self build specification

instaSPEC

a curation of product and material precedent images to visually describe our house type specification

methodology

The proprietary materials and products specified for our first house type auxano have been selected based on a combination of extensive research and previous experience. While the presence of relevant certifications such as BBA (British Board of Agrément) certificates and conformity to relevant British Standards are baseline criterion, other factors such as; aesthetics, value for money, company reputation and stability, availability, sustainability, buildability, liveability have also been taken into account. The below overview explains our specification methodology in more detail.

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BUILDABLITY
Amongst a number of modern methods of construction, we opted for a KINGSPAN TEK structural insulated panels (SIPs) superstructure. These SIPs panels, which make up the external walls and roof of the house type, are manufactured offsite and erected in “no time at all” to provide a well-insulated and airtight shell. Where possible, attempts have been made to minimise the number of suppliers and components in order to make material procurement more straightforward. For example, a LAZENBY polished concrete floor is both a floor finish and the ground floor structure, removing the need for both a floor screed and additional floor finishes.

MEDIUM-SPEC
This specification is neither basic or high-end, but rather something in the middle. While efforts have been made to source products and materials that represent value for money, rarely has the cheapest option been opted for. At the same time, excessively costly items have been avoided. For example, while a HI-MACS solid surface worktop with integrated sink has been specified rather than a basic laminate worktop, pure luxuries such as a spa facilities have not been included. While the QUOOKER FLEX boiling water tap could be viewed as a luxury, it was specified with the view that the removal of a kettle from the counter top would save space.

ECO HOME
The auxano specification is underpinned by a ‘fabric first’ approach to sustainable building design that focuses on the maximising the performance of the building envelope before considering the use of eco-technologies. The KINGSPAN TEK structural insulated panels (SIPs), which make up the external walls and roof, consist of a urethane insulation core and OSB/3 facings either side, and so insulation actually makes up most of the structure. The use of SIPs splines between walls panels, MARMOX THERMOBLOCK load bearing insulated blocks at the base of walls, and an additional layer of KINGSPAN THERMAWALL TW55 wall insulation on the inside of the structure minimise thermal bridging. VELFAC 200 ENERGY doors and windows with composite frames and low-emissivity triple glazed units with argon filled cavities ensures the interior benefits from natural daylighting and heating without compromising heat retention. The above is complemented by the specification of renewable and energy-efficient technologies. An NIBE F2040-8 air source heat pump (ASHP) is specified as the primary energy source which works by extracting solar energy from the air to heat both the domestic hot water (DHW) and warm-water for the NU-HEAT underfloor heating (UFH) system.

HEALTHY HOME
Careful attention has been taken to specify a safe and healthy home. Efforts have been made to avoid materials which emit harmful gases such as volatile organic compounds (VOCs), selecting materials such as AURO low-VOC paints and varnishes. The decision was also made to make auxano a gas-free home, with no gas connection and no gas appliances. As it happens, at time of writing, the Government are suggesting that there could be total ban on gas connections to new housing from 2025, primarily for ecological reasons. The ENVIROVENT ENERGI SAVA 300 PLUS mechanical ventilation heat recovery (MVHR) system extracts stale moist air from kitchens and bathrooms, captures heat as the outgoing waste air passes through a heat exchanger, and then warms incoming air from outside to deliver a constant supply of fresh, clean, tempered air to habitable rooms for a comfortable and healthy interior environment with stable humidity levels, free from condensation and mould.

SMART HOME
The specification of a fully integrated LOXONE smart home system fine tunes the functioning of the home with control and automation of; lighting, shading, heating, ventilation, security and access control, and with intelligent energy management. For example, the ability to control heating on a room-by-room basis or to “turn off” the whole house at night can result in significant energy savings and correspondingly low bills. Check out our blog post explaining why we specified specified a LOXONE smart home system.

LOW-MAINTENENCE HOME
Certain products or materials have been specified with a view to reducing future maintenance. LED light fixtures throughout the home are not only low-voltage and therefore more energy-efficient but also last longer than traditional light bulbs. FERMACELL gypsum fibreboard dry linings are specified because of their high load-bearing capacity and screw-holding ability removing the need for wall plugs. HI-MACS natural acrylic stone solid surface worktop, sink, and splashback can be joined together to create a visually seamless surface which is very hygienic and easy to clean. DOMUS CRETA SLIM large-format lightweight-porcelain tiles reduce grouting to a minimum and therefore reduce the need for future maintenance.

CONTEMPORARY HOME
Certain specifications are based on an aspiration for contemporary-detailing and practical finishes that facilitate modern life. This is approached by attempting to reduce complexity and minimise the number of components where possible. For example; COLOURCOAT URBAN standing seam system is used to clad both roof and external walls; the specification of ECLLISE SYNTHESIS flush doors and skirtings eliminate architraves and protruding skirtings from the interior meaning that furniture can be fitted tight to the walls; LUMI-PLUGIN’s modular LED downlights are designed to receive life-saving plugins such smoke alarms and heat alarms, reducing the number of ceiling-mounted fixtures for a streamlined interior.

FUTURE-PROOFED HOME
While the specification does not include various features such as whole home audio visual or solar panels, the design is future-proofed to facilitate future installation of such systems. For example, MI-TEK open-web floor joists have been specified to facilitate access to floor voids, and BUTTON-FIX TYPE 2 concealed panel fixings have been specified to secure plywood panelling and facilitate access to wall voids, all with future maintenance and/or installations in mind.

1 substructure

VISQUEEN ZEDEX CPT high-performance damp proof course (DPC)
MARMOX THERMOBLOCK load-bearing insulation blocks
FORTERRA THERMALITE AIRCRETE SHIELD aggregate blocks
LAZENBY polished concrete floor
VISQUEEN HIGH-PERFORMANCE damp-proof membrane (DPM)
KINGSPAN KOOLTHERM K103 rigid floor insulation

2 superstructure

DEWALT BLUE TIP HEX HEAD screwbolts
KINGSPAN TEK structural insulated panels (SIPs)
MI-TEK POSI open-web joists

3 envelope

FLAT ROOF COVERING
SIKA SARNAFIL G410-15 ELF PVC single ply roofing
KINGSPAN THERMATAPER TT47 LPC/FM tapered roof insulation
FIX-FAST SURE-FAST carbon steel fasteners and tube washers
DUPONT TYVEK AIRGUARD SMART vapour control layer

EXTERNAL DOORS, WINDOWS, AND ROOFLIGHTS
VELFAC RIBO composite front door
VELFAC 200 ENERGY composite wood/aluminium windows and glazed doors
VELFAC 280 ENERGY rainscreen panels
GLAZING VISION SKYHATCH roof access rooflight
GLAZING VISION FLUSHGLAZE multipart fixed flat rooflight

TIMBER CLADDING
KINGSPAN NILVENT breather membrane
SIBERIAN LARCH timber cladding boards
SiOO:X MID-GREY coating for an immediate and consistent silver-grey appearance
SPAX 25170004504521 partial-thread self-drilling facade screws VIEW ON AMAZON

SOFFIT CLADDING
KINGSPAN KOOLTHERM K110 soffit board insulation
FIX-FAST AFT self-adhesive heat-reflective aluminium foil tape

STANDING SEAM STEEL CLADDING AND ROOFING
COLOURCOAT URBAN standing seam roofing and cladding
WISA-SPRUCE structural plywood

4 interiors

INSULATION
KINGSPAN THERMAWALL TW55 wall insulation
ROCKWOOL FLEXI semi-rigid mineral wool insulation
ROCKWOOL ROCKFLOOR rigid mineral wood insulation/ resilient layer

INTERNAL LININGS AND FINISHES
WISA-BIRCH PREMIUM birch-faced plywood panels
FERMACELL gypsum fibreboard
BUTTON-FIX TYPE 1 concealed panel fixings – VIEW ON AMAZON
BUTTON-FIX TYPE 1 FLUSH concealed panel fixings – VIEW ON AMAZON
BUTTON-FIX TYPE 2 concealed panel fixings – VIEW ON AMAZON
DOMUS CRETA SLIM large-format lightweight-porcelain tiles
DOMUS FLOSS DLFS 01 NATURAL GRIP concrete-effect porcelain tiles
DOMUS WOOD FLAXSEED STANLEY engineered-oak flooring
AURO PLANTODECOR 524 premium washable solvent-free low-VOC (10 g/l) white matt emulsion wall paint – VIEW ON AMAZON
AURO 301 low-VOC (1g/l) plaster primer – VIEW ON AMAZON
AURO 261 water-based solvent-free low-VOC (10 g/l) clear matt silk lacquer – VIEW ON AMAZON
AURO 125 washable solvent-free low-VOC (1g/l) one-off oil wax – VIEW ON AMAZON
AURO 127 solvent-free odour low-VOC (10 g/l) hard primer – VIEW ON AMAZON
AURO 260-90 water-based solvent-free low-VOC (10 g/l) satin-finish wood paint

INTERNAL JOINERY AND DOORS
ECLISSE CLASSIC single sliding pocket door system
ECLISSE SYNTHESIS FLUSH HINGED pull door system with concealed frame and hinges
ECLISSE SYNTESIS FLUSH skirtings adapter and connectors for recessed and flush skirtings
CASSIOPEA satin chrome door handle set
FIRENZE satin chrome round flush pull handle set
PREMDOR FIRESHIELD LIPPED PAINT GRADE PLUS FD30 fire door

BLINDS
SILENT GLISS SGGB 4960 medium-duty motorised made-to-measure roller blinds
SILENT GLISS SGGB 4770 medium-duty motorised dim-out made-to-measure roller blinds
BLINDSPACE recessed blind concealment head boxes.

SANITARYWARE
DURAVIT ME BY STARCK 02530092 compact wall-mounted toilet – VIEW ON AMAZON
DURAVIT ME BY STARCK 233555 washbasin with overflow and 1 tap hole – VIEW ON AMAZON
DURAVIT ME BY STARCK 071945 handrinse basin with overflow and 1 tap hole – VIEW ON AMAZON
DURAVIT STARCK 700337 built-in bathtub with backrest – VIEW ON AMAZON
DURAVIT STARCK SLIMLINE 720115 shower tray – VIEW ON AMAZON
GROHE ESSENTIALS 40689001 toilet roll holder – VIEW ON AMAZON
GROHE ESSENTIALS 40374001 toilet brush set – VIEW ON AMAZON
GROHE ESSENTIALS 4036500 towel ring – VIEW ON AMAZON
GROHE EUROSMART COSMOPOLITAN 23325 basin mixer tap – half inch medium-size – VIEW ON AMAZON
GROHE 40564 chrome finish bottle trap – VIEW ON AMAZON
GROHE EUPHORIA 180 27475 shower system with bath thermostat for wall mounting – VIEW ON AMAZON
GROHE EUPHORIA 180 27296001 shower system with thermostat for wall mounting – VIEW ON AMAZON
KUDOS INSPIRE 4BASCDUORHS two panel in-fold glass bath screen – VIEW ON AMAZON
KUDOS PINNACLE 8 P8HR90L shower screen with left-hand hinged door for recess – VIEW ON AMAZON

KITCHEN FITTINGS AND EQUIPMENT
KOIVU KITCHENS plywood made-to-measure units and fronts
HI-MACS natural acrylic stone solid surface worktop with integrated splashback
PFEIFFER MIXA 871 R60 03 WHITE solid surface undermount sink with stainless steel bottom
QUOOKER FLEX boiling water tap – VIEW ON AMAZON
BOSCH SERIE 6 KIS86AF30G built-in fridge/freezer – VIEW ON AMAZON
BOSCH SERIE 8 BLACK BFL634GB1B built-in microwave oven – VIEW ON AMAZON
BOSCH SERIE 8 BLACK HBG634BB1B built-in oven – VIEW ON AMAZON
BOSCH SERIE  4 BLACK PUG611BF5B induction hob – VIEW ON AMAZON
BOSCH SERIE 6 DHL575CGB stainless steel canopy cooker hood – VIEW ON AMAZON
BOSCH SERIE 6 SPV66TX00G built-in slimline dishwasher – VIEW ON AMAZON
BOSCH SERIE 6 WKD28541GB built-in washer dryer – VIEW ON AMAZON

5 services

FOUL AND GREY WATER DRAINAGE
WAVIN OSMA UNIVERSAL 450mm diameter inspection chamber
WAVIN OSMA DRAIN below ground PVC-U gravity drainage system
WAVIN OSMA SOIL PVC-U push-fit ring-seal above ground soil drainage system
WAVIN OSMA WASTE PVC-U PP push-fit above ground waste drainage system

SURFACE WATER DRAINAGE
WAVIN OSMA RAINWATER 3S414 82mm diameter PVC-U SW/S domed roof outlet – VIEW ON AMAZON
WAVIN TWINWALL surface water and stormwater drainage
WAVIN AQUACELL ECO 6LB025 recycled polypropylene modular soakaway units
WAVIN OSMA GEOTEXTILE non-woven filtration layer

WATER
WAVIN MDPE 25PW050 25mm blue solid wall WRAS approved PE-80 polyethylene supply pipe – VIEW ON AMAZON
GROHE SENSE GUARD smart water controller – VIEW ON AMAZON
GROHE SENSE smart leak detectors – VIEW ON AMAZON
WAVIN HEP2O HX43/22W internal stopcock
WAVIN HEP2O push-fit potable water system – VIEW ON AMAZON
EDDY electronic water descaler – VIEW ON AMAZON

HEATING AND DOMESTIC HOT WATER
NIBE F2040-8 air source heat pump (ASHP)
NIBE VVM S320 indoor module
NU-HEAT SM14 FAST-FLO underfloor heating (UFH) system
NU-HEAT LO-PRO 10 underfloor heating (UFH) system
STELRAD CONCORD heated towel rail

VENTILATION
ENVIOVENT ENERGI SAVA 300 PLUS mechanical ventilation heat recovery (MVHR) system

ELECTRICAL
smart home
LOXONE hard-wired cloud-free integrated smart home system
main distribution board
FUTURE AUTOMATION LXN5 enclosure
LOXONE MINISERVER 100335 smart home miniserver
access control and security
LOXONE NFC CODE TOUCH TREE 100300 access control pad
LOXONE INTERCOMM 200093
LOXONE ALARM SIREN 100313
lighting and lighting control
LOXONE TOUCH touch switch
LOXONE TOUCH PURE touch switch
LOXONE TOUCH SURFACE touch switch
LOXONE LED CEILING LIGHT RGBW TREE 100288 ceiling light
LOXONE LED PENDULUM SLIM RGBW TREE 100308 pendant light
LOXONE WARM WHITE LED STRIP 5M LED strip
LUMI-PLUGIN LP110WH3K LED downlight
LUMI-PLUGIN LP110WH3KMPIR LED downlight with integrated plug-in PIR
LUMI-PLUGIN LP110WH3KMBWSA LED downlight with integrated plug-in smoke alarm
LUMI-PLUGIN LP110WH3KMBWHA LED recessed downlight with integrated plug-in heat alarm
DURAVIT LM7856-D LED MIRROR
shading control
LOXONE SHADING ACTUATOR AIR 100290 for wireless integration of motorised blinds
heating control
LOXONE VALUE ACTUATOR TREE 100225 for control of underfloor heating system
power
KNIGHTSBRIDGE SFR9224MW 13A 2-gang switched socket with dual USB charger – VIEW ON AMAZON
KNIGHTSBRIDGE SF8900MW 115/230V IP41 rated dual voltage shaver socket – VIEW ON AMAZON
KNIGHTSBRIDGE GDSF008MW IP20-rated 8-gang grid faceplate – VIEW ON AMAZON
ROLEC WALLPOD: EV READY (EVWP0020) socket charging unit – VIEW ON AMAZON
communications
KNIGHTSBRIDGE SFRJ45MW IP20-rated UTP CAT5e RJ45 network port – VIEW ON AMAZON
wiring
CUBIS STAKKA-BOX MODULA twin-wall access chamber
LOXONE TREE CABLE (100344)

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