Uneasy about roofing with coated metal shingles over wood shake?

Question

I am planning to place a steel shingle roof over a wood shake roof.

I will add a 1 1/2 inch insulation blanket with radiant foil in between the 2 by 2 supports.

Two questions.

Does leaving the shake under the steel make the roof more susceptible to fire

Should the foil on the insulation go up or down. If up it is touching the steel. If down it is a 1/2 inch above the shakes.

Answer 1

The foil should always face the out side, and I don't believe you would be in any more danger of a fire them what you had already been.