The bricks surrounding my fireplace have cracks between them. It's as if the thermal expansion/contraction has eroded the mortor between the bricks. I have had some serious fires in there and haven't had a problem but I am worried that the lack of grout may be a fire hazard. Is there a grout or mortor than I can force into the cracks?
Best Answer
Sure, you can re-cement those. You'll want to dig them out as much as you can, rinse them out with water, let dry, spray with water to wet them & then force in the new cement.
You can put a batch in a Zip-Lock type bag & cut off a tiny bottom corner of the bag to squirt the mortar into the joints. Below, is what the Home Improvement stores offer. The Bucket is good for up to 3000°F & tubes are good for up to 2000°F.