[Ferro List] dougs fc parabolic video

[Peter Payne]

Doug,
Thanks a lot for the great info.
So, the slip coat goes on immediately after the initial plastering? Or 
the next day? Or is that a second skim the next day? And it gets brushed 
on? I'm not familiar with using a brush for this. Is this mainly to 
provide a hard smooth finish? Does it also help with permeability?
Wow, a lot of question marks! Thanks for any help.
Peter


Doug Lacy wrote:
> Oakridge has a program for creating computer models for thermal performance on alternative home desigs.
> If I were plastering by myself, I would only do a half a wheel barrel at a time and then plan on making a second coat later so you are not rushed to get it perfect by yourself.  Also, carefully measure out the area you are going to plaster and do half of it, and finish it all the way and then do the other half.  That way you are not having to go in overdrive.  The mix in the wheelbarrel will last longer than the mix on the wall.
>
> I have thought about the one man operation a lot.  4 wheelbarrels may be too much for a  day with one guy but, doing the half batches that will plaster 25 square feet.  If you break that down into two bites at a time, that is 12.5 square feet or an area of about 3 feet by 4 feet.  That is about as large of an area I would attempt in one bite.  It would still be a little rush to get that shell all done but it it is going to be two coat, meaning another skim the next day or so, then you can quickly brush that area with a fresh slip of cement and water
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> Another key plan for making the one-man operation work, or just a smoother operation for the regular 4 man crew, is to make ready two dry mixes of the cement slip.  Whip up the first right when you start to plaster you first 12 square foot patch.  And the second right befor you do the other.  Usually we mix a big bowl of cement powder and water when we start.  The problem with that is that you end up adding more and more water to the slip to make it brushable.
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> When you brush on freshly made cement slip over freshly applied plaster, it does the most good because it lets you brush plaster that would otherwise be way too wet for a standard wet brush or float, you still have to wait a bit, and it makes a very hard finish while wipping out the surface pores.  
>
> Trying to do this with an old watered down slip starts to cause water runs and dusty flaky finishes.  Even if you were doing a scratch coat, I would use the slip to help the thinshell keep its moisture, plaster over it and apply another one.  A big waste of cement it may seem, but if is done right it really helps one man show.
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