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 MyMason's Case Studies

 Fireplace Case Studies

    Nakkertok Fireplace Surrounds

    Fireplace Surround - Old Wood to New Wood Insert

    Fireplace Surround - Old Wood to New Wood Insert

    Fireplace Fire Brick Replacement

    Fireplace Surround - Natural Stone

    Electric, Natural Stone Fireplace

    Fireplace Hearth Replacement

    Stone Fireplace

    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

 
 Chimneys and Brickwork Case Studies

    Chimney Repair

    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 Pillar

    Brick Garage Pillar Repair

    Window's Lintel Installation

    Brick Sill Creates Wall Damage

    Brick-to-Stone Window Sill Replacement

    Brick Retaining Wall Rebuild

 
 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

    Stone Replacement

    New Interlocking Stone Walkway

    Re-setting Interlocking Walkway

    Tile Installation

 
 Algonquin College/MyMason Case Studies

    Cold Weather Masonry Rules

    3 New Cases Studies in 2015

    Salt and Concrete Testing

    Concrete Curing Stress Tests

    Concrete and Rebar Stress Tests

 
 Parging Case Studies

    Parging, Cement Board

    Parging Examples & Techniques

 
 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

    Concrete Countertop

 

 

 

    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

The Assignment:
    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.

 
 

                Window Parging

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.

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This page last modified: June 21 2009