Materials – Interior
333 sources in the library on materials – interior, 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 2 of 9.
- strong RN-WOP4JZ cited
Robust Details Ltd
The scheme that lets a builder skip pre-completion sound testing by registering a certified separating wall or floor construction instead, and the practical answer for a note that says a converted flat must pass a sound test. The site publishes an introduction to the scheme, the Robust Details Handbook containing the full specification for each detail, and the registration process for new houses and flats, with separate routes signposted for Scotland and Northern Ireland because the underlying regulations differ there. A registered Robust Detail must be built exactly as specified, which is why floor build-up and underlay substitutions matter.
Cited in Acoustic Insulation for Floors & Walls.
- strong RN-C54UIB cited
The Institution of Engineering and Technology
The IET's electrical standards site, which publishes BS 7671 with BSI. It confirms the current Wiring Regulations are the 18th edition as amended by Amendment 4:2026.
- good RN-5MTP2P cited
British Woodworking Federation
BWF guidance on timber durability and specification. States that where national requirements and end use are not available, the moisture content of the timber shall not exceed 13% for heated buildings or 16% for use in unheated buildings. Useful as the ceiling figure against which the common trade rule of thumb of 8 to 12% kiln-dried moisture content for kitchen worktops and interior joinery can be sanity-checked.
Cited in Butcher Block Countertop Cost: 2026 UK Price Guide, Timber Cladding: Species, Treatment & Cost.
- good RN-H21TPJ cited
BWF Fire Door Alliance
Trade body guide to keeping Certifire fire door certification valid on site. It limits trimming to the stated allowance on the sides and bottom and lists alterations that take a door outside its certification.
- good RN-ENP5OQ cited
BWF Fire Door Alliance (British Woodworking Federation)
Gives the installation tolerances a homeowner can check on a newly fitted fire door: the gap between door and frame at head and sides should be 2 to 4 mm, and the threshold gap should follow the manufacturer's instructions, typically around 8 to 10 mm. Voids between the frame and the surrounding wall must be tightly packed with mineral wool. Essential ironmongery must be CE marked, firmly fixed with no missing screws and compatible with the leaf's certification, and the frame, lining or casing and the intumescent and smoke seals must match the door's fire rating. Cutting glazing apertures or air transfer grilles on site invalidates certification and may only be done by a certificated licensed processor.
- good RN-X5IZ09 cited
BWF Fire Door Alliance (British Woodworking Federation)
Gives the intumescent seal sizes for domestic fire doors: 15 mm x 4 mm for most modern 30 minute doors other than doorsets, and 20 mm x 4 mm, or two of 10 mm x 4 mm, for most modern 60 minute doors. Gaps around the leaf should not exceed 3 mm along the two long edges and across the top; the gap at the bottom is usually around 10 mm for non-smoke conditions but 3 mm where smoke seals are required. Seals expand under heat to fill the gap, with sodium silicate and graphite types expanding at different rates, so the same seal type should be used all round; combined intumescent and smoke seals resist cold smoke and are a Building Regulation requirement in some circumstances.
- good RN-HJAN6Z cited
Institute of Historic Building Conservation
The IHBC's own page for HESPR, its heritage business listing; it confirms what the scheme is and that listed firms work to IHBC conservation standards.
Cited in How to Repair Victorian Coving.
- good RN-T7OS59 cited
Wood Panel Industries Federation
The panel industry federation's technical guide to MDF; it gives the thickness range MDF is manufactured in (1.8 mm to 60 mm) and the common panel sizes.
- fair RN-OXKRIE cited
Timber Development UK
Timber Development UK's species page for European whitewood. It defines whitewood as Norway spruce and silver fir, as distinct from redwood, which is Scots pine.
Cited in Door Linings & Frames Explained.
- supplier figure RN-UZ4FVA cited
B&Q
B&Q product page for a full 2440 x 1220 x 25 mm MDF sheet at £59 including VAT; it backs the corrected 25 mm MDF line in the materials table.
Cited in How to Build Alcove Cupboard And Shelves.
- supplier figure RN-55ZBM7 cited
B&Q
A national DIY retailer's guide to skirting board profiles (bullnose, chamfered, lambs tongue, ogee, ovolo, torus). Used only for the profile definition, since no standards body defines these trade names; it confirms chamfered and pencil-round are different profiles.
Cited in Skirting Boards: Types, Sizes & Cost (MDF vs Timber).
- supplier figure RN-KPL6ZV cited
B&Q
B&Q product page for Thistle MultiFinish, reproducing the maker's application steps. It gives a two-coat skim of at least 2 mm total, the setting timeline and coverage of about 10 m² per 25 kg bag.
Cited in Plastering Your Home.
- supplier figure RN-6TTJ1B cited
B&Q (sold by Traditional Products Ltd)
A B&Q marketplace product page for a complete 90 mm square pine newel 1.5 m long with its cap, sold by its UK maker. It settles the price of £62.40, the top of the softwood newel row.
Cited in Newel Posts, Spindles & Balustrades.
- supplier figure RN-OMSV8U cited
BAL Adhesives
BAL's guide to movement joints: British Standards divide interior floor tiling into fields of at most 10 m each way and exterior at 3 m, with joints at perimeters, structural joints and changes of base material.
Cited in Tile Adhesive & Grout Explained.
- supplier figure RN-97W51D cited
BAL Adhesives
BAL's summary of BS 5385-1:2018: heavier tiles relative to the background's capacity must be solidly bedded regardless of size, and minimum grout joints are 2 mm for tiles under 0.1 m² and 3 mm for 0.1 to 1 m².
Cited in Tile Adhesive & Grout Explained.
- supplier figure RN-MWWTC3 cited
BAL Adhesives
BAL's guide to grout faults lists poor adhesive coverage, meaning tiles not solid-bed fixed, among the common causes of cracked grout, and warns against grouting before the adhesive has cured.
Cited in Tile Adhesive & Grout Explained.
- supplier figure RN-93XKIB cited
BAL Adhesives
BAL's explanation of the BS EN 12004 codes (C, D, 1, 2, T, E, F) and the S1 and S2 deformability classes: S1 is 2.5 to 5 mm transverse deformation, S2 above 5 mm.
Cited in Bathroom Tiles: Types, Cost & Layout, Tile Adhesive & Grout Explained, Tiling a Floor Over Underfloor Heating: What to Know.
- supplier figure RN-PXH7X2 cited
Builder Depot
A builders' merchant product page for a softwood fire-check door lining set machined with a 15 mm rebate, finished 33 x 133 mm, for 762 and 838 mm doors.
Cited in Door Linings & Frames Explained.
- supplier figure RN-DA635U cited
Builder Depot
Builders' merchant product page for a Richard Burbidge 41 mm white oak stop-chamfer spindle, 900 mm long, at £10.74 including VAT, inside the note's £8–£18 oak range.
Cited in New Banister Spindles.
- supplier figure RN-OO065H cited
Builder Depot
A builders' merchant's MDF category page listing 18 mm standard MDF sheets (2,440 × 1,220 mm) at £19.14 including VAT; sets the low end of the table's MDF sheet price.
- supplier figure RN-XGROA8 cited
Builder Depot
A builders' merchant's skirting listing pricing 18 × 119 mm primed MDF skirting at £13.98 per 4.4 m length including VAT, which sets the low end of the MDF skirting price.
- supplier figure RN-UMQQWP cited
Builder Depot
A builders' merchant's planed softwood listing giving 25 × 150 mm PAR at £4.79 per metre including VAT, supporting the table's softwood PAR price.
- supplier figure RN-VT8ENW cited
Buy Insulation Online
A merchant product page for Thistle MultiFinish finishing plaster, used because the maker's site is behind a bot challenge. It gives the 2 mm maximum coat thickness.
- supplier figure RN-WVN11H cited
Complete Stair Systems
A UK spiral stair maker explains the BS 5395-2 categories and says the smallest diameter for a primary (Category B) spiral is 1,800 to 1,900 mm, varying with the centre column.
- supplier figure RN-O402RB cited
Doordeals
Retailer product page for a made-to-order paint grade solid-core flush internal door in standard sizes, priced from £210.55 including VAT; it sets the top of the supply-only range.
- supplier figure RN-N0H1NK cited
Doordeals
Retailer product page for a white primed, solid-core flush internal door in standard 1981 mm imperial and 2040 mm metric sizes, priced from £104.95 including VAT; it sets the low end of the supply-only range.
- supplier figure RN-VJKBDP cited
Dulux Trade (AkzoNobel)
Manufacturer specifier guide with the numbers behind a how-much-paint calculation. Coverage is quoted at 18 m2 per litre for Diamond Matt, 17 m2 per litre for Vinyl Matt, and 16 m2 per litre for the other two grades in the comparison table, so a 5 litre tin covers roughly 85 m2 in one coat and a two coat job on a 40 m2 room needs about 5 litres. Scrub resistance is Scrub Class 5 on the top grade against Scrub Class 2 on Vinyl Matt, both Class 1 to ISO 11998 and Type C to BS 7719. Dulux Trade Vinyl Matt is stated to be 99.9 per cent VOC free based on in-can VOC content measured to ISO 11890-2:2013, and the guide shows measured VOC emissions in mg/m3 against the BREEAM TVOC threshold of less than or equal to 1.0 mg/m3. For airless spraying the guide specifies a 515 or 517 tip at 1300-1700 psi (89-117 bar). The manufacturer notes coverage is a guideline only and varies with equipment, substrate and application.
Cited in How Much Paint Do I Need?.
- 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.
- supplier figure RN-Q0X1Q7 cited
EcoTherm Insulation (Kingspan Insulation Ltd)
Thermal laminate: PIR core bonded to 12.5 mm Gyproc Type A plasterboard to EN 13950: 2014. Insulation core lambda 0.022 W/mK; plasterboard component lambda 0.19 W/mK. Product thicknesses 37.5 to 82.5 mm (25 to 70 mm of insulation plus 12.5 mm board). Published R-values and typical U-values on a 215 mm dense blockwork wall with 10 mm polymer render: 25 mm insulation R 1.10, U 0.57 battens / 0.56 dot and dab; 30 mm R 1.35, 0.51 / 0.50; 40 mm R 1.80, 0.42 / 0.40; 50 mm R 2.25, 0.36 / 0.34; 60 mm R 2.70, 0.32 / 0.30; 70 mm R 3.15, 0.28 / 0.26 W/m2K. Fire: Eco-Liner achieves European Classification (Euroclass) B-s1,d0 when classified to BS EN 13501-1: 2018, supported by test reports WF 546613 (EN 13823) and WF 516756 (EN ISO 11925-2).
- supplier figure RN-SBVL57 cited
Emerald Doors
A door supplier's size guide; it gives 1981 mm as the usual internal door height in England and Wales and 2040 mm as the metric height common in Scotland.
- supplier figure RN-CM4377 cited
Evo-Stik (Bostik)
The maker's page for the solvent-free version of Gripfill, which states that polystyrene and foamed and laminated PVCs are sensitive to solvent, the reason the solvent-based grab adhesive is not used on them.
Cited in Grab Adhesive & Construction Adhesives.
- supplier figure RN-V7M13B cited
Harlow Bros
Builders' merchant product page for a 41 x 41 x 900 mm solid pine stop-chamfer spindle, priced at £4.04 including VAT (£3.37 ex VAT) each, which sits inside the note's £2–£6 range.
Cited in New Banister Spindles.
- supplier figure RN-DRM4XG cited
Internal Doors
A door retailer's product page for a solid pine ledged and braced V-groove internal door. It lists the door from £164.95 including VAT, near the top of the note's pine range.
- supplier figure RN-56CN1X cited
JB Kind Doors
A UK internal door maker's size guide. It lists imperial doors at 1981 mm high and 35 mm thick and gives 1981 x 762 mm as the most common size in England and Wales.
- supplier figure RN-Q5S62R cited
JELD-WEN
A UK door maker's FAQ on standard sizes. It says its doors generally allow 4 mm of trimming from either side and 6 mm from the bottom.
- supplier figure RN-RVL4ZD cited
JELD-WEN UK
A UK door maker's buying guide listing its standard internal door sizes: 1981 mm high by 610, 686, 762 and 838 mm wide, with imperial equivalents.
Cited in Door Linings & Frames Explained.
- supplier figure RN-RWELDW cited
JELD-WEN UK
A door manufacturer's technical specification guide; it gives FD30 doors as 44 mm thick and FD60 as 54 mm.
- supplier figure RN-73C2A7 cited
JELD-WEN UK
A door manufacturer's sizing table; for a 1981 x 762 mm leaf it gives an overall doorset of 2025 x 818 mm, a structural opening of 2045 x 852 mm and a clear opening of 701 to 710 mm.
- supplier figure RN-CIPZ3U cited
Lawsons
Lawsons' product page for a single 120 mm x 3 m gypsum plaster cove, priced at £17.35 including VAT (£14.46 ex VAT), which is £5.78 per metre and the top of the note's range.
Cited in Coving & Cornice: Types, Cost & Fitting.
- supplier figure RN-CSKGXO cited
Lords Builders Merchants
A builders' merchant product page for a single softwood door lining set with stops, finished 27 x 133 mm, priced £36.83 including VAT and £30.69 excluding VAT.
Cited in Door Linings & Frames Explained.