Steel & Structural Timber
152 sources in the library on steel & structural timber. 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 4 of 4.
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Knauf Insulation
Glass mineral wool roll for timber frame between studwork, ECOSE Technology binder. Declared thermal conductivity 0.032 W/(mK), the best in the FrameTherm range. Reaction to fire A1 to EN 13501-1. Supplied 90 mm x 1140 mm x 4500 mm giving R 2.80 (m2K)/W and 5.13 m2 per roll, and 140 mm x 1140 mm x 2800 mm giving R 4.35 (m2K)/W and 3.19 m2 per roll. Rolls are ready-cut into 2 x 570 mm or 3 x 380 mm widths to friction fit between studs.
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Lignacite
Product data updated 8 January 2026. Expanded clay aggregate block. Face size 440 x 215 mm, thickness 100 mm and 140 mm, mean unit strength 3.6 N/mm2, Group 1 solid, tolerance Category D1. Net dry density 850 kg/m3. Thermal conductivity 0.27 W/mK at 3% moisture, internal use. Reaction to fire Class A1, moisture movement 0.6 mm/m, frost resistance to PD 6697 Table 15. BS EN 771-3, BSI Kitemarked, Category 1. Lignacite direct that a 7.3 N/mm2 block such as Lignacrete Standard is used below ground rather than Fibo 850, and note the low self weight suits partitions built off a floor slab.
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Lignacite
Product data updated 5 June 2026. Fine textured block available paint grade or fair face. Face size 440 x 215 mm, thickness 100 mm and 140 mm, mean unit strength 3.6, 7.3 and 10.4 N/mm2, Group 1 solid, tolerance Category D1. Net dry density 1570 kg/m3 for 100 mm blocks. Thermal conductivity 0.90 W/mK at 3% moisture, internal use, for 100 mm blocks. Air permeability unfinished: 3.0 m3/hr/m2 for 100 mm solid blocks and 2.8 for 140 mm SP solid blocks. The 140 mm Lignacite SP uses a modified mix to optimise density as a solid block. Lignacite recommend 210-215 mm walls be built as two leaves of 100 mm blocks laid back to back and tied.
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Lignacite
Product data updated 22 December 2025. Face size 440 x 215 mm, thickness 100 mm and 140 mm. Mean unit strength 3.6, 7.3 and 10.4 N/mm2. Group 1 solid blocks, dimensional tolerance Category D1, net dry density 1450 kg/m3. Thermal conductivity 0.47 W/mK at 3% moisture (internal use) and 0.51 W/mK at 5% moisture (external use). Reaction to fire Class A1, moisture movement less than 0.5 mm/m, frost resistance to PD 6697 Table 15. BSI Kitemarked and certified to BS EN 771-3, Category 1 masonry units. Lignacite recommend 215 mm walls be built from 100 mm blocks laid flat, and that 7.3 N/mm2 blocks be used below ground where exposed to external soil. 3.6 or 7.3 N/mm2 blocks are used as beam and block infill, with the 3.6 N transverse tested.
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Lignacite
Product data updated 8 January 2026. Dense concrete block, generally 440 x 215 mm face size, with the 140 mm Midi at 290 x 215 mm. Mean unit strengths 7.3, 10.4, 17.5, 22.5 and 30 N/mm2, the widest strength range of the Lignacite ranges. Group 1 solid, tolerance Category D1. Net dry density 2000 kg/m3 for the 7.3 and 10.4 N blocks and 2100 kg/m3 for the 22.5 N and above. Thermal conductivity 1.33 W/mK at 3% moisture and 1.43 W/mK at 5%. Reaction to fire Class A1, moisture movement less than 0.6 mm/m. BS EN 771-3, BSI Kitemarked, Category 1. Used for internal and fire break walls and as beam and block floor infill.
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Lignacite
Product data updated 12 May 2026. Face size 440 x 215 mm, single thickness 190 mm, mean unit strength 7.3 N/mm2, Group 1 solid, tolerance Category D1. Net dry density 1030 kg/m3, thermal conductivity 0.37 W/mK at 3% moisture, internal use. Air permeability of a 190 mm block: 9.1 m3/hr/m2 painted on one face and 4.0 m3/hr/m2 painted on two faces. Reaction to fire Class A1 to BS EN 13501-1, moisture movement less than 0.9 mm/m, frost resistance to PD 6697 Table 15. The 190 mm thickness is offered to span further between vertical or horizontal supports than a slimmer wall.
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Marley Ltd
Marley Type A brown batten: preservative brown treated to Use Class 2. Marley states explicitly that it is NOT suitable for BS 5534 applications and that JB Red is the graded batten to use for roofing. This is the distinction that decides whether a batten is legal to tile onto, and it is not visible on site once fitted.
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Metsa Wood (Metsa Group)
Declared characteristic values for Kerto LVL Q-panel, cross-veneered LVL-C, in strength classes LVL 32 C and LVL 36 C respectively. Bending edgewise at 300 mm depth fm,0,edge,k 28.0 and 32.0 N/mm2; flatwise parallel 32.0 and 36.0; flatwise perpendicular 7.0 and 8.0. Compression parallel fc,0,k 19.0 and 26.0; perpendicular edgewise 9.0 for both; perpendicular flatwise 2.2 for both. Tension parallel ft,0,k 19.0 and 26.0 at 3,000 mm length; perpendicular edgewise 6.0 for both, which is far above the 0.8 of the all-parallel S-beam and is the point of the cross veneers. Shear edgewise fv,0,edge,k 4.5 for both, flatwise parallel 1.3, flatwise perpendicular 0.6. Modulus of elasticity parallel E0,mean 10,000 and 10,500 N/mm2, E0,k 8,300 and 8,800. Shear modulus edgewise G0,edge,mean 600 and G0,edge,k 400; flatwise parallel 80 and 120 mean. Mean density 510 kg/m3.
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Metsa Wood (Metsa Group)
Kerto LVL Q-panel has roughly 20% of its veneers oriented crosswise. Thicknesses 27-75 mm meet strength class LVL 36 C; thicknesses 21-24 mm meet LVL 32 C. Common sizes: thicknesses 27, 39, 45, 51, 57, 63 and 69 mm in panel widths 900, 1200/1250, 1800/1820 and 2400/2500 mm. Panels up to 2,500 mm wide and 20 m long. Used for roof, floor and wall panels, high slender beams and prefabricated elements.
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Metsa Wood (Metsa Group)
Declared characteristic values for Kerto LVL S-beam, strength class LVL 48 P, thickness 21-90 mm, harmonised standard EN 14374:2004, AVCP System 1, notified body Eurofins Expert Services Oy 0809. Bending strength edgewise at 300 mm depth fm,0,edge,k 44.0 N/mm2 with size effect parameter s = 0.12; flatwise parallel fm,0,flat,k 50.0. Compression parallel fc,0,k 35.0 N/mm2 (divide by 1.2 in service class 2), perpendicular edgewise 6.0, perpendicular flatwise 2.2. Tension parallel ft,0,k 35.0 N/mm2 at 3,000 mm length, perpendicular edgewise 0.8. Shear edgewise fv,0,edge,k 4.2 N/mm2, flatwise parallel 2.3. Modulus of elasticity parallel E0,mean 13,800 N/mm2 and E0,k 11,600. Shear modulus edgewise G0,edge,mean 600 and G0,edge,k 400. Density mean 510 kg/m3, characteristic 480 kg/m3. Reaction to fire D-s2,d0 at a minimum 21 mm thickness.
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Metsa Wood (Metsa Group)
Made of 3 mm strength graded softwood veneers all with the same grain direction, bonded with weather and boil resistant phenol formaldehyde adhesive. Overall dimensions: thickness minimum 27 mm to maximum 75 mm, width or height 40 mm to 2,500 mm, length 2,000 mm to 25,000 mm (20,000 mm above 1,830 mm wide). Thickness tolerance plus or minus 1.0 mm at 27 mm or less, 2.0 mm from 27 to 57 mm, 3.0 mm above 57 mm, at 10 plus or minus 2% moisture content. Optical sanding removes about 2 mm of nominal thickness and calibrated sanding about 3 mm, and design must use the sanded thickness. CE and UKCA marked, design properties to EN 14374, structural design to EN 1995 Eurocode 5. Formaldehyde emission below 0.062 mg/m3, well under the Class E1 limit of 0.100 ppm. Heavy duty multiple-glued beams from 78 mm to 144 mm are available but not CE marked. 1 m3 stores on average carbon equivalent to 783 kg CO2.
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Metsa Wood (Metsa Group)
Kerto LVL S-beam is all-parallel-veneer LVL. Thicknesses 27-75 mm meet strength class LVL 48 P. Standard common sizes: thicknesses 45, 51, 57 and 63 mm in heights 200, 220, 240, 260, 300, 360, 400, 450 and 600 mm. Uses given are beams and headers, studs and columns, and components for roof, floor and wall elements. Downloads on the page include the product datasheet, the Declaration of Performance, the UK Declaration of Conformity and EPD-IES-0026805.
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Michelmersh Brick Holdings
Clamp-fired handmade sand faced stock brick from Freshfield Lane, red multi. Standard size 215 x 102.5 x 65 mm with 215 x 102.5 x 50 mm also available, which is the size used to match imperial-coursed period brickwork. Compressive strength greater than or equal to 27 N/mm2. Dimensional tolerance T2, dimensional range R1, freeze/thaw durability F2, active soluble salts S2. DoP common root reference --FL65FAB--. Quantity per pack 400.
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Michelmersh Brick Holdings
Clamp-fired stock facing brick from Freshfield Lane, dark red multi, stock sand faced. Dimensions 215 x 102.5 x 65 mm. Compressive strength greater than or equal to 27 N/mm2. Dimensional tolerance T2, dimensional range R1, freeze/thaw durability category F2, active soluble salts category S2. DoP common root reference --FL65FAB--. Quantity per pack 400, product weight 2.225 kg, 60 bricks per square metre. Michelmersh state that bricks around DPC level, roughly two courses above and below ground, must be F2 and S2 to EN 771-1 for severe exposure, and that all their facing bricks meet F2/S2. They advise against sealing brickwork because trapped moisture appears as white staining, and advise laying frogged bricks frog upwards so the frog fills with mortar.
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MiTek Industries
Posi-Joist metal web joists. Web types and their clearance between flanges and standard overall depth: PS8 108 mm clearance and 202 mm depth; PS9 131 mm and 225 mm; PS10 159 mm and 253 mm; PS12 210 mm and 304 mm; PS14 279 mm and 373 mm; PS16 327 mm and 421 mm. The open web is sized so MVHR ducting and services pass through the floor zone without notching. Acoustic floor build-ups in the handbook include 202 mm Posi-Joist with 22 mm chipboard and 253 mm Posi-Joist with 18 mm plywood or 22 mm chipboard; ceiling details call for a minimum 35 x 97 C16 noggin nailed to the underside and drywall screws at 230 mm centres for joists 253 mm and deeper. Spans are confirmed through MiTek's interactive span tables rather than a printed table.
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Naylor Concrete Products
Hi-Spec prestressed concrete lintels with a 30 minute fire rating as standard. Fourteen section sizes in widths of 100 mm, 140 mm, 190 mm and 215 mm, with lengths from 450 mm to 4800 mm depending on section. Additives and the concrete strength make them suitable for use below ground. Supplied with a textured finish for plastered or rendered work. They can be cut to length without adversely affecting performance, and each lintel is marked at the top to ensure correct orientation during installation. Fixings may be made on site provided the prestressing tendons remain undamaged. Certified to BS EN 1992-1-2:2004, BS EN 845-2:2013+A1:2016, BS EN 206:2013+A2:2021 and BS 8500-1:2015, with prestressing wire to BS 5896:2012.
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Naylor Concrete Products
Naylor prestressed concrete lintels are designed to Eurocode 2 Part 1-1 and conform to BS EN 845-2:2013+A1:2016. Concrete strength 50 N/mm2 throughout the range. Standard lengths 600 mm to 3600 mm, with bespoke lengths up to 4800 mm. End bearing allowances supplied as standard: 100 mm each end for openings up to and including 1000 mm, 150 mm for openings up to and including 3000 mm, and 200 mm for openings over 3000 mm, with the designer responsible for checking these do not over-stress the masonry. Low water absorption from the dense mix means they can be used underground provided the ends are encased in a minimum 45 mm of mortar over the ends of the reinforcing strands. Camber is inherent in a prestressed element and is limited to L/250. Fixings can be made into the lintel provided the tendons are undamaged. Materials comply with BS EN 206:2013+A2:2021 and BS 8500-1:2015, prestressing wire with BS 5896:2012.
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Plasmor
Aglite Ultima, low density loadbearing block from Plasmor's own expanded clay plus lightweight aggregates. Strengths and densities: 4.2 N/mm2 at 1050 kg/m3, 7.3 N/mm2 at 1050 kg/m3, 10.4 N/mm2 at 1150 kg/m3. Thermal conductivity K 0.31 W/mK at 4.2 N and 7.3 N, 0.36 W/mK at 10.4 N. Available 100 mm at 4.2, 7.3 and 10.4 N/mm2 and 140 mm at 7.3 and 10.4 N/mm2. Work size 440 x width x 215 mm, coordinating size 450 x width x 225 mm. Pack coverage 9.6 m2 at 100 mm, 6.4 m2 at 140 mm. The 100 mm block is an 11.5 kg one hand lift. Below DPC use is limited to the 7.3 N grade. Complies with Part L, Part E and Robust Details E-WM-12, E-WM-17, E-WM-34 and E-FC-4.
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Plasmor
Fibolite, ultra lightweight loadbearing block made from Plasmor expanded clay nodules produced in a rotary kiln, with a vitrified outer shell and honeycombed core. Strengths and densities: 3.6 N/mm2 at 850 kg/m3 and 7.3 N/mm2 at 950 kg/m3. Thermal conductivity K 0.24 W/mK at 3.6 N and 0.28 W/mK at 7.3 N, the lowest lambda of the Plasmor aggregate block ranges. Sizes: 100 mm and 140 mm in both 3.6 and 7.3 N, 190 mm in 3.6 N, 215 mm in 7.3 N. Work size 440 x width x 215 mm, coordinating 450 x width x 225 mm, solid. Most of the range meets the 20 kg single lift limit under CDM. Suitable for walls below DPC.
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Plasmor
Plascon dense aggregate block. Strengths 7.3 N/mm2 and 10.4 N/mm2, both at a dry density of 1900 kg/m3. Thermal conductivity K 1.13 W/mK at both strengths, which is roughly ten times the lambda of an aircrete block and the reason dense blocks are kept out of the insulated leaf. Sizes 100 mm and 140 mm in both strengths, solid. Work size 440 x width x 215 mm, coordinating 450 x width x 225 mm. Pack coverage 7.2 m2 at 100 mm and 4.8 m2 at 140 mm.
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Plasmor
Stranlite general purpose lightweight aggregate block. Strengths and densities: 4.2 N/mm2 at 1350 kg/m3, 7.3 N/mm2 at 1400, 10.4 N/mm2 at 1450, 17.5 N/mm2 at 1600, 22.5 N/mm2 at 1600. Thermal conductivity K 0.41 W/mK at 4.2 N and 7.3 N, 0.43 W/mK at 10.4 N. Sizes: 75 mm in 7.3 N; 100 mm in 4.2, 7.3, 10.4, 17.5 and 22.5 N; 140 mm in 7.3, 10.4, 17.5 and 22.5 N; 190 mm in 7.3 N; plus a 100 mm flooring block at 3.5 N/mm2. Work size 440 x width x 215 mm. Pack coverage 12.0 m2 at 75 mm, 9.6 m2 at 100 mm, 6.4 m2 at 140 mm, 4.8 m2 at 190 mm.
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Plasmor
Stranlite Synerg.Eco low carbon block. Mean compressive strength 7.3 N/mm2, dry density 1400 kg/m3, thermal conductivity k 0.41 W/mK. Shear bond strength 0.15 N/mm2. Moisture movement not greater than 0.6 mm/m. Fire classification A1 non-combustible to BS EN 13501-1. Accepts direct nailing. Work size 440 x width x 215 mm, coordinating size 450 x width x 225 mm. Complies with Part E and Robust Details for floors and walls.
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Rawlplug
Pure epoxy bonded anchor, approvals ETA-21/0244 and UKTA-22/6132, working life up to 100 years, for cracked and non-cracked concrete C20/25 to C50/60, dry and wet substrates including flooded holes (use categories I1 and I2), diamond and hammer drilling, seismic categories C1 and C2. Installation data by rebar size: 8 mm bar needs a 12 mm hole, minimum embedment 60 mm, maximum 160 mm; 10 mm bar 14 mm hole, 70 to 200 mm; 12 mm bar 18 mm hole, 80 to 240 mm; 14 mm bar 18 mm hole, 80 to 280 mm; 16 mm bar 22 mm hole, 100 to 320 mm; 20 mm bar 26 mm hole, 120 to 400 mm. Minimum spacing and edge distance 40 mm up to 14 mm bar, 50 mm at 16 mm, 60 mm at 20 mm. Minimum substrate thickness hnom+30 and at least 100 mm. Curing and working times: at 5 C, 2880 minutes cure and 150 minutes working time; at 10 C, 1080 and 120; at 20 C, 480 and 35; at 25 C resin in 30 C concrete, 300 and 12. Curing time must be doubled in wet concrete. Mean ultimate tension loads range from 24.7 kN for the smallest bar at minimum embedment to 92.9 kN at maximum embedment for larger bars. Holes must be brushed and blown at least four times each and resin injected from the base of the hole filling to 70% of depth.
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ROCKWOOL UK
Stone wool frame slab made with NyRock patented fibre technology, described by ROCKWOOL as the lowest lambda stone wool insulation currently available in the UK and Ireland. Declared thermal conductivity 0.032 W/mK, product standard EN 13162:2012+A1:2015. Reaction to fire Euroclass A1 in accordance with BS EN 13501-1: 2018. Long term water absorption WL(P), short term WS.
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Simpson Strong-Tie
Heavy (H) and light (L) restraint straps in pre-galvanised mild steel, stainless to order. Heavy straps are 4 mm thick and 28 mm wide for lateral restraint of trusses, rafters and joists tied into masonry; light straps are 2 mm thick for vertical loads such as wall plates. Stock lengths 500 to 2000 mm in 50 mm increments, with bend (B) dimensions of 100 mm or 150 mm and twist (T) versions. Characteristic capacity: H series 8 kN using 8 no. N3.75x30 square twist nails into the wall plate; L series 4 kN using 5 no. 5.5 x 50 mm masonry fixings and 3 no. N3.75x30 nails into the joist or rafter. Installation rules given: horizontal lateral restraint straps at not more than 2 m centres, attached to at least three timber members through noggings and packing; the bend must be a minimum 100 mm and positioned at the centre of an uncut block or brick; vertical restraint straps at least 1 m long; masonry fixings are hardened 4 mm x 75 mm nails or 5.5 x 50 mm screws into plugs, with the lowest fixing within 150 mm of the bottom of a vertical strap. Straps fixed to noggings or trusses take eight 3.75 x 30 mm square twist nails evenly distributed.
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Simpson Strong-Tie
Heavy duty face fix hangers in 2 mm pre-galvanised mild steel, nailed with square twist nails and with bolt holes for 12 mm fasteners into the face. Key installation rule stated on the sheet: the hanger depth must be at least 60% of the carried member depth to prevent rotation unless extra lateral restraint is added at the top of the carried member. Characteristic capacities for C24 timber, R1,k downward with N3.75x30 nails: SAE200 series 7.6 kN into a C16 header and 8.1 kN into a C24 header, using 8 header and 5 joist fasteners, R2,k 4.2 kN; SAE250 12.7 and 13.5 kN with 12 and 7 fasteners, R2,k 5.9 kN; SAE380 18.2 and 19.4 kN with 20 and 10 fasteners, R2,k 8.5 kN; SAE500 33.3 and 35.6 kN with 32 and 16 fasteners, R2,k 12.2 kN; SAE600 42.2 and 45.1 kN with 36 and 20 fasteners, R2,k 15.9 kN. Product dimensions given by joist width from 36-38 mm up to SAEL at 140 and 150 mm, with hanger weights from 0.26 kg to 0.786 kg. Minimum supporting timber thickness with SSH10x40 screws is 47 mm.
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STEICO
STEICOjoist is an I-joist to European Technical Approval ETA-20/0995 for floor joists, rafters or wall studs, with a natural wood fibreboard web 39 mm thick and laminated veneer lumber STEICO LVL R flanges. Three flange widths: SJ 45 in heights 160, 200, 220, 240, 300, 360 and 400 mm at 43 pieces per package; SJ 60 in heights 160 to 500 mm at 33 per package; SJ 90 in heights 220 to 500 mm at 23 per package. Heights range 160 mm to 500 mm overall. Every I-joist is also available with a factory pre-insulated web, which gives a uniform rectangular cross section so STEICOflex batts fit without cutting. STEICO LVL is built from 3 mm graded veneers, CE certified and manufactured to EN 14374: LVL R has all veneers longitudinal, LVL X has about one fifth crosswise. The system is certified by the Passive House Institute.
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STEICO
Characteristic strength and stiffness in N/mm2. STEICO LVL R: bending edgewise parallel fm,0,edge,k 44 at 300 mm depth with size effect s = 0.15, flatwise parallel 50, tension parallel ft,0,k 36, tension perpendicular edgewise 0.9, compression parallel fc,0,k 40, compression perpendicular edgewise 7.5. STEICO LVL X at 24 mm or less: bending edgewise 30, perpendicular edgewise 10, flatwise 32; at 27 mm and above 32, 8 and 36. Span tables to BS EN 1995-1-1 for maximum single clear span in metres at final deflection L/250 and fundamental frequency above 8 Hz, live load 1.5 kN/m2: SJL 45 at 240 mm deep spans 4.785 m at 300 mm centres and 4.240 m at 600 mm centres with a 0.75 kN/m2 dead load; SJL 60 at 400 mm deep spans 6.850 m at 300 centres and 6.120 m at 600; SJL 90 at 400 mm deep spans 7.495 m at 300 centres and 6.685 m at 600. Floor tables are service class 1, roof tables service class 2, and double-span tables follow.
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STEICO
Flexible wood fibre batt to EN 13171, board designation WF - EN 13171 - T3 - TR1 - AFr5 - MU 2. Declared thermal conductivity 0.036 W/(mK). Density 50 kg/m3. Water vapour diffusion resistance factor mu 2. Specific heat capacity 2100 J/(kgK). Declared airflow resistance greater than or equal to 5 (kPa s)/m2. Declared thermal resistance (m2K/W) by thickness in mm: 0.80 (30), 1.10 (40), 1.35 (50), 1.65 (60), 2.20 (80), 2.75 (100), 3.30 (120), 3.85 (140), 4.40 (160), 5.00 (180), 5.55 (200), 6.10 (220), 6.65 (240). sd values 0.06 m at 30 mm rising to 0.48 m at 240 mm. Ingredients wood fibres, polyolefin fibres, ammonium sulfate; biogenic carbon approximately 82 kg CO2eq/m3. Fire class (RTF) according to EN 13501-1: E.
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Thor Helical
AISI 304 austenitic stainless steel crack stitching bars, 316 on special request. Lengths 1.0 m, 1.5 m and 2.0 m; diameters 5, 6, 7, 8 and 9 mm. Bars extend 500 mm either side of the crack. Typical performance loads in a 35-40 mm slot at 400 mm embedment, tested to EN 846-4: single 6 mm bar 8.39 kN, single 7 mm 9.75 kN, single 8 mm 11.06 kN, single 9 mm 11.50 kN; double 6 mm bars 16.00 kN, double 7 mm 17.65 kN, double 8 mm 17.65 kN. BS EN 845-1:2013 requires equivalence to the prescriptive 30 x 5 mm lateral restraint strap with a declared tensile load capacity of at least 8 kN, which every listed configuration exceeds. Bonded with WHO60 polymer-modified structural repair grout. Supplied in lots of 500, packed in resale bundles of 10 and 25. UKCA and CE marked.
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Thor Helical
AISI 304 stainless helical bars (316 on request) for retrofit bed joint reinforcement, lengths 7.0, 8.0 and 10.0 m up to a stated maximum of 10 m, diameters 5, 6, 7, 8 and 9 mm. Cold rolled from stainless wire and twisted through a die, giving a tensile strength of 1050-1200 N/mm2, which Thor state is twice that of rebar, four times that of epoxy glass fibre rods and seven times that of wound helix plate, citing BRE GBG62. Retrofit brick beam capacities from BRE testing with conservative safety factors, quoted at 300, 450 and 600 mm beam depths: 1.2 m span 21.8 kN, 1.6 m 16.4 kN, 2.0 m 13.1 kN, 2.4 m 10.9 kN, 2.8 m 9.4 kN, and 3.2 m 8.2 kN at 450 and 600 mm depth (not available at 300 mm). Beams are formed by reinforcing two separate mortar beds, each with a pair of bars in WHO-60 grout, the two chords acting as flanges with the masonry between as the web. Supplied in lots of 100, coiled and tied in fives.
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Unilin Insulation (formerly Xtratherm)
PIR wall board for timber frame walls with composite foil facers both sides, 2400 x 1200 mm, thicknesses 25, 30, 40, 50, 60, 70, 75, 80, 100, 110, 125 and 150 mm. Thermal conductivity 0.022 W/mK. Compressive strength CS(10Y) 140 kPa. Reaction to fire: Euroclass F. Published R-values (m2K/W): 25 mm 1.10, 40 mm 1.80, 50 mm 2.25, 60 mm 2.70, 80 mm 3.60, 100 mm 4.50, 120 mm 5.65.