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-   -   Filling the gaps with mortar (http://www.fornobravo.com/forum/f8/filling-gaps-mortar-17290.html)

scottsummers 01-25-2012 03:14 AM

Filling the gaps with mortar
 
Ok some I'm a newbie and have just finished the dome (see my build Scotty 36 sunshine coast, Australia) I'm not a master brick layer, I'm a helicopter pilot. Some of my joins on the oven side are not ideal, not terrible maybe 5mm gap here and there, can I just climb inside and use the same mortar to fill the gaps from the inside? I'm using a mix of fire clay/cement/lime/sand so far to stick the dome together. I have heard that cement can break down under xtreame heat, so would my planed mix work?!?
The mix is 10 sand/6 fire clay/3 lime/2 cement.
Thanks
Scotty

david s 01-25-2012 03:58 AM

Re: Filling the gaps with mortar
 
The consensus seems to be that any breakdown of the Portland cement is compensated for by the lime.
The usual mix is sand, fireclay, lime, cement 3:1:1:1 Your brew is pretty close, but has more fireclay. Too much clay can create excessive shrinkage, but you should be ok.

doctorphreak 01-25-2012 09:24 AM

Re: Filling the gaps with mortar
 
question about the heat could a person add more lime to the mix maybe like
3:1:2:1 to help with the heat more ?????

robinwham 11-14-2013 01:09 PM

Re: Filling the gaps with mortar
 
Hi, I have just closed the dome on my 37-in Pompeii, and notice some mighty large :( gaps in the inside joints. Did you end up filling them, (I'm using refractory mortar), and if so, how? Did it work out well? Appreciate any responses!

cobblerdave 11-14-2013 01:30 PM

Re: Filling the gaps with mortar
 
Gudday
I had the same and couldn't help myself and disregarded good advice and crawled in and patch a small section. They were right it didn't work and fell out.
Just live with it,its a dome and is strong for that reason not pretty brickwork.
Regards dave

robinwham 11-14-2013 04:32 PM

Re: Filling the gaps with mortar
 
Thanks Dave...are you sure?? I don't know if I can stand it. These are some pretty big gaps. Thought I'd use a pastry bag or a huge syringe to squish some mortar in...sigh...

boerwarrior 11-14-2013 04:45 PM

Re: Filling the gaps with mortar
 
So Scotty,

I have to ask! What's harder?

Flying a helicopter or building a wood fired oven? :)

cobblerdave 11-14-2013 06:16 PM

Re: Filling the gaps with mortar
 
1 Attachment(s)
Quote:

Originally Posted by robinwham (Post 165475)
Thanks Dave...are you sure?? I don't know if I can stand it. These are some pretty big gaps. Thought I'd use a pastry bag or a huge syringe to squish some mortar in...sigh...

Gudday

Attachment 40195

No one sees it anyway so you will learn to live with it. And because you introduced some some stress relief points you shouldn't get any cracks!
Only the real tight builds seem to gets visible cracks
Regards dave

robinwham 11-14-2013 06:50 PM

Re: Filling the gaps with mortar
 
OK Dave, I don't feel so bad (although I think your "inside" looks better than mine). My concern was heat retention without all the gaps full of mortar. But clearly, you're the boss here...nice "white" dome! I can't wait to fire the oven up (not quite there yet...)!

wotavidone 11-14-2013 09:38 PM

Re: Filling the gaps with mortar
 
I'm a little bemused by gaps, especially when using the homebrew.
Why don't people just butter the brick with so much mortar that when they set it in place the excess squeezes out through the gaps, then scrape the excess off with the trowel as they go? Worked for me.
Only time I see this not working is if the dome is built on a sand form instead of using an IT


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