MyMason's Case Studies
Chimneys and Brickwork Case Studies
Chimney Repair, Articulated Boom
Custom Scaffold, Chimney Repair
Lower-Chimney's Removal, Wall Restructuring
Chimney Flue Replacement
Concrete Chimney Cap as per Building Code
Chimney - Sloped Side, Repair
Chimney - Wobbly Chimney
Brick Garage Pillar Repair
Window's Lintel Installation
Brick Sill Creates Wall Damage
Brick-to-Stone Window Sill Replacement
Brick Retaining Wall Rebuild
Concrete Case Studies
Broken Concrete Step
Basement Window, Concrete Cut
Basement Window, Concrete cut-out
Concrete Walkway, Landing
Concrete Stairs and Landing
Concrete Stairs and Landing
Stone Work Case Studies
Stone Wall Rebuild
Granite Resurfacing of Concrete Stairs
Stone Step Rebuild
Stone Stair Rebuild - in Winter
Stone replaces Brick Door Sill
Stone Retaining Wall Rebuild
Dry-Stack Retaining Wall Rebuild
Dry-Stack Stone Retaining Wall
Flagstone Patio Rebuild, Expansion
FlagStone Step Repair
New Interlocking Stone Walkway
Re-setting Interlocking Walkway
Algonquin College/MyMason Case Studies
Cold Weather Masonry Rules
Salt and Concrete Testing
Concrete Curing Stress Tests
Concrete and Rebar Stress Tests
Parging Case Studies
Parging, Cement Board
Parging Examples & Techniques
Fireplace Case Studies
Fireplace Surround - Old Wood to New Wood Insert
Fireplace Fire Brick Replacement
Fireplace Surround - Natural Stone
Electric, Natural Stone Fireplace
Fireplace Hearth Replacement
Cultured Stone Fireplace & New Framing
Cultured Stone Fireplace Surround
TV Mounted on Stone Fireplace
Restructuring Fireplace: Wood to Gas
Drywall to Stone Fireplace
3-sided fireplace: Cultured Stone
Fireplace Removal, Damper Removal
Case Study: Parging Techniques, Preparation
Grinding before Parging
If a hard-to-remove substance like paint or tar is on the concrete it has to be addressed before parging. Grinding it off is one method.
A special concrete adhesive, or galvanized wire mesh, are the other means to secure parging to a wall.
Here, you can see the white paint has been ground off.
Patched Before Parging
We fill in the bigger holes in the concrete with a stronger cement (Portland), and then we parge.
Parging, Temperature, Cracking
During the curing of the thin parging layer it may shrink at a different rate in one spot versus another. As your house changes temperature and size throughout the day, nearly every day, even a single wall can have different temperatures along it. If the parging shrinks at a different rate during curing, cracks can form. These are easily remedied with a slurry, and if done soon after will blend in seamlessly.
According to the product expert at one of the major parging cement manufacturers, parging should not be done when the temperature is above 25 degrees, nor when it below 5 degrees. Meaning the available and optimal days for parging are very limited.
Two Parging Tools
A steel trowel to put on the parging, and a fine-celled sponge trowel to do a textured finish, one of the more common styles.
There are more parging tools, with specialty trowels, and other finishing tools.
Stages of Parging Reconstruction
Identify the weak parging,
Remove all weakened parging,
Keep the driveway area clean,
Re-parge the weak areas.
The new owner will paint everything with a Latex.
The Underlying Problem:
The foundation is slowly settling.
Removing the Weak Parging
Some areas are visibly broken, some cracks are visible.
We tap on the parging to listen for hollow areas, where the damage is hidden.
Thick canvas drop sheets gather all the debris.
The pictures reveal the expanding repair area.
Hidden Damage Revealed
Finally done excavation, the drop sheets are removed, the wall washed of dust and re-hydrated.
Parging can begin. The wall must be well saturated before parging, and is optimally misted regularly during the first three days after application.
I use less than the recommended amount of water noted on the bag, as experts agree it makes it stronger and reduces cracks that can form as it cures and shrinks.
While the pre-mix parging cement is more expensive, it contains ingredients to enhance endurance, UV resistance, and adhesion. In some applications a primer is used to increase adhesion.
Curing before Painting
A special parging cement with bonding agents was used for this job.
The parging is drying slowly and therefore more strongly because of repeated waterings during the curing process.
The client painted it afterwards. There are paints for cement, that allow it to breathe.
The Front Entrance - a salty area
Chiselled and cleaned.
Watered multiple times, before and after.
The parging protects the wall from winter salt.
"Perfect" it was called.
A smooth finish, providing cosmetic and protective value.
Colour can be added to the cement before mixing.
Sometimes neglected, window seals often get weather extremes.
The various materials used around a window have different thermal expansion and contraction properties, so the wood/plastic/brick/etc. combination doesn't move as one.
Consider Colour for Garden Elements!
This diving board, surrounded by canvas drop sheets and freshly parged, was a fun shape to do.
It has 90 degree inside and outside corners and rounded corners.
This page last modified: June 21 2009