 Re: Waterproofing the blanket
Sorry, re reading the post above, I need to add that the aluminium foil will maintain the humidity inner the oven structure, closing the path of the hot gases to the external next layer (that may be the cladding, depending on your construction).
The only place where could be good to put aluminium foil is over the vermiculite, or under the roof, just to wheather protection.
Luis |