Bet that topic got a few people nervous... Well, the other day it was kinda chilly here, around 60, and the kids decided to go in the pool. (amazing eh?) I figured it was a good time to get a fire going in the outside fire pit, plus I had a fair amount of waste wood I needed to get rid of. Pine sticks 1-2" and 5' long, and some pine rounds that I think might have some nails in them, so off goes a fire. Just for kicks in the past I wanted to see how fire tolerant some patio blocks were, so I put them in the fire...about 20 minutes and they would crack in many places. Just for the heck of it I decided to toss in a couple bricks the other day, to see how long they would last in the middle of a roaring fire. They went the length of the fire...about 6 hours. No ill effects. So the question is... If/when I eventually get around to building a fire pit outside for my evening summer fires, does it really need to be made with a firebrick interior? My Plan is to make it quite large like 3-4' square so I'm less limited in size of logs that can be tossed in. I know I've kicked this around some before, but what the heck...It's only Craig's disk space we're using up.