Just got this from Germany. I don’t know about fire or vermin hazard, but it looks like it was used extensively at one time.
“An insulating material consisting of dried eelgrass held between layers of cloth or paper; once used as thermal insulation, now little used.
dear mr. kahn,
we love your books, they are great inspiration for us.
we want to ask you: have you ever experienced insulating houses with eelgrass?
we are great fans of eelgrass, it is possible to collect it from the coasts almost all over the world. in danmark and in some other countries there are roofs thatched with eelgrass/seagrass, they protect the houses for several centuries.
we just started to deal with it in germany and would like to pass on the impulse to other countries because it is such a wonderful material and we don`t know any other insulating material which is as ecological as eelgrass.
it is funny: we found in the internet an advertising of cabot`s quilt from boston in the year 1912/1926. there is much information in it which is relevant to our days, too. for example: in the plant is much silicate, this has the effect that it doesn`t rot and it doesn`t burn.
we hope we aroused your curiosity now.
swantje and joer”