Question About Fire Bricks

[E's Smokin]

When using fire bricks, do you just line the fire box with them or do you put them in the Cook Chamber as well for thermal mass
I'm new to this & if I decide to do this I just want to do it right the first time
Thanks again for all your help

E

 

[lemans]

I have 3 rows of three lining the cooking chamber for thermo mass.. prevents temp swings a lot like the water pan in my WSM