Proper Surface Preparation can result in not only the cleaning of a
surface but also in giving it a desired architectural effect that can be
seen as well as felt.
As shown below, making use of the physical properties of Sodium
Bicarbonate, Magnesium sulfate, Corncob and Corn Cob Blastings can result
in time and cost savings to the construction industry. In this case corn cob
blasting was chosen over magnesium sulfate due to the the less aggressive
surface cut and also the fact that cob is an inert, non-chemical media
similar to sawdust.
Note: Click on each thumbnail of a picture to
"ENLARGE" it for
Church of the Resurrection
Architect: Diloreto Architects, LLC
Contractor: J. E. Dunn
This 14,000 square foot, one story building uses six different textures,
looks and colors of concrete, stucco, wood and metal.
(click on each picture to enlarge it)
The pictures above show the work in progress with before/after surfaces. We are using corncob and corn cob blastings
at high pressure and high volume to
clean and remove concrete surface imperfections. At the same time the cob opened the pores in the concrete surface for a more visual architectural
There were several major plus' here for the contractor.
- The blasting could be done while other sub-contractors' crews still completed their
scheduled work on time
without shutting down the entire jobsite!
- The concrete cleaning and texturing was able to be done as the
building was raised and closed in.
- The sensitive finish on the immediately adjacent wood ceiling,
beams and on the tender anodized aluminum
window frames and glass were not harmed by the cob blasting of the
The resulting textures are shown above. They are not
color-corrected. You will also note that we "saved" the plaster on the
45°chamfered edge on each column.
- BONUS! In fact, the cob blastings were then used at a lower air pressure
the exposed wood by removing footprints, mildew, water stains, attachment
bolt rust stains, etc from the viewable surface of the open
beams and roof surfaces. This eliminated time consuming hand-sanding.