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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: Wobbly Chimney, Internal Damage

 
        Before and After

   

 
The Assignment:
    The homeowner was selling the house, but...
    The Building Inspector found a problem.
    There was excessive movement, sway, in the chimney.
    An Engineer has devised a solution.
    My job was to take down and rebuild it.
    We would tie into the home's wood joists.

 
Getting Prepared
The chimney was coming down below the roofline.
I set this scaffolding to be very stable
Two days later there were 60 km winds, it was still very stable.

Safely Anchored to the Roof
This bracket connects to a D-Ring holding my rope.
The nail holes are filled with a roofing tar.
This is an approved anchor to use, if none other exists.

 
Cement Bricks, No Holes
The Building Inspector was able to shake the chimney.
One reason was these weakly adhered cement bricks.
Their lack of internal holes provided little adherence.

 

Flues Not Tightly Stacked!
You can see a gap below this flue.
And broken bricks around the gap
Furnace exhaust vapours wetted the exposed brick
Then freezing caused the wet bricks to break, internally.
This is a hidden reason for the chimney's weakness.
More Problems
Below the roof line, hidden from view
Clay bricks were used, without brick ties.
So nothing was holding this chimney to the wall.
And the tar paper didn't go all the way, either.
The loose stack of bricks in the middle, under the chisel, added no strength.
Engineer's Design
These bars were tied into the 2nd floor ceiling joists.
They would be cemented in between rows of bricks to hold the stack against the house.

The homeowner was also an engineer and suggested filling the centre space with concrete, instead of replacing the loose bricks. We removed six more layers of central bricks and filled it with concrete.

Brick Ties
Usually brick ties are spaced up to 18" apart.
And are placed every third row.
In this case we put them on every clay brick.
We got new clay brick with large holes, to help connect one row with the next.

You can see green, epoxy-coated rebar in the central concrete core we're creating for extra strength.

And the tar paper has been fixed, protecting the wood.

Re-Building the Chimney
We've replaced about half the bricks, due to internal damage not visible before the job.
Almost done
Nearly finished, the joints are smooth, the lines are straight.
We've used the S type cement recommended by the engineer.
Done
A metal cap surrounds the one remaining flue with sealant.
It has a snug fit to the chimney and flue, and adhesive underneath.
The roof has been protected with a dropcloth.
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This page last modified: August 2014