#11  
Old 08-08-2009, 07:15 PM
jmhepworth's Avatar
Journeyman
 
Join Date: Feb 2008
Location: Kaysville, Utah
Posts: 291
Default Re: Mortar not sticking

I'm by no means a brick mason, but this is my experience. The mortar needs to be the consistency of peanut butter. If it's too wet, the bricks slide all over. If it's too dry, it doesn't adhere well. The Heatstop manufacturer made three recommendations to me. (1) Make sure the bricks are wet. I soak them and have had good success. If the brick is dry it sucks the moisture out of the mortar, as David pointed out. (2) Mix only what you can use in a few minutes. You cannot reconstitute refractory mortar like regular mortar by adding water to it. When it begins to set, it's not any good anymore. (3) mix with cold water. Warm water apparently starts the chemical reaction too quickly.

I make sure I press the brick into place so that mortar oozes out. For goo measure, I tap (sometimes it takes more of a smack than a tap) the brick with the butt of my trowel to set it into the mortar. I have no idea if that helps, but it seems to get the brick to stay in place a bit better.

I have 8 courses in plus the soldier course and have not had to use any support. Heatstop is very sticky.

Joe
Reply With Quote
  #12  
Old 08-08-2009, 07:47 PM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: Mortar not sticking

Quote:
I called the manufacturer of Heatstop 50, which is what I am using for my oven. I asked them if the firebricks should be soaked in water prior to mortaring. They said absolutely not!
Quote:
The Heatstop manufacturer made three recommendations to me. (1) Make sure the bricks are wet. I soak them and have had good success. If the brick is dry it sucks the moisture out of the mortar, as David pointed out
I'm a little conused here, Or is the Heat Stop company a little conused ?

Any Comments
Reply With Quote
  #13  
Old 08-08-2009, 07:59 PM
pizza_bob's Avatar
Apprentice
 
Join Date: Apr 2008
Location: Oxford, CT
Posts: 179
Default Re: Mortar not sticking

Ugh!
I spoke to the manufacturer last week and they said the bricks should not be soaked. I'm just as confused too now!
I find it difficult to believe that there is not a professional mason on this site that knows how to use Heatstop 50 the correct way. It seems like it would be a balancing act of sorts...If you soak the brick then you can go with a slightly less water-downed Heatstop 50 mix. But a less water-downed mix then would suck moisture from the soaked brick and then have too much water in the joint. If you don't soak the brick then the water will go from mortar mix to the brick.
__________________
My Oven Progress:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


If you fail to plan, you plan to fail!
Reply With Quote
  #14  
Old 08-08-2009, 08:10 PM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: Mortar not sticking

Hi Bob,
If this helps you at all, I briefly dipped my bricks in water before I laid them on heat stop that was mixed to a consistency of peanut butter. It has been three months now and i've have many fires and bakings and havent developed a single crack yet, And I have looked in the dome with a flashlight ater the oven has cooled down.

I just find it kinda strange that heat stop is giving out different information, Does anyone have a bag they can read and tell us if it says anything on the bag ?
Mark
Reply With Quote
  #15  
Old 08-08-2009, 08:34 PM
pizza_bob's Avatar
Apprentice
 
Join Date: Apr 2008
Location: Oxford, CT
Posts: 179
Default Re: Mortar not sticking

Quote:
Originally Posted by ThisOldGarageNJ View Post
Hi Bob,
If this helps you at all, I briefly dipped my bricks in water before I laid them on heat stop that was mixed to a consistency of peanut butter. It has been three months now and i've have many fires and bakings and havent developed a single crack yet, And I have looked in the dome with a flashlight ater the oven has cooled down.

I just find it kinda strange that heat stop is giving out different information, Does anyone have a bag they can read and tell us if it says anything on the bag ?
Mark

Mark,
Yes that is reassuring to hear you have no cracks!
I went to the manufacturer's website and found the follwoing information and attached PDF. No mention of soaking bricks though...

Heat Stop - High Temperature Resistent Refractory Mortar
Attached Files
File Type: pdf heatstop50.pdf (23.1 KB, 131 views)
__________________
My Oven Progress:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


If you fail to plan, you plan to fail!

Last edited by pizza_bob; 08-09-2009 at 04:41 AM. Reason: Mispelled Mark's name. :-)
Reply With Quote
  #16  
Old 09-26-2009, 07:46 AM
Peasant
 
Join Date: Jul 2009
Location: pittsburgh pa
Posts: 29
Default Re: Mortar not sticking

Quote:
Originally Posted by enasfournos View Post
Hello.....
Have the same problem using fire clay,does any one know the correct ratio to mix cement and fire clay?
Have mixed 1:1 no luck, can't get it to stick to fire bricks,also tryed 2:1 no luck.if anyone knows the receipe please reply.
Thanks
gd
i used 10 sand, 6 fireclay and 2 PCL (portland cement and lime mix)

i put about and inch or beter of this mix around then entire oven as each chain was placed. i had a bucket of water with a sponge handy. after each ring i would gently sponge the inside to remove excess or to fill any voids. this alos kep tht efirebrick damp for the next ring. i woudl spread a bit of the fire caly for 1 brick, dip the brick in the bucket of water and put into place. it gives just enoug time to tap it into place but doesn't suck out the water immediately. with this mix i did the entire dome with the exception of the very top nearly form free.

hope that helps.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
High Heat Mortar Primer james Getting Started 80 01-27-2014 06:40 PM
Can I use insulating vermiculite concrete instead of mortar clading waynebergman Pompeii Oven Construction 4 12-30-2009 06:20 PM
Refractory Mortar Vs. Regular Mortar OvenBoy Design Styles, Chimneys and Finish 7 10-09-2008 02:56 PM
Mortar thickness in the arch? dbhansen Pompeii Oven Construction 3 08-20-2008 03:08 AM
Fire Mortar vs. Refax Refractory Mortar southpaw Pompeii Oven Construction 4 04-07-2007 05:02 AM


All times are GMT -7. The time now is 02:26 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC