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Environmental Preference Schedule Of Construction Elements Contd.
Environmental Preference Schedule Summary Adopted at The Fold – Shaded Grade Solutions were adopted at The Fold.
| Grade | ||||
|---|---|---|---|---|
| Item | Ultimate Aim | Good Practice | Acceptable Solution | To Be Avoided |
| Builders Waste | no export at all from site | sorted into recyclable rubble /timber/metals etc | burn waste | indiscriminate use of skips |
| Foundations | Local stone foundations with land drains around perimeter. Reduce thermal bridging to a minimum | Reused brick or block with recycled aggregate on minimal strip footing | new conc. block or new bricks on strip footing | Trench fill or reinforced slab/raft foundation with new aggregate. |
| Drainage | earthenware | spun concrete | – | UPVC |
| Roof Insulation | cellulose, sheep's wool or hemp/cotton with thermal broken timber I beams | reused insulation boards | mineral wool and expanded polystyrene | PUR, foam insulation, extruded polystyrene |
| Floor Insulation | Mineral wool,(glass wool & rockwool) Expanded polystyrene | Foamed glass | Perlite | Extruded polystyrene PUR |
| Wall Insulation | cellulose, cork, wood fibre boards or hemp/recycled cotton | Mineral wool or EPS, | Foamed glass | PUR, extruded polystyrene |
| Walls (new) External | Cob or earth, durable wood | reused brick or stone | new brick or concrete blocks made with recycled aggregate | concrete blocks, aerated autoclaved concrete blocks, strong cement mortars, tropical wood, preserved wood |
| Walls (new) Internal | Timber frame, clay block, cob or earth | Sand lime blocks, flue-gas gypsum blocks | Cellular Concrete blocks, natural gypsum blocks | Concrete, strong cement mortars |
| Timber Frame External Wall Finishes | Rain screen of durable timber from sustainable source | Lime sand render on lightweight lath | Fibre /cement sheet rain screen | hard cement render/new brickwork screen |
| Internal Wall Finishes | Local timber finish or lime-washed earth walls | Lime or clay plaster on masonry, timber lath or wood wool slab | Gypsum (natural or flue gas derived) plasterboard and plaster skim | MDF, plastic boards |
| External Window Frames and Doors | Sustainable European durable wood (oak) - Preferably English | European sustainable softwood (certified), Boron treated & finished with environmentally friendly microporous finish ie Osmo or Auro | Sustainable plywood & preserved wood | UPVC & tropical wood |
| Internal Windows and Doors | Durable home grown timber | European sustainable softwood | Sustainable plywood & preserved wood | UPVC & tropical wood |
| Ground Floors | Utilise existing concrete floor/suspended well insulated home grown wooden floor | Where thermal mass required, solid concrete with recycled aggregate and stabilised earth screed | Pre-cast concrete joists with concrete infill, reinforced in situ concrete slab | floating chipboard floor above concrete slab |
| Upper Floors | home grown timber joists with T & G timber floor boards on fibre board & plasterboard for sound deadening | as above with plywood floor | as above with strand board decking | as above with chipboard floor or concrete |
| Roof Structure | Cut roof | trussed rafters | flat roof | concrete roof |
| Roof Finishes | reused tile or shingles | timber battens/shingles (larch or oak) | new clay or concrete tiles | fibre cement tiles, Canadian cedar shingles, copper sheet |
| Rainwater Goods | bitumen lined timber guttering with recycled aluminium/cast iron down pipes | new aluminium, zinc, galvanised steel or cast iron | copper | PVC |
| Plumbing | Polybutylene pipes (Hep2O) above ground and polyethylene below ground. Internal wastes in polypropylene or polyethylene | Stainless steel | copper | PVC internal wastes and lead |
| Timber | Reused where possible | home-grown FSC certified | imported certified | pre-treated unsourced |
| Hard Landscaping | woodchip/bark or reused stone/brick/ concrete flags – no pointing | concrete paviours made from recycled aggregate set in sand with no pointing, gravel | new concrete or brick paviours with cement pointing, clay tiles | tarmac |
| Fencing | nativel broad leafed sp. or willow hedging | timber fence/drystone wall or reused brick walls with lime mortar | new brick/block wall | concrete or treated timber |
| Preservative Treatments | Avoid if unnecessary | Local treatment with Borates where required | Overall treatment | Pre - Treated timber |
| Paint Finishes/Decorations | untreated surface | lime wash or water based mineral paints for walls and ceilings and wax and oil finishes | Water based acrylic paints | Paints with organic solvents and lead based etc |
| Sealants | Coconut fibre, felt, sisal, lime. | Mineral wool, PE tape, EPDM seals | Elastomeric sealant with base filler | PUR foam, sealant or tape |
| Lighting | Design for natural light with reflective surfaces | Low energy and LED | Low voltage halogen | Tungsten |
| Heating | Super insulated and designed such that no heating system required | Carbon neutral heating system | Condenser boiler | Electrical heating |
