Cavity wall woes

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I have hit upon a potential design and construction problem with the cavity walls.

My house is a rectangle with gable on each end. On one end of the house I have attached a flat roof utility room, right under the gable.

The wall cavity continues through the side wall, as if the utility room was not there!

It has now occurred to me that cold air circulating in the cavity will pass through the wall in-between the house and the utility room, thus stealing heat from inside the house.

It seems to me that during construction, we ought to have closed the cavity at the two points where the utility room meets the gable wall.

It is more complicated by the fact that there is gable wall above the flat roof.

I attach a simple diagram showing the ground floor and my supposed draft direction inside the wall cavity.
 

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When did you build the small room?

Isn't there any cavity wall insulation in it? if so there won't be much cold air flying about.

I've seen extensions as yours, some with the cavity carried over, and sometimes not.
 
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Side rooms were built at the same time and their walls are insulated, same as the rest of the house.

But, as the arrows show, we have a wall which runs inside the house and allows cold air to circulate inside its cavity.
 
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You're not making a lot of sense. Can you redo that sketch to show both skins of the walls.
 
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Don't think air, let alone cold air circulates around a cavity wall like a central heating circuit.
 

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