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SPECIFICATION CHOICE MATRIX ECO-HOUSE: COST KING ELEMENT: SUSPENDED FLOORS & LOFTS PRODUCT: ISOVER (MINERAL GLASS WOOL INSULATION) SCORING PERFORMANCE COST BUILDABILITY SCORE LIFECYCLE/ MAINTENANCE COSTS EMBODIED ENERGY ENVIRONMENTAL IMPACT PRACTICAL USAGE BY OCCUPANT SCORE SCORE (OUT OF 10) 6/10 9/10 9/10 82.5% 4/10 6/10 6/10 5/10 52.5% TOTAL PERCENTAGE SCORE 68% WEIGHTING 25% 50% 25% 0% 0% 0% 0% ANALYSIS: Isover glass wool is manufactured from a combination of silica sand and up to 80% recycled post-consumer glass from building regeneration projects or flat glass manufacture that would otherwise go to landfill. It is therefore claimed that Isover is one of the most environmentally sustainable insulation products on the market. Under the BRE Green Guide, Glass mineral wool achieves an A+ rating. It can be cut with a knife or saw and comes in a roll format for suspended floors and lofts. However, precautions need to be taken when handling mineral fibre as it can be absorbed into the body by inhalation and prolonged exposure is considered a possible carcinogen similar to asbestos. It is said that mineral wool has a far higher embodied energy than natural and renewable materials and it cannot presently be recycled. The product costs £2.00 per m² for a thickness of 100mm. A thickness of 270mm is required to achieve a U-value of 0.16W/m²K.