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We have no pictures so your going to get about a dozen different reply's.
Never once used sand paper on masonry.
Pressure washer or wire bush. How old is the house?
Been tested for lead paint?
 

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I'm knocking off the seams on the inside of my poured foundation to make it smoother for adding rigid insulation. I'm using a 4" diamond cup and it takes it off like butter. A standard grinding wheel would do as well and being a little slower would mean I wouldn't have to be as careful.

My point is, sanding would not work for me. If you are smoothing a rough surface as opposed to removing any amount of cement than consider a grinder. If you are removing paint from the masonry the sanding would only remove the paint on the high spots and not in the crevices.

Pictures would help.

Bud
 

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Discussion Starter · #5 ·
Should I do the following steps?

1. Pressure wash to knock off loose paint
2. Feather sand wood and wire brush masonry
3. Clean with TSP

Or, should I flip 1 and 2

Here are some pics after scraping:






Under Roof Deck:

 
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