[Ferro List] 3 questions for Walter

[Walter Jeffries]

On Feb 26, 2008, at 11:36 AM, Rex Tarr wrote:
> you said:
>> Both, we experimented with everything from no steel (just PVA) to  
>> lath
>> +PVA to rebar, lath and PVA to rebar, lath, 661010WWM and PVA. PVA
>> laminated fc on lath on the WWM seems like the easiest, fastest and
>> more than strong enough.
> Which PVA 'grade' are you using,

RSC15 40lb bag $171.47 for slabs - this is what we use the most
REC100  33lb bag $157.36 for sprayer - we did some of this on  
experiments

>  how are you applying it (spray or not), and

We have only done a small amount of spraying using a Tirolessa. I  
found I was just as fast and neater by hand. That was with the REC100.

Mostly we use the RSC15. Pour for slabs, hand apply for walls,  
mortar, parge, roof barrel vault, etc.

> what is your [average/target] shell thickness?

The roof is 1.5" thick. We did it in two coats. The first was about  
1/2" thick to stiffen it. Then we did another 1" to get a unified  
layer. We still need to do the insulating layer on the cottage roof  
and then the final hard coat. That is a project for this summer.

Here's a link to a model, a dog house, which did all the layers  
including a insulating concrete layer over the roof and then another  
hard coat. We build lots of models to experiment.

http://sugarmtnfarm.com/blog/2007/09/dog-house-bottles-roof.html

There are quite a few photos on my blog doing the actual roof. This  
search gives links to a bunch of those pages:

http://www.google.com/search?&q=site%3Asugarmtnfarm.com+roof

Cheers,

Walter Jeffries
Sugar Mountain Farm LLC
Orange, Vermont
Pastured Pigs & Sheep
http://SugarMtnFarm.com/blog
http://HollyGraphicArt.com
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