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Costs: Insulation

Get your estimating wrapped up. Here, Neil Barnett, resource cost services manager of BCIS, the Building Cost Information Service of the RICS, provides the latest sample cost breakdowns for various types of heat and sound insulation products

These guides reflect the prices a developer might expect to pay on a medium-sized residential project for products in the low to upper-middle specification range. Prices do not include for contractor preliminaries, overhead or profit margin. The base date is December 2010 at UK mean location and prices are based on the BCIS Online Rates Database.

Thermal insulation to basement

80mm thick extruded polystyrene and geotextile grooved boarding for external use on basement walls as insulation and protection to DPM 17.73-20.39
100mm thick ditto 23.75-27.31
120mm thick ditto 27.71-31.86

Thermal insulation to floors

50mm-thick extruded polystyrene insulating board under floor bearing concrete beds or screeds standard duty 9.93-11.42
75mm thick ditto 14.18-16.31
50mm thick medium duty ditto 10.41-11.97
75mm thick ditto 14.92-17.16
50mm-thick heavy duty ditto 17.82-20.49
75mm thick ditto 26.41-30.37

Thermal insulation to walls

50mm extruded polystyrene cavity-wall batts, built in as work proceeds ancillary items 10.24-11.78
75mm ditto 14.34-16.5
50mm fibre glass cavity wall batts, built in as work proceeds 7.21-8.29
75mm ditto 10.09-11.61
50mm expanded polystyrene bead injected into cavity wall 5.55-6.39
75mm ditto 6.84-7.86
27mm insulated plasterboard with tapered edges, fixed to softwood with galvanised nails, joints filled taped and flush jointed, nail or screw heads filled with joint filler, slurry coat to surface 58.35-67.11
30mm ditto 58.35-67.11
40mm ditto 60.63-69.73
50mm ditto 63.57-73.11
50mm woollen insulation batts fixed between the members of timber studwork 6.55-7.53
75mm ditto 9.27-10.66
100mm recycled paper insulation 5.15-5.92
150mm recycled paper insulation 7.11-8.17
50mm wood fibre insulation batts fixed between the members of timber studwork 7.75-8.92
75 mm ditto 10.62-12.22
25mm expanded polystyrene boards bonded to walls 7.14-8.21
50mm ditto 9.41-10.81
25mm fire resisting expanded polystyrene boards bonded to walls 8.92-10.26
50mm ditto 10.81-12.43
600mm-wide straw bale infill, fixed with wooden stakes, rendered both sides with cement lime render on expanded metal mesh, painted with four coats lime wash both sides 7.14-8.21
75mm-thick overall insulation system to external face of solid masonry wall, 50mm-thick extruded polystyrene insulation board mechanically fixed to wall, alkaline resistant reinforcing mesh, 20mm-thick 3-coat render, microporous external emulsion paint 9.41-10.81
100mm-thick overall insulation system to external face of solid masonry wall, 75mm thick extruded polystyrene insulation board ditto 8.92-10.26

Sound insulation to floors

Impact absorbing rubber sheet, 5mm thick, placed on floated concrete surface as base for cementious screed, turned up at edges, lapped and taped joints 19.33-22.23
18mm-thick on and including Gypframe 70 SB 65 steel battens at 400mm centres with 25mm acoustic insulation between 30.66-35.26
18mm thick on and including 12.5mm Soundbloc boarding and Gypframe 50 SB 65 steel battens at 400mm centres 32.62-37.52
28mm thick acoustic chipboard decking (Robust Detail FFT-5) resilient overlay platform floor system laid on concrete floor 34.35-39.5
32mm thick ditto 37.09-42.65

Insulation to ceilings and roofs

200mm glass fibre insulation quilt laid between roof joists 10.32-11.87
100mm glass fibre insulation quilt laid over joists or above suspended ceiling grid 6.48-7.45
Multi-layer foil quilt insulation fixed to sloping soffit of rafter 11.21-12.89
60mm thick CFC/HCFC-free rigid thermoset board, polyisocyanurate insulation core with autohesively bonded low emissivity composite foil facings on both sides, laid loose 11.72-13.48
80mm thick ditto 14.32-16.46
100mm thick ditto 17.59-20.23
96mm foil faced extruded polystyrene insulation board, bonded to a facing of 5.5mm WBP exterior grade plywood 20.83-23.96
116mm ditto 23.01-26.45
Warm roof insulation to pitch roof, comprising 100mm rigid urethane insulation fixed between rafters and 25mm to underside of sloping rafters 23.55-27.08
Warm roof insulation to pitch roof, comprising 120mm rigid urethane insulation fixed between rafters and 20mm to underside of sloping rafters 25.01-28.76

Sound insulation to ceilings and roofs

100mm acoustic pads, mineral fibre enclosed in 250gsm black polythene with heat sealed edges, laid in suspended ceiling grid 8.15-9.37
100mm acoustic pads, mineral fibre faced one side and all edges with reinforced Class ‘O’ foil and 65gsm black of white glass tissue on reverse, ditto 9.78-11.25
Fire and acoustic downlighter protection, for 75mm light, cutting hole and clipping into ceiling board 14.89-17.12

all prices in £/m2

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