I have two cement/fiber mix pads under my PBC on my Trex deck. They are large enough that any flying cinders land only on them--so far, anyway.
In addition to not wanting to catch your deck on fire, you also want to protect it from damage due to chronic heat exposure. That's why I like those cement board mats. I can even set the empty hot chimney on it with no worries. I get them at Lowe's for around $35.
One mat would probably do the trick, but I often let my PBC burn down with the lid positioned half or completely off, and that fire gets hot, so I took the extra precaution of stacking two of them.

Kathryn
In addition to not wanting to catch your deck on fire, you also want to protect it from damage due to chronic heat exposure. That's why I like those cement board mats. I can even set the empty hot chimney on it with no worries. I get them at Lowe's for around $35.
One mat would probably do the trick, but I often let my PBC burn down with the lid positioned half or completely off, and that fire gets hot, so I took the extra precaution of stacking two of them.
Kathryn








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