Insulation of back wall & flue

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

See this thread for your floor:
https://permies.com/t/49825/wood-burning-stoves/build-hearth-house-doesn-burn

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:
http://www.hearth.com/econtent/index.php/articles/wood_stove_clearances_installing_it_safely

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.

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:
http://www.wolfshoehe.de/wt/fileadmin/wolfshoehe/template/downloads/gb/Promasil_950_KS.pdf
http://www.schamotte-radeburg.de/fileadmin/firm_admin/pdf/datprow.pdf
http://www.promat-hpi.com/downloads/get/de-DE/E7779B63B4B04D0F8BD9F147F7C5AA69

here I found some info in englisch:
http://www.promat-hpi.com/en/products/calcium-silicates
http://www.amazon.co.uk/Promat-PROMASIL-950-KS-Insulation-Protection/dp/B00NB2XZLU





Konstantin