What Does This Heat Photo Show?

[Tim_Gilbert]

Thank you @Frank_Reif. Yes, I forgot to ask about the weather when the photos were taken. Wind washing is very hungry for household heat and nearly always not catered for.

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Rising damp - how do we remedy this?

My mistake, it’s called windwashing. This is where moving air permeates your insulation and replaces the air trapped in it. Instead of a nice consistent thermal gradient though your insulation you get cold patches. It is most often seen with glasswool in lofts but affects any fibrous or open cell insulation. [image] Having a vapour barrier over, and touching the insulation protects it from windwashing. Windwashing also introduces foreign matter into the insulation, which clogs the pores and ul…