Lift a gas insert a "bit"?

[ChipinNE]

I want to add a bluestone hearth slab to my existing fireplace. I have a Heat & Glow FB Grand LP Insert in an all-brick fireplace. The problem is that a 1-inch or 1.5 inch slab will prevent me from opening the access door at the bottom of the insert. Can I safely raise the entire firebox insert to clear the new slab? If so, what kind of material would I use? (I have room above the insert). PS - I didn't install the unit, but I just replaced the thermocouple in this insert, so I am pretty familiar with the "insides". My assumption is that there is enough "play" in the gas line and electrical connection (blower) to move "up" 1 inch.

 

[DAKSY]

If you're talking 1" exactly, you can use doubled up, 1/2' Durarock strips, 3-4" wide running from front to back on both sides of the box...

 

[ChipinNE]

You mean Durock cement board like this?

http://www.homedepot.com/p/DUROCK-N...in-Cement-Board-172965/202263276#.UpzCIeJSQcs

thank you.

 

[DAKSY]

Yep. Cut (or snap) them to the full depth of the firebox, so that 's supported from front to back. Doubled will make one inch,
so with the firebox on the durarock & the surround on the 1" stone, everything will sit level...