It's all about a balance between aesthetics, comfort and efficiency.
Aesthetics:You want to be as
close to the view as possible so that inside and outside feel connected. The glazed gable is a wonderful solution becuase it faces the best view (Saint's Bay), connects with the garden, and points SW giving good afternoon / evening light and sunsets.
Comfort:The glazed gable faces the prevailing winds and is in an exposed position. In winter there is a danger that cold air slides down the inside of the large glazed area and across the floor. We'll all have cold toes. In summer there could be too much 'solar gain' which would heat up the room inside making it uncomfortably hot.
Efficiency:The house and the heating system need to work together - they are effectively one system. It's just foolish to put in a good boiler and central heating system and then leak all the heat out of the house. It's damaging for the environment and our bank balance.
SO...
We want to have a glazed gable which is designed to maximise comfort and efficiency.
Consultation with Alan (thanks Alan) leads us to considering a buffer zone:
"A buffer is there to provide a tempered airspace and so minimise heat loss, prevent cold down-draughts, act as a protection against air penetration through the glazing system and to trap solar gains through the glass both for recirculation into the living space in winter and to exhaust externally in summer."A buffer zone is a space between 2 glazing sheets. They are commonly a single glazed outer layer, a gap, then a double glazed inner layer. The gap needs to be at least 500mm wide and cover the whole glazed area. You need to be able to get access for cleaning. The downsides are that they take up space and, we suspect, may 'distance' you from the view.
This will be a challenge for our architects.