A slightly frustrating week; some landscaping, some late deliveries but a lot of decision making and ordering.
Not much else to see this week but much was achieved at the desk as follows:
The designs for the oak beams (at the front of the garage) were finalised
and ordered. Cost £1600, delivery 17
Roof trusses for the garage ordered. £1800, delivery 3 weeks.
Meeting with the basement manufacturer, Thermonex, and the order confirmed. The basement will be pre-fabricated in light-weigh concrete and will be delivered and erected in 3 days. The footings and slab will need to be prepared before-hand. All openings, doorways etc will be included and the internal walls will be finished ready to paint. It will be fully load bearing and work can continue immediately. Cost £27,000, delivery provisionally 17 December. This may sound a lot but at £346/sqm it is very competitively priced. See Links page for details of Thermonex.
More research into the heating system. I had provisionally decided to use a ground-based heat pump for domestic water heating and central heating via aluminium radiators. Air conditioning was to be separate (for 2 rooms only) and integrated with the whole-house ventilation system. I then discovered that heat pumps could provide heating and cooling. This led to considering Twin entry fan coil units rather than conventional radiators. These are individually controlled radiators which accept two feeds, hot and cold, and utilise a small fan to greatly improve efficiency. In the heating mode any heat pump will work, in the cooling mode, the lower temperature of air heat pumps (3C versus 11C) make them the preferred choice. The research continues!
Because of the high start-up demands of heat pumps I have decided to install 3-phase electricity supply. This costs £100 extra for initial connection but no additional on-going charges for domestic users. 3-phase is also more efficient and cheaper apparently. More research!
Next week will see the real building (bricks & blocks) get going!