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-   -   Re laying a firebox (https://www.contractortalk.com/f48/re-laying-firebox-311354/)

DLynch0009 11-24-2016 11:57 PM

Re laying a firebox
 
I have a fireplace in my basement I tend to burn wood in pretty much all fall and winter. Whenever the temperature requires it anyways. The room is a finished room under my garage, which has a suspended slab. The fire brick in the fire box are loose and need to be taken out and replaced and re laid. I'm a carpenter by trade but since I can lay tile I naturally have an unwarranted confidence that I can lay it myself. I know deep down that is not the case. My question is should I attempt this (I think the risks outweigh the money I'd save when dealing with fire). Or is it not that big of a deal and I should give it a shot? Fire brick seems pretty expensive for a rookie trial run.

brickhook 11-25-2016 07:02 AM

If you believe you can lay it, give it a try. If you dont do a good job, you can always redo it.

I have to say though, a firebox might not be the easiest thing to lay if you haven't ever laid brick. If I was you, I'd just hire a good mason to come by one day and lay it back in. It's hard to beat someone at their own game. :thumbsup:

Good Luck! Post some pictures :thumbsup:

JBM 11-25-2016 10:46 AM

If you do it, get some heatstop50 from a brickyard, mix 20oz or so, a small amount, at a time. Lay the bricks with either a margin or tuck point trowel.

To get the sidewall angles lay them out like this, you could put them the other way so you dont have so many courses as well. The bottom number is 17.5" make the top 14". Left is right , right is left.

http://i1114.photobucket.com/albums/...ps6mknte0c.jpg

JBM 11-25-2016 10:48 AM

I have a cheapo mitre saw with a 10" diamond blade. I cut the angles so I can run a brick past them, otherwise the corners dont rest on much, makes a crappy line sometimes.

JBM 11-25-2016 10:48 AM

Use the seams in the plywood to keep it square, for anyone with plywood :)

MikeFL 11-25-2016 12:44 PM

On top of the firebox is the throat and on top of the throat are the flue liners. That's a tremendous amount of weight. You can't just remove and rebuild the firebox. You're going to have a disaster on your hands.

What is the problem you are trying to fix?
Can you post a picture of your problem?

JBM 11-25-2016 02:31 PM

I took a firebox out wed, actually.

Kniggit 11-25-2016 02:33 PM

Uhm, when I build a firebox the throat doesn't sit on the firebox.

MikeFL 11-26-2016 08:39 AM

Quote:

Originally Posted by Kniggit (Post 5396202)
Uhm, when I build a firebox the throat doesn't sit on the firebox.

Are you laying a solid 4 behind the box and building a 4" throat on that?

JBM 11-26-2016 03:46 PM

1 Attachment(s)
Here is what im working on. It was actually a raised hearth too, had to remove 2" of concrete. Not fun.

superseal 11-26-2016 05:06 PM

Quote:

Originally Posted by MikeFL (Post 5395922)
On top of the firebox is the throat and on top of the throat are the flue liners. That's a tremendous amount of weight. You can't just remove and rebuild the firebox. You're going to have a disaster on your hands.

What is the problem you are trying to fix?
Can you post a picture of your problem?

And that advice is worth the price he paid for it. Masons like JB and I routinely rip out out fireboxes and re-build them...might wanna polish up your book smarts before posting ignorant information.

JBM 11-30-2016 07:15 PM

2 Attachment(s)
Might as well show completed pics, nothing amazing for sure, but bread and butter work.

WBCarpentry 11-30-2016 07:36 PM

Look good. I'd be proud of that.


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Fouthgeneration 12-01-2016 09:26 PM

JBM, your picture posted @ 10 above has given me another possibility to investigate on a smokey three flue chimney in a large farm house, I never considered, too save space, the original masons omitting a wythe of brick/block around the flue by-passing the higher fire box(es) as done in your photo.

Thanks for the posts and pictures, I'll post after New Years on the smokey farm flue, I am trying out a smart phone/ flue inspection camera cobble...:thumbsup:

superseal 12-01-2016 09:37 PM

J, looks like a fat joint for heatstop...you using regular mud on that one?

Turned out nice btw...

JBM 12-02-2016 06:50 PM

Nah it was heatstop, but I kicked it in on a Sat, roughed in and driving away by 12. I paid for it when I sponged it though, smeared a bit.


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