I have to make a decision soon as i need to buy the insulation tomorrow. The cal-sil is rated at 1,200F density is 15 lb, dimensions are 12x36x2 , and its $10 a board, at that price i can double it and get a 4 inch insulation under the bricks. Is this overkill?. Or my other option is getting ceramic fiber, rated at 2,800F , density is 17 lb, dimensions are 24x36x2. The box comes with 3 boards and costs about $115. Please take a look at the specs, specifically the density. I would greatly appreciate the feedback. Thanks
Forum Issues Update
Things are progressing in getting things back in order on the Forum! User avatars should be showing up. Attachment and inline images are in the process of being uploaded. We are still looking for a migration path for the Photoplog gallery. Thank you for your patience!
Calcium silicate or ceramic fiber board