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Gypsum at bottom of rafter tips behind wooden fascia board

Part of my dwelling is in the roofspece of a building about 40yrs old. I noticed that there was large uneven amounts dusty gypsum covering the rafter feet/rafter ends/tips (sorry don't know the right word), which is behind the fascia board. This gpysum is along the whole of the roof in my home. What purpose does this gypsum serve please?

1 Answer from a MyBuilder Roofer

hi, its horse hair and lime, its what they used to use before roofing felt was introduced about 45 yrs ago. its main purpose was to stop draughs and to bond tiles/slates together. hope this helps


Answered 7th Aug 2017

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