House features: Wall heating
(Natürliches Bauen, Koblenz, Germany)
An in-wall, low
temperature (30˚– 35˚ C) heating system which delivers radiant heat and
is hence ecologically and economically very efficient.
Why we chose it:
1. energy-efficient
2. no circulation of allergens through
convective air movement
3. very agreeable heating effect
4. keeps the walls dry
Pellet Boiler (Rika, Austria)
A 12Kw stove and back boiler that is
very energy-efficient (94%) and emits very little CO2 (less than 0.1%)
in the burning process. The stove radiates 15% of heat out into the
living room, the remaining 85% go into the wall-heaters. |
Latest case studies:
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Why we chose it:
1. only carbon neutral heating system available to viably heat the house
2. the stoves direct/ indirect heating ratio is ideal for our small living room
Reed board insulation
(Natürliches Bauen, Koblenz, Germany)
A breathable insulation
(thermal conductivity: ca. 0,056 W/mK) that also serves well as a base
for the wall heating and the clay plaster.
Why we chose it:
1. proven to work with our wall heating system
2. easy to install
Clay plaster
(Natürliches Bauen, Koblenz, Germany)
Breathable plaster that doesn't require any paint, can be easily repaired, is breathable, takes up humidity and looks beautiful.
Why we chose it:
1. proven to work with our wall heating system
2. has humidity-regulating properties
Casein paint
(Natural Building Technologies Ltd, Oakley, UK)
Used between joists and
wherever white clay was not practical. Casein paint is a solvent-free,
chalk and/or lime based paint with a matt white finish that mostly
comes in powder form and needs to be mixed with water. It is breathable
and helps regulate humidity. Where washability is important, however,
Casein paint is not suitable.
Why we chose it:
1. It's breathable
2. It's solvent free, hence does not aggravate any allergy problems
3. The
powder can be stored for a long time – good for a lengthy
building
process
4. The paint structure matches the clay aesthetically
Hemp/ recycled cotton insulation
(Natural Building Technologies Ltd, Oakley, UK)
Used in one wall without
heating to insulate both thermally and accoustically (thermal
conductivity: 0.040 W/mK) . According to the manufacturer hemp
batts can be used in loft spaces, between rafters and within walls and
floors. They are elastic and are easy to fit and hold between rafters
and in walls, without additional fixings. They are vapour open and
hygroscopic.
Why we chose it:
1.
Hemp/cotton batts can absorb and release moisture without degrading
and without loss of thermal
resistivity.
2. the
manufacturer claims that for every 1Kg of hemp insulation used
instead of mineral wool 1.4Kg
of CO2 is saved.
3. The
material does not aggravate any allergy problems (unlike sheeps
wool) and is easy to work with
Windows and doors
(Vrogum, Denmark)
Made to measure wood frames, double-glazed w. Argon, treated with solvent-free finish. U-value: 1.1.
Why we chose them:
1. solvent-free, they would not aggravate our allergy problems
2. they're
custom-made and so we could fit them to our extremely
differently
sized window openings.
3. They fitted the appearance of the house and neighbouring cottages.
4. The price. Replacing all windows (bar two) cost £5000
Lime screed
A lime screed floor maintains
the vapour permeability of the floor whilst incorporating insulating
and moisture-repelling properties (Leica).
Why we chose it:
1. we
needed to replace the old concrete slab which seemed to push
water up the walls with
an insulating floor which could also be a
damp-proofing
2. the embodied energy of hydraulic lime is less than that of Portland
cement.
A-rated energy-efficient appliances/ water-saving loo
We have an
energy efficient induction cooker and A-rated oven (Stoves), an A-rated
fridge and washing machine (Hotpoint Aqualtis and Electra retro fridge)
and a loo (Ifö) that uses 4 litres for a full flush and 2 litres
for a half-flush.
Oak floors from sustainably managed forests
(Old House Store, Henley on Thames)
The oak for our new floors comes from sustainably managed forests in Croatia. Used oak was unaffordable.
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