Im going passive and my glazing orientation is south south west with few windows on North....what is the internal massive heat store you speak of or would recommend?
Insulation is low mass - mainly air held in cellular structuers- and doesn't store of transmit hear.
Concrete is as massive as it gets and is a monolithic structure which both stores and transmits heat.
If you were to face concrete with a dark stone directly bedded on it, like slate or granite, and allow the sun to shine on it it would gradually heat up.
When the sun shone elsewhere or went down, it would be likely to emit the heat, like a heat store.
So a living space with a dark stone floor could contribute significantly to the ambient heating of the house.
Conversely, allowing sunlight to shine on a relatively cellular material like a floating timber floor, i.e. one that is separated from the floor slab, will fairly have instant warm up, but equally quick heat loss and may contribute little or nothing back by way of releasing stored heat to the room
Light coloured timber would be the least absorptive and emittive.
Colour and mass are both important to a heat store in Ireland where the highest temperature may be in the high twenties.
Light-coloured stone buildings are effective heat stores in very hot countries.
Because the heat store is within the insulated envelope of the house, its a nett heat gain every day, with a slow release at night.
The slab is faced with dark material - I have suggested stonework - and insulated at the sides and below to prevent cold bridging leeching the heat our of it.
I hope that offers some insight into it.
This is the theory as I understand the matter BTW.
I cannot point to any worked examples I have done myself.
Happy to stand corrected by those claiming to know more on this.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.