house brick for stand, quick quetsion

[stonecutter]

Re: house brick for stand, quick quetsion

i'm starting to wish i never ventured down the path of build WFO

*sigh* Read this again.....You don't have a serious problem or one that is going to ruin your oven. Watch it, and if things change you have a solution.

Just cure it and start enjoying it.

[CrocAu]

Re: house brick for stand, quick quetsion

btw stonecutter, i really appreciate your help and all the info (same goes for everyone else posting before) and hope you keep eye on my thread as i'm sure i will be needing more cheering up soon

it was great relaxation task with my oven till yesterday when my slab cracks started

[CrocAu]

Re: house brick for stand, quick quetsion

i'm looking at my early photos in this thread with stand before the slab and wondering how the hell i got here, even with the support wall in the middle and each corner and middle of the back having tied in 2nd wall of bricks, also concrete was 32mpa and 110mm thick plus a lot of rebar i'm looking at serious problems?
i'm starting to wish i never ventured down the path of build WFO

[stonecutter]

Re: house brick for stand, quick quetsion

DON'T PANIC...It's not a big deal. It's also possible that the cracking is caused by the concrete shrinking, and since it's tied into the walls, you get some cracking there too. But over the internet diagnosis usually lends itself to precautionary techniques.


Brace the underside of of the slab just as you would for the pour, except use angle iron or sistered PT lumber like a floor joist. For the braces you can use adjustable lally columns.

Again this is all precautionary...you should wait and see what happens over a few weeks.

[CrocAu]

Re: house brick for stand, quick quetsion

I feel that you need to add some braces to the bottom of your slab to relieve some of the load weight off the walls.

oh crap

can you please expand on what you have in mind and why so i understand what i'm looking at and how i go about adding the braces?

[stonecutter]

Re: house brick for stand, quick quetsion

in the stand brickwork yes, dome doesn't seem to be affected as far i can see inside.
at the back where the biggest crack is (0.5mm), it travels up in to perlite render as shown on photo but also it travels down 3 bricks and stops about half way in the middle of 4th brick.

the ones on the left and right that would be no more then 0.2mm don't cut in to brick work in my stand

I feel that you need to add some braces to the bottom of your slab to relieve some of the load weight off the walls.

[stonecutter]

Re: house brick for stand, quick quetsion

just to double check in regards to your comment at the very start of this post
I noticed just before that temperature was just over 65C on the bottom side of the structural slab some time after fire stopped, when i mentioned 45C before it was with mid-large fire going and I was expecting this to be the peak but it seem heat was moving slowly that way with whole slab acting as heatsink and got hotter from embers after longer period of time when i didn't even consider checking temperatures so yesterday could have been bit higher as well later on during the day after main fire died down but there was lots of embers inside.

That is not enough to crack a slab like that.

[stonecutter]

Re: house brick for stand, quick quetsion

yes i do plan to put something down to cover the slab now, wasn't before
most likely i will put tiles of some sort on top and the sides of the slab

I recommend an exterior uncoupling layer, which will prevent any cracks from migrating through your tile and grout.

[CrocAu]

Re: house brick for stand, quick quetsion

I am positive the cracks are not heat related, so you don't have to stop your curing schedule.

I would wait to do any exterior finishes ( stucco,brick...anything) before you get an idea how the slab will behave. Again, from your previous pictures, I feel that the strength of the slab is not compromised...but I am not there either. At the worst case scenario, you may have to shore the slab.

For now, don't worry too much and just keep an eye on it. The crack in your insulation will allow water penetration, so try and keep the whole thing dry as possible.

just to double check in regards to your comment at the very start of this post
I noticed just before that temperature was just over 65C on the bottom side of the structural slab some time after fire stopped, when i mentioned 45C before it was with mid-large fire going and I was expecting this to be the peak but it seem heat was moving slowly that way with whole slab acting as heatsink and got hotter from embers after longer period of time when i didn't even consider checking temperatures so yesterday could have been bit higher as well later on during the day after main fire died down but there was lots of embers inside.

[CrocAu]

Re: house brick for stand, quick quetsion

Croc, too late for that on yours, unless you plan on overlaying the exposed slab with something.

yes i do plan to put something down to cover the slab now, wasn't before
most likely i will put tiles of some sort on top and the sides of the slab

[CrocAu]

Re: house brick for stand, quick quetsion

I seriously doubt the floor got got enough to effect the slab.


Do you see any cracks running up the mortar joints in your brickwork?

in the stand brickwork yes, dome doesn't seem to be affected as far i can see inside.
at the back where the biggest crack is (0.5mm), it travels up in to perlite render as shown on photo but also it travels down 3 bricks and stops about half way in the middle of 4th brick.

the ones on the left and right that would be no more then 0.2mm don't cut in to brick work in my stand

[stonecutter]

Re: house brick for stand, quick quetsion

For anybody that may be reading this...a membrane (plastic sheeting) will stop slab cracking from migrating up into your cladding and/or dome.

Croc, too late for that on yours, unless you plan on overlaying the exposed slab with something.

[stonecutter]

Re: house brick for stand, quick quetsion

I am positive the cracks are not heat related, so you don't have to stop your curing schedule.

I would wait to do any exterior finishes ( stucco,brick...anything) before you get an idea how the slab will behave. Again, from your previous pictures, I feel that the strength of the slab is not compromised...but I am not there either. At the worst case scenario, you may have to shore the slab.

For now, don't worry too much and just keep an eye on it. The crack in your insulation will allow water penetration, so try and keep the whole thing dry as possible.

[CrocAu]

Re: house brick for stand, quick quetsion

just double checked it and yes the ones on the sides are right where the divider wall is

[stonecutter]

Re: house brick for stand, quick quetsion

I seriously doubt the floor got hot enough to effect the slab.


Do you see any cracks running up the mortar joints in your brickwork?