Calculating BTU’s for hallways?

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I’m aware of how to calculate BTU’s but what measurements do I use for a hallway?

In my house the down stairs hallway is heated but the upstairs landing is not which I believe is standard practise. So does this mean the radiator downstairs heats upstairs too or do all the radiators contribute to this?

So for my downstairs hallway do I just measure the normal ceiling height?

Hope my question makes sense to you all.

Thanks
 
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Yes, heat rises, so the downstairs radiator also heats the landing which as you state is normal practice. Calculate it as two separate areas.

Imagine the stairs were removed and a floor/ceiling inserted. Based on that, calculate the downstairs BTU requirement and then the upstairs BTU requirement, then add the two together. Simples ;)

If the area under the stairs is already heated (eg cloakroom/wc) you can subtract that from the total afterwards, if you like.
 
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Better to measure in kW which is what everyone has used for the last 40 years.

Be aware using that method can cause the downstairs to be too cold and the upstairs too hot.

Not much you can do about that apart from having the rads downstairs and stopping up all draughts.

Tony
 

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