Oregon's nickel's worth
My hunch, possibly in addition to holes reducing the amount of clay  
needed and also shipping weight, has to do with what I learned working  
with clay. Clay, under the vitrification process (this is higher- 
fired, not low-fired clay), shrinks a lot and is subject to cracking  
as temps go up then down. The holes would provide for the changing  
temps to more easily be distributed through the clay body. Thus, less  
cracking, crazing, warpage. I'd guess this would be true whether the  
bricks were packed or extruded.

Mary

----------------------------------
Mary Tegel
hands on impresario
Tegel Design + Planning
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On Mar 26, 2010, at 10:47 AM, Gabriel Orgrease  
<[log in to unmask]> wrote:

> On 3/26/2010 1:30 PM, [log in to unmask] wrote:
>> Perhaps there is confusion between "Hollow Cavity Walls" and "Cored  
>> Brick"?
> steve,
>
> yeah, I don't quite buy the hole in the brick being meant for  
> ventilation, yes on saving weight and a little bit on raw materials
> and the few times I worked on a brick line (never got past  
> lunchtime) I got the impression the intention was for the mortar to  
> go in the holes for additional holding
> no way in Hades anyone gonna lay a brick w/out getting mortar in the  
> holes
>
> ][<en
>
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