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Insulation of back wall & flue

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Hello new to the forum don't know how many times this has seen asked if a lot sorry. first I got hold of an old cast iron log burner done it up looks nice but I don't know what's the best & cheapest way to insulate the wood floor & the wood wall. I was told to use vermiculite sheet but the price it expensive. I wanted 8ft x 4ft sheet thought of masterboard but was told it was no good hope you all can help thanks
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Location: Upstate NY, zone 5
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See this thread for your floor:

For the walls, there are code specifications for clearances and materials. Newer woodstoves will have a nameplate which gives clearances, but an old one might not. This page from hearth.com gives what looks like good complete info:

In short, "24 gauge sheet metal installed on spacers 1” from an existing wall" will reduce the required clearance from 36" to 12". Read the whole article for a lot more important info. Unfortunately the page's links to NFPA charts no longer work, so you will have to look those up yourself.
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Location: Middle of Germany
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Hi David,

I recommend a product called "Promasil" made by Promat (Germany).
It is made from Calcium Silicate

Promasil has half the weight from vermiculite, much better insulation and a third of the price!

here you can find some (german) information:

here I found some info in englisch:

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