The original house had air bricks in the rear wall. Because the house is built on a slope, these would have been about 1m above previous external ground level.
Since then an extension has been built on the rear of the house (10 years ago). The air brick now vents the underfloor void of the house directly into the extension. This makes the extension very cold and draughty. It seems like a stupid idea, no idea why it was done like that - any good reasons I haven't thought about?
The offending airbrick now has a louvre over it, and is about 25cm above the extension floor level (extension floor lower than house floor). I want to block it up to make the extension warmer, and to avoid warm air going from the extension into the floor cavity of the house. If I do block it up I need to replace it somewhere else. I *think* I can put another brick in the original rear wall of the house to one side of the extension (small gap, might fit). I would then still have ventilation through from front to back of the house. Does this seem a sensible course of action? The only other alternatives I can see are 1, leave it where it is (not happy with that), or 2, find a way to duct it from where it is to the outside (can't see that looking very good!).
Advice appreciated, many thanks.
Since then an extension has been built on the rear of the house (10 years ago). The air brick now vents the underfloor void of the house directly into the extension. This makes the extension very cold and draughty. It seems like a stupid idea, no idea why it was done like that - any good reasons I haven't thought about?
The offending airbrick now has a louvre over it, and is about 25cm above the extension floor level (extension floor lower than house floor). I want to block it up to make the extension warmer, and to avoid warm air going from the extension into the floor cavity of the house. If I do block it up I need to replace it somewhere else. I *think* I can put another brick in the original rear wall of the house to one side of the extension (small gap, might fit). I would then still have ventilation through from front to back of the house. Does this seem a sensible course of action? The only other alternatives I can see are 1, leave it where it is (not happy with that), or 2, find a way to duct it from where it is to the outside (can't see that looking very good!).
Advice appreciated, many thanks.
