Thanks both of you
These black houses originally had thatched or grass sods for roofs, but obviously not as effective as modern corrugated sheeting which replaced thatch after the second world war and on through the 60's and 70's, so it is now quite rare to see a genuine old black house still standing on Skye where I live, but there are still quite a few on the outer isles, but those that haven't been abandoned, have mostly been fully modernised and are being used for holiday rentals.
It really must have been a very hard life living under such conditions and in such remote areas back then, and by back then I don't mean that long ago at all really and definitely within my lifetime.
Dave