several things can cause this type of deterioration<div><br></div><div>1. acid rain</div><div>2. deicing salts</div><div>3.sandblasting</div><div>4.improper cleaning chemicals</div><div>5. pressure washing</div><div>6. Just weak limestone that is breaking down due to weathering<br>
<br><div class="gmail_quote">On Tue, May 10, 2011 at 12:21 AM, Roger Konarski <span dir="ltr">&lt;<a target="_top" href="mailto:qm144@yahoo.com">qm144@yahoo.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit"><div>I have a question about the attached picture. What would be causing the banister to spall? </div>
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<div>Thanks,</div>
<div>RK</div></td></tr></tbody></table><hr>
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</blockquote></div><br><br clear="all"><br>-- <br>Frederick M. Hueston PhD<br><a target="_top" href="http://www.stoneforensics.com" target="_blank">www.stoneforensics.com</a><br><a target="_top" href="http://www.stoneandtilepros.com" target="_blank">www.stoneandtilepros.com</a><br>
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