Several decades ago I lived in a brick house in the UK. We had the cavity walls filled with urea formaldehyde foam. It outgassed so strongly for several days that we couldnt use the kitchen. (I guess there were holes where pipes went through the wall.) We had to keep windows open until the smell and stinging eyes sensation stopped.
But we haven't developed cancer.
And now we live in a reinforced concrete house in Greece with external polystyrene foam insulation.
EDIT. Actually the house has a reinforced concrete skeleton with hollow brick infill and a cavity between the infill walls.
Several decades ago I lived in a brick house in the UK. We had the cavity walls filled with urea formaldehyde foam. It outgassed so strongly for several days that we couldnt use the kitchen. (I guess there were holes where pipes went through the wall.) We had to keep windows open until the smell and stinging eyes sensation stopped.
But we haven't developed cancer.
And now we live in a reinforced concrete house in Greece with external polystyrene foam insulation.
EDIT. Actually the house has a reinforced concrete skeleton with hollow brick infill and a cavity between the infill walls.
Wood is incredibly expensive here.