[TheForge] interesting project

Tue May 20 19:26:00 2003

Tell me more about soda blasting.  Where do you get soda in large quantities
?  Can you use a sand blaster  or does it requier  something different.
Been doing quite a bit of sand blasting latley would sure like to get away
from that silica sand.
Randy Mundt
----- Original Message -----
From: "Paul Hewitt" <[email protected]>
To: <[email protected]>
Sent: Tuesday, May 20, 2003 12:21 AM
Subject: Re: [TheForge] interesting project


> Actually this is quite simple....
>
> Baking soda will solve all of your problems.  Find someone who does baking
> soda blasting like me, and it can be done wet or dry, it will remove the
tar
> form all surfaces.   It will also remove any other contaminates without
> etching or damaging them....paints etc.  I do it all the time, we can ever
> remove graffiti, from soft sandstone brick surfaces with no damage.  It
will
> not hurt the copper but may give it a nice shine which can be etched with
> ammonia to restore the "patina" look.
>
> Baking soda can be swept up, broomed up then washed down with a hose and
its
> gone end of story, also its 100% EPA and DEQ legal.........
>
>
>
> You can email me directly @ [email protected]
>
> Paul Hewitt
>
> H&H Custom Solutions
>
>
>
> ----- Original Message -----
> From: "terry l. ridder" <[email protected]>
> To: <[email protected]>
> Sent: Monday, May 19, 2003 11:08 PM
> Subject: [TheForge] interesting project
>
>
> > hello;
> >
> > a couple weeks ago i received a call from a person who asked me if i
> > would look at a problem with a house that was being restored and he felt
> > that i would either know how or know of someone who would be able to do
> > the work. yesterday, monday, i took a break from the seemingly
> > neverending legal nightmares i went and looked at the house and the
> > problem. interesting project, solution may not be that easy.
> >
> > the house is a historic house in dekalb, illinois. the house was built
> > in the late 1800s or early 1900s. it is an eggshell colored terra cotta
> > brick and stone mansion. the main roof the part copper and part tile.
> > the main roof is fine. the problem is the single story, flat roof,
> > "breakfast" porch. someone in the last century tarred the roof. they
> > were not to careful as to where the tar oversprayed. roughly fifty feet
> > of copper sheet roofing to partial covered with tar. approximately 35
> > square feet of stone work and brick work is either covered with tar or
> > has severe overspray.
> >
> > given the age and composition of the brick and stone work acid or base
> > cleaning is out of the question. in researching several restoration
> > sites on the web which especially deal with stone and/or brick masonary
> > historical building there seem to be few options.
> >
> > copper sheet on roof. there are several reasonable restrictions. attempt
> > to preserve the original copper patina if at all possible. if not
> > possible propose a way to artifically recreate the patina to match the
> > original existing copper patina elsewhere on the roof. they are aware
> > that once the tar is removed from the copper sheet that the newly
> > exposed copper will need to be artifically aged. the national park
> > service site on restoration of historical sites suggests using liquid
> > nitrogen to freeze the tar and chip it off the metal with plastic or
> > nylon tools. that seems like a reasonable possibility.
> >
> > the masonary ( stone and brick ) is a different problem. the moisture
> > content of the brick and stone would seem to prevent the use of liquid
> > nitrogen. the fear i have would be that will freezing the tar and
> > hydroscopic moisture content of the mansory would also freeze and cause
> > the masonary to crack or spall. abrasive removal is out of the question
> > since the stone work is soft stone. so how to remove the tar from the
> > masonary. again in researching the web several commerical products were
> > suggested. upon reading the msds they all contain dichloromethane
> > (methylene chloride), xylene, and ethyl benzene. dichloromethane and
> > ethyl benzene are listed as carcingens. the safety measures required to
> > work with these chemicals and given the close proximity of neighboring
> > houses really prohibits their use. the hazardous waste disposal would
> > also tend to be cost prohibitive.
> >
> >
> > two web sites listed using kerosene to remove the tar. they suggested
> > soaking heavy paper towels or cotton rags in kerosene and draping them
> > or securing them to the areas and let the kerosene soaked paper towel
> > or cotton rags through capillary action dissolve the tar and soak it
> > into the paper towel or cotton rags. this would appear to be a workable
> > solution. yet another solution was to use an extremely small nozzle on a
> > liquid nitrogen hose and freeze the tar in small sections and remove it
> > a bit at a time.
> >
> > i am interesting in observations, comments, suggestions, etc.
> >
> > btw, this project has to be done by the weekend. there is a party at
> > this house on saturday of roughly 150 people.
> >
> >
> > --
> > Terry L. Ridder ><>
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