#1  
Old 09-23-2013, 12:00 AM
Serf
 
Join Date: Jun 2013
Location: Melbourne - Dandenong Ranges
Posts: 15
Default Fine Treated Perlite

Hi All,

For my 50mm outer layer (after blanket) a local company here in Melbourne has recommended 'FINE TREATED PERLITE' with a 1 - 2mm particle size for the Perlicrete coating. I am unsure as i have read elsewhere that a MEDIUM grade is better? What do the experts think?

The dome is ready, covered in blanket and chicken wire, I will be mixing at 10:1 Perlite: Portland Cement. Also, i have some refractory cement left over, could i use this up for the Perlicrete?

How far does a 100lt of Perlite go?

Thanks and regards...
Phil
Reply With Quote
  #2  
Old 09-23-2013, 05:56 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,735
Default Re: Fine Treated Perlite

There is a product used in the building industry that treats perlite with silicon which prevents water being absorbed into the perlite grains. Not sure if this is what your product is, but I would like to use it if it's available as the water absorbency is a problem, or getting rid of the water is at least. Most of the perlite and vermiculite used is for agricultural use and the grains ability to hold water is a desirable quality. I've never come across the silicon treated stuff in Australia, but believe it would suit our purposes better. Perlite tends to have a lot of fine dust which is quite irritating to breathe whereas vermiculite is less of a problem in this regard. The small grain size means that you will require more water when mixing rather than the larger grains. You don't say how big your oven is but you can work out the volume and add around 20% because you will lose some volume on mixing.

Last edited by david s; 09-23-2013 at 06:00 AM.
Reply With Quote
  #3  
Old 09-23-2013, 01:54 PM
Laborer
 
Join Date: Jun 2013
Location: Queensland Australia
Posts: 81
Default Re: Fine Treated Perlite

Why not just buy silicone waterproofing liquid and work that through the perlite
Reply With Quote
  #4  
Old 09-23-2013, 02:03 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,735
Default Re: Fine Treated Perlite

Quote:
Originally Posted by Toomulla View Post
Why not just buy silicone waterproofing liquid and work that through the perlite
That could well work. I haven't pursued that idea because I figured you'd need a lot of it and in a small batch would be not economic. Try it and report back.
Reply With Quote
  #5  
Old 09-26-2013, 01:09 PM
Serf
 
Join Date: Jun 2013
Location: Melbourne - Dandenong Ranges
Posts: 15
Default Re: Fine Treated Perlite

Thanks all, I have purchased the silicon coated perlite (from Exfoiliators, Melbourne) and will let you know how it goes.

Phil
Reply With Quote
  #6  
Old 09-26-2013, 10:44 PM
Peasant
 
Join Date: Sep 2011
Location: blenheim
Posts: 31
Default Re: Fine Treated Perlite

why not put a layer of ordinary mortar over the insulating layer? Mortar has some degree of water resistance, or you could paint it or treat it with silicon sealer....
Reply With Quote
  #7  
Old 09-26-2013, 11:22 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Fine Treated Perlite

Quote:
Originally Posted by tonybaker View Post
Mortar has some degree of water resistance
Not in the real world it hasnt, its like a sponge and sucks up moisture readily.
__________________
The English language was invented by people who couldnt spell.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #8  
Old 09-27-2013, 03:30 PM
Serf
 
Join Date: Jun 2013
Location: Melbourne - Dandenong Ranges
Posts: 15
Default Re: Fine Treated Perlite

Ok.... Yesterday I made a few batches of the perlicrete (10:3:1 perlite, Water, Portland) and managed to get it onto the dome around 2" thick, this morning it has firmed up but still appears quite crumbly, is this normal? What should the dry perlicrete be like? Will it get harder still over time or is crumbly normal?

Thanks
Phil
Reply With Quote
  #9  
Old 09-27-2013, 03:37 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,735
Default Re: Fine Treated Perlite

Phil,
The stuff only needs to strong enough for you to render over. Making it stronger by adding more cement just decreases its insulation capacity. Give it around a week to dry then start some fires (read the curing thread) After all the water has been driven out you can do the top render coating.Because you have the treated perlite you should not need to use so much water in the mix. I would guess 10:1.5:1 would be adequate, because the perlite grains are not sucking up the excess water.

Last edited by david s; 09-27-2013 at 03:42 PM.
Reply With Quote
  #10  
Old 09-30-2013, 04:15 PM
Serf
 
Join Date: Jun 2013
Location: Melbourne - Dandenong Ranges
Posts: 15
Default Re: Fine Treated Perlite

Hopefully the final question, then its all over....

After some searching i am planning to use this product as the sealer/waterproofer over the final render coat;

Brick & Render Sealer: Sealers: Crommelin
Does anybody have any thoughts on this? Is there a better way?

Cooked 7 loaves and 2 steaks on the weekend!


Phil
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
Perlite doubles as finishing structure? BrickPizzaMA Getting Started 1 05-04-2012 09:03 AM
Fine perlite verse loose fill for perl-crete mix? lplough Tools, Tips and Techniques 0 11-08-2011 07:45 PM
How fine should the sand be for home brew mortar? azatty Finding Building Materials 1 03-04-2011 09:36 AM
Perlite/Mineral Wool azpizzanut Tools, Tips and Techniques 6 11-28-2010 05:07 PM
perlite content waynebergman Getting Started 5 10-10-2007 04:21 PM


All times are GMT -7. The time now is 12:55 AM.

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