You’re going about the right way, these are all great suggestions and all that can work depending of the situation.

- 1rst thing - Do your tests, and get it accepted, from there we can decide which way to go. Without the test, it’s impossible to know if dry/ wet combined – ect

I recently finished 30 foot walls (black marble) and we had to combine the two actually.

Possibilities

- Dry Polishing – great! A lot easier, but dusty. Strategically placed fans will help tremendously.

- Wet Polishing - I like it, especially outside on a summer day, but it can be done quite well too.

To collect your water, place plastic in such a way to create a funnel, in other words, it is taped to the top of you scaffold and to the bottom of the wall

The slight inclination is just enough to funnel all the water from the top straight to the corner on the bottom of the wall.

Attach it to an eavesthroughs and you can now collect all your water.

Add a running vacuum to one end and no mess, if you use this method I have pictures of our setup of a wall job I can show you for better explanation.

- My preference is a scissor lift, more versatile, more mobile especially if you will be going up and down frequently .

- I also have a need for multiple hand polishers and my choice is still Makita 9227, I also have a few on the shelf, very reliable tool and they set up in such a way that everyone has repair shop on

a corner close to your homes. But if you need a multiples machine there are some polishers available for about 150$ , Variable speed wet, I have four of these as well. Why? How often do you get a job

where you need multiple guys, like wall. I bought the four in Oct 2008 and I have never used them since. I budgeted the total cost to my job, so they were immediately paid for but I dint gouge the customer

with a high wet Makita price. If your one person doing the wall, then maybe consider buying two wet Makita’s and that’s it.

- For the cleaning, I often just use pole extensions and micro fibre pads - a lot easier to do it from the ground. Get poles long enough that you can work at least 4 feet away from the wall, are else you will need a rain coat.

- For the wet jobs, all tools can be modified to not have that awkward garden hose, replace all that nonsense with hoses they use in garden irrigation.

Antonio

Montreal

From: Baird Standish [mailto:bairdstandish@gmail.com]
Sent: August-05-09 10:14 PM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Limestone Entry

Thanks guys

Will check on insurance. Also, I think that there is both water staining in the stone and etching (can feel the grooves made by water damage).

I like the idea of honing dry, but then would be foregoing chemical cleaning ? I have never used screens (except on a wood floor) what would this entail? Here are a few more pix of what the walls look like. the last picture in the group is what the results of my efforts were on one spot along the edge. Still some tiger striping but a smooth finish and a much more even look.

Baird

On Aug 5, 2009, at 9:07 PM, Dr Fred wrote:

This can be a bit tricking and I agree you should try to stay away from any chemical. You may want to try honing dry with screens. If this works it will be a little dusty but you wont have the over spray problem. If you use any thing with water you take the chance of the stone re oxidizing and turning brown again.

On Wed, Aug 5, 2009 at 7:05 PM, Baird Standish <bairdstandish@gmail.com> wrote:

Hi Everyone,
We have a contract to clean and hone the limestone framing around the entry and windows at a church. The Limestone has been damaged by water. What this means and what I see is fine (and not so fine) etching from water, ingained white efflourescence, discoloration of the limestone itself (from iron oxide perhaps?) and general soot. They were unhappy with a "skimcoat" test-painted on - (probably R-97 by Cathedral Stone Products). Also, someone else tested Prosoco 942 and that didn't work either. I tested honing a portion of the wall with 400 grit Twister/velocity pads on a hand-held and using NCL Hurricane natural stone cleaner. It came out looking pretty good and gave it a nice smooth surface. My three questions are:
1. Any other cleaners that I might try? I have some Klenztone Limestone cleaner that might do the trick. I think I want to stay away from acidic solution.
2. We are going to be working up high on heavy duty scaffolding. I want to work out a way that chemicals and water don't spray all over the place and that the solution can be collected in some fashion. The windows will be cleaned professionally after we are done. We will put plastic, paper and tape around.
3. I am pondering getting a variable speed angle grinder with a water feed (maybe the Alpha variable speed polisher), but wondering if it is worth it.
We haven't spent much time working up high on walls. So any suggestions would be great. Thanks,
Baird

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