Porta de cortiça

I admired it so often, this door covered with cork from one of the streets of Monsaraz. And then, a few years ago, it disappeared and was replaced by a wooden door. While I was visiting Convento da Arrabida earlier this month, I came across such a door covered with cortiça again and I remembered the Monsaraz one. Is it aimed at protecting houses from noise, from the heat, cold, fire or the four altogether?