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 MyMason's Case Studies

 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

 
 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

 
 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

    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

    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
 

 

    Case Study: Chimney Cap as per Building Code

 
        Before and After

   

 
Chimney cap replacement

The Assignment:
    Remove the old metal cap,
    Create a new, peaked and sloped, concrete cap.
    Re-install Storm Collar on Vent.

The Underlying Problem:
    The metal chimney cap sagged in the middle.
    Let water in. There was no internal support.

 

Before
You can see the discolouration where water pooled.
The metal cap had another metal cap underneath, both sagged.

 
The Chimney Cap Removed.
Here, neatly removed with the storm collar, is the cap now on the roof.

 
Another Cap Underneath
This cap will be left in place to serve as a bond-break,
so the new concrete cap does not adhere to the bricks.
A bond-break helps the cap and bricks last longer,
as they have different rates of expansion and contraction.
This metal layer is now required in the Building Code.

 
A Form for the Concrete
You can see the wood form that will hold the concrete.
Red tape around the edge protects the rope forming the drip edge.
Concrete is now being added, like the water, it too sags.

 

Bond-Break, Reinforcement
The white, fire-proof, ceramic wool, surrounds the vent.
This serves as a bond break, as required in the Code.
The epoxy-coated rebar reinforces the concrete cap,
also required in the Building Code.

The Cap Begins to Cure
The 900 lbs of concrete, sloped to the edges,
begins to cure..

Next Steps
After 3 days of curing, we now make the next steps
We trim the excess ceramic wool, and cover it with
high-temperature sealant to keep water out.
Storm Collar Installed
The conical storm collar protects the vent pipe.
High-temperature sealant is used to bond it to the vent pipe.
Done
The custom cap overhangs the sides by 3 inches.
The Building Code requires only 2 inches.

The sloped cap is at least 3 inches thick, more in the middle.

The chimney cap has two bond breaks: below versus the bricks, and centrally versus the vent pipe.

With the epoxy-coated rebar and sloped shape it should last a very long time.

The extra-large overhang and the drip edges will help the bricks last long too.

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This page last modified: August 2014