Brick built outhouse insulation

29 Jan 2017
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United Kingdom

I had an outhouse built, 6m length, 3m width

The 4 walls are single brick (internally rendered) then 50mm EPS insulation 'dot and dabbed' followed by plasterboard and skim. The roof is a flat felt roof with 100mm mineral wool insulation, and the floor is a concrete slab.

A year later I find that the outhouse gets very warm in the summer to the point we leave the windows open in the summer to keep it cool. In the winter the temperature in the outhouse isn't cold, but even with the heating on it doesn't reach comfy temperature.

My question is; How can I improve the insulation/ What could be causing the outhouse to be stuffy and hot in the summer? I would have thought with the insulation levels it should be fairly cool in the summer.

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More insulation. Really you need at least 50mm in the floor, and 75mm solid in the roof. I think. What colour is it? A black felt roof will absorb heat....

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