Replies

1. 
   oops | Jun 13, 2013 02:15pm | #1

   fireplace

   It should be lined with firebrick.  Bottom, sides and back.  High heat and concrete not a good combination.  It would not pass any building code I know of.

1. 
   tylercc | Jun 13, 2013 04:49pm | #2

   cracked fireplace floor

   I agree but unfortunatly I am renting the house, the person who owns the house is a house inspector, so I don't know what he was thinking!!!!(There are a lot of questionable things like that in this house) I don't know what was used in the beginning, but if I used some refractory mortar would that solve the problem? So I don't have to pay for his mistakes.

1. 
   oops | Jun 13, 2013 05:09pm | #3

   I don't know of anything that will help.  It is just not designed as a wood burning fireplace.  Suggest you get a signed statement from the owner that you are not resposible for damage to the fireplace.

2. 
   DoRight | Jun 13, 2013 05:58pm | #5

   You could ... but

   You could patch it with motar of some kind.  Then again it is a rental.  But if it bothers you buy a few firebrick adn lay them in there.  You don't need to mortar them in there.  The purpose is just to keep teh heat off the cement.

   Problem solved

2. 
   Mike_Mahan | Jun 13, 2013 05:56pm | #4

   The key word is refractory. If you use fire brick you still have to use refractory mortar. Chances are the firebox was precast using refractory concrete. This would meet virtually any code. Refractory concrete is used to cast fireboxes and hotfaces for ovens and fire places. The only problem I can see is that your patch would have to be thick enough so as not to break because I'm not sure how well the patch would adhear to the bottom.

3. 
   oops | Jun 13, 2013 11:42pm | #6

   Fireplace

   DoRight.  Your idea would be better than trying to patch it as he was thinking.  The problem is that in time the back and side can spall also.

   Mike. If the fireplace is made of the material you are talking about,  why is it spalling?  Just a thought.

4. 
   Mike_Mahan | Jun 14, 2013 10:02am | #7

   Metal

   Cut a piece of metal to fit the bottom.

5. 
   tylercc | Jun 14, 2013 02:07pm | #8

   fireplace

   Thank you all for your solutions they have been very helpful. So lets say that the owner want to fix it(the right way) what should he do? and the reason why I am finding solutions to the problem is because if I don't he will either not fix it or take two years to fix it(not joking). So if I have the solution I might be able to get him to fix it in a couple months. 

6. 
   DanH | Jun 15, 2013 04:58pm | #9

   If the fireplace is resting on fireproof materials below (concrete slab, eg) then it's not clear that anything needs to be done.

   The most logical "fix", if needed, would be to dry-set half-thick refractory brick, or install a panel of some other refractory material.

   The damage may be due in part to building fires directly on the floor vs using a proper fireplace grate.

1. 
   Mike_Mahan | Jun 15, 2013 10:14pm | #10

   Could be....

   Could be that beating on the fire with a poker would cause some damage.

7. 
   Jeeptj12 | Jun 18, 2013 07:40am | #11

   To do this right I would line it with firebrick.  At least line it with firebrick splits and refractory mortar.  The only other thing that could be done is chip out the concrete down to the mesh and then patch it with a refractory concrete.  If the owner wants a quick fix which I don't recommend, he could use a modified thin-set like flexbond to parge the area.  I'm guessing it will delaminate in the future though.

8. 
   IdahoDon | Jun 26, 2013 01:25am | #12

   If you're in a place where materials are hard to come by just google pizza oven supplies and you'll get a number of places for refractory mortor, fire brick, and other such things.

   since it's a rental I'd probably just pick up a couple of large pizza stones and cut them to fit.  A diamond blade will cut through them no problem.