[Ferro List] Mortar clean-up & fc drivel

[Peter Payne]

Thanks Chris. I'll see how it goes!
As to pure laminated FC--the increasing cost of steel motivates me 
towards systems like Doug's, especially given the need up here for 
substantial insulation. I remember a comment made to me by a guy who 
used skin-stressed cellular on Hawaii--can't remember his name, I think 
Doug knows him--when I mentioned Ferrocement: "I'm building houses, not 
boats!" At the time I found it a bit off-putting and dismissive, but now 
I can see his point: the super-performance of true FC may be overkill 
for a lot of applications. I generally get the feeling that what I am 
building is WAY stronger than it needs to be. Still, better than the 
other way round.
Peter

Peter

Christopher Glasspool wrote:
> Hi Peter,
> I've done this job before! An old wood chisel, pry bar, mason's chisel, star chisel, and pounding on the outside of the drum. This would be the time to also replace worn belts and bearing. Straighten out those metal flanges that have bent slightly, and replace that which is going to fold again - your judgment.
>  
> I'm convinced that thermal performance can be made OK by increasing wall thickness, or by having a thermal break - gap - vent space, or providing a layer of better performing material like foam. Construction really begins and ends with the cost imposed, and the jury is out for me as to whether a panelized system that stress skins the insulation is less expensive than a system that carries the stresses in one shell like traditional or laminated fc.
>  
> One lesson learned from boat construction industry is that if one or both of the skins de-laminates in the panelized systems due to a host of different reasons - thermal incompatibility, uneven load, poor mechanical adhesion, or moisture intrusion then very expensive weak spots will occur, and general distrust of the whole will follow.
>  
> In the beginning the term fc encompassed very strict guidelines that modeled material that acted more like steel than concrete in it's performance. In my lay person's sensibilities nothing but these guidelines give a true tensile and plastic material that meets this requirement. If I remember Naaman's guidelines correctly, increasing the neutral zone (which could be insulation) in the middle of the fc sandwich to more than 50% of the total sandwich thickness negates what he defined as fc. That doesn't mean that a material made to be different than this is not strong, it simply means that the material has moved into a different category than a material that moves and flexes in a unified steel like fashion. - Chris
>
>
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