry date. Catalogue page confirms number, title, date, status, supersessions and scope; the design rules are paywalled.
Cited in Rebar & Steel Mesh: Sizes, Grades & When You Need Them.
- strong RN-OOWRV7 cited
NHBC
NHBC course page stating that NHBC Standards Chapters 4 and 5 cover foundation types and ground-bearing and suspended floor construction for warranted new homes.
- good RN-44JL5F cited
Modern Masonry Alliance, Mineral Products Association
The Modern Masonry Alliance's guide to beam and block ground floors: beam spacing (440 mm, or 215 mm with blocks sideways), infill blocks, bearings, grouting and levelling screed, insulation to reach Part L U-values, vapour control and ventilation of the void.
- fair RN-9FOXX3 cited
Energy Saving Trust
Floor insulation performance targets, savings and cost. Target U-values: 0.25 W/m2K or lower in England, Wales and Northern Ireland, and 0.18 W/m2K or lower in Scotland, achieved with at least 70mm of high performance rigid foam or around 150mm of mineral wool depending on floor type and construction. Replacing 50% or more of a floor triggers the duty to insulate to those standards even if insulation was not in the original plan. Insulating under the ground floor boards saves about £55 a year in Great Britain and £70 in Northern Ireland, rising to up to £85 in GB and £120 in NI for a detached house, and cuts about 180kg of carbon in GB and 260kg in NI. A typical suspended timber floor installation costs £1,400 to £2,500 by house type, and solid floor insulation costs considerably more. Suspended timber floors are typical of homes built between the 1850s and the 1950s, identified by airbricks below floor level; solid concrete ground floors are common from the 1950s onwards, and floors built since the early 2000s are usually already insulated.
Cited in Home Energy Audit: DIY Steps, Insulation: The Complete Guide, Underfloor Insulation: Suspended & Solid.
- fair RN-HA43OU cited
Wood Panel Industries Federation
The wood panel trade federation's PanelGuide flooring section: decking panels are laid across the joists with short edges supported.
- supplier figure RN-KNHDYU cited
ARDEX UK
Manufacturer data for ARDITEX NA latex based levelling and smoothing compound. Coverage is approximately 5 m2 at 3mm thick per unit, so a 20 m2 room at 3mm needs about four units. Application thickness is 3mm to 6mm generally, extending to 3mm to 30mm over pitch adhesive residues provided the residue is hard, sound, not water softenable and cohesive. Over steel the surface must first be abraded or shot blasted to bright metal before applying at 3-6mm. Above 8mm ARDEX Coarse Aggregate improves coverage. Embodied carbon is quoted at 0.49 kg CO2 eq per kg. The manufacturer notes that properties built before the 1970s commonly lack a structural damp proof membrane and can read up to 98 per cent relative humidity, in which case a pre-smoothing layer is followed by a surface damp proof membrane. ARDEX also notes 1 N/mm2 equals about 100 tonnes/m2, and that some products in the range walk on in as little as 1 hour and deep fill to 50mm.
Cited in Floor Levelling & Subfloor Prep.
- supplier figure RN-MKY4UZ cited
ARDEX UK
A screed manufacturer's floating-floor system datasheet. It gives the minimum sand-cement floating screed as 65 mm for lightly loaded or domestic floors and 75 mm for other buildings.
Cited in Floor Screed Types: Sand-Cement vs Liquid Anhydrite.
- supplier figure RN-WZVSRN cited
BEWI
The maker's datasheet for the Jabfloor EPS floor insulation range. It shows the grade number is the compressive strength at 10% strain, from EPS 70 up to EPS 250.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-PFL83F cited
British Board of Agrément (published by Kingspan Insulation)
The BBA certificate for a 0.022 W/mK PIR floor board tabulates the thickness needed on a ground-bearing slab for each U-value and perimeter/area ratio. At P/A 0.4 to 1.0 it gives 75/90/100/100 mm for 0.18 against 50/60/60/70 mm for 0.25, i.e. about 1.4 to 1.7 times as much, which settles 'roughly half as much again'.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-ATUGH7 cited
Builder Depot
A builders' merchant's product page for a 100 mm glass mineral wool roll sold for lofts and suspended timber ground floors, priced at £2.88 per square metre including VAT in September 2026.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-ULHD8T cited
Builder Depot
A builders' merchant's product page for a 100 mm Jabfloor 70 EPS floor insulation board, priced at £12.83 per square metre including VAT in September 2026.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-UUPT6U cited
Builder Depot
A builders' merchant's product page for a 50 mm general-purpose PIR board suitable for floors, priced at £10.46 per square metre including VAT in September 2026.
Cited in Floor Insulation Materials & Build-ups, PIR vs Mineral Wool Insulation Compared.
- supplier figure RN-IW553C cited
Builder Depot
A builders' merchant's product page for a 50 mm phenolic floor insulation board, priced at £26.29 per square metre including VAT in September 2026.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-8BCE8L cited
Builder Depot
A builders' merchant's product page for a 75 mm general-purpose PIR board suitable for floors, priced at £14.77 per square metre including VAT in September 2026.
Cited in Floor Insulation Materials & Build-ups.
- supplier figure RN-OV63YJ cited
BuyMaterials
Product listing for the common Hepworth 215 x 65 mm clay airbrick, giving its free air space as 1,300 mm²; used for a product dimension only.
Cited in Suspended Timber Floors: Joists, Boards & Ventilation.
- supplier figure RN-HVB1D6 cited
Dunlop (ARDEX)
Manufacturer technical data for a standard water resistant floor and wall tile adhesive, useful as the baseline against a flexible adhesive. At 3mm thickness a 20 kg bag covers approximately 2 kg/m2 on dry wall areas and 3.5 kg/m2 on floors, exterior and wet areas. Open time is 15 to 20 minutes, noticeably shorter than the 30 to 45 minutes of the S1 grade. Bed thickness is 3 to 6mm. Mix ratio is about 2.5 parts powder to 1 part water by volume, roughly 5.6 litres of cold water per 20 kg bag. Application is at about 20C and never below 5C. It exceeds BS EN 12004 for a C1T adhesive, and the manufacturer states it is not suitable for porcelain tiles or exterior areas unless a flexible additive is used. Maximum weight of tiling including adhesive is 20 kg/m2 onto plaster and 32 kg/m2 onto plasterboard, with plasterboard requiring fixing at 300mm centres or as the board manufacturer directs.
Cited in Tile Adhesive & Grout Explained, Tile Shops & Tile Merchants: Buying Tiles for Less.