No.
Why not . ? Badly designed lean to?
What you have got won't comply with building regulations, and with such shallow roof supports any insulation would be a token effort at best, and do approximately nothing to reduce heat loss.
Not quite right, with no insulation U value would be in the region of 2.5 with 50mm celotex this would reduce to around 0.5 so about a 80% reduction in heat loss through the roof although the calculation is based on basic heat loss formulae and how it compares to floor/heat walls heat loss is something else to be considered
When they bought it (Jan) they had a see through plastic roof with 0 insulation. Now they have a plastic slate effect roof but it's been done appallingly. It will take some insulation but making the ceiling flat isn't an option as it would come below the opening for the kitchen and also be lower than the arch, which is the old back of the house.,
the gap to the outside there is so big you can fit your fingers outside. He said it was for airflow to stop the roof from getting mouldy. .
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