We recently worked on an almost identical project. First removed all old caulk. Next sprayed the steps with D2 Biological solution and then waited a few days for the solution to kill the biological coating. Next cleaned with a neutral stone cleaner using Malish brush on a side by side. Next replaced the old caulk with backer rod and exterior grade caulk. Finally sealed with Aldon SBS Sealer.
B

Before

After

________________________________________
From the desk of
Baird Standish
Managing Partner
Facility Specialists, LLC
15 West Highland Ave. Suite E
Philadelphia, PA 19118
Phone: 215-732-7505
Fax: 215-546-9160
www.facspecs.com

> On Oct 18, 2017, at 2:09 PM, Mike Alston <realmikealston@gmail.com> wrote:
>
> Good afternoon, historical society has granite steps that are in need of repairs and cleaning. Any ideals on how to approach this would be much appreciated.
>
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