How To Install Chimney Counter Flashing

First the existing chimney flashing and shingles surrounding the chimney are removed. Make a perpendicular cut at the upper edge of the flashing at each mark so the flashing can be fitted. Problems with Counter Flashing. The grooves should be 1 inch 25 cm deep.

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Install the cap flashing.

How to install chimney counter flashing. Fit the front cap flashing around the front of the chimney. In good quality work the top is bent and set 1 to 112 inches into a mortar joint reglet. The bottom of the flashing is.

Saw as high as the height of the cap flashing. Once the first metal panel is installed the second piece of flashing is set in place. Mark the top edge of the counter flashing at each corner of the chimney with a felt-tip marker.

We call this counter flashing. Bend the cap flashing around the front of the chimney. Start by measuring the width of the chimney.

There are two layers. Bend the flashing horizontally and make sure it follows the roof angle. Remember to follow the line of the step flashing in order for the water to drain away from the chimney properly.

The first one is the base and is at the bottom of the chimney and the second one is inserted into the brickwork of the chimney. Cut and install the base flashing with a pair of tin snips. Installing a Chimney Cricket Many roofs implement the use of a chimney cricket to help with water flow.

Cut an indent into the chimney with a diamond bit sawdiamond grinder disc. Cut and fold the first piece of flashing so it wraps 1 to 2 inches around the front of the chimney. Roofing flashing counter flashing this video is owned by MCR.

Use the grinder to cut a 1 inch deep slot into the mortar joint to install the flashing. Cap flashings should be fastened to the chimney only. Use tin snips to do so.

Cut a piece of galvanized flashing 10 inches longer than the chimney width. Its edges are embedded into the mortar of the chimney and then are bent down over the step flashing and secured to the roof. Finally you will install the counter flashing sealing everything off with caulk to ensure there are no cracks and crevices for leaks.

The base flashing is installed underneath the shingles and bent in an L-shape upward against the brick chimney. In this video I should you guys how we cut into the chimney and install counter flashing. The purpose of the counter flashing is to sit on top of the base flashing to make sure water doesnt go past it and instead flows down the roof or through the gutter.

Pieces of step flashing and shingles are overlapped and interweaved to redirect water away from the chimney and roof. Next cut pieces of step flashing 10 inches square. The front flashing back flashing and side flashing are then installed.

This mortar joint is sealed with mortar and sometimes a flexible caulking. Bend them more than 90 degrees so they will press against the chimney. Then the base flashing is installed around the bottom of your chimney.

Many roofers will surface mount chimney counter flashing by attaching a flat piece of metal to the chimney surface and apply a bead of caulk to the top edge of the flashing. Ensure the chimneys base flashing is in proper order secured to the roof as the manufacturer or mason recommends beneath the shingles. Use a circular saw to saw grooves into the mortar joints.

Counter flashing on a chimney is the second layer of flashing that is applied to make the chimney connection to the roof watertight. Cut 5 inches off the edges of each side of the. This is not the correct way to install counterflashing because when the caulk fails.

To effectively install the counter flashing youll have to remove the mortar joint along the step flashing and create what is called a reglet. Be sure your roofing contractor checks for breaks cracks or holes before moving forward. It is installed over the top of the first layer of flashing which is called step flashing.

If you were not provided with base flashing you can install step flashing up the side of the chimney. The starter strip of the flashing must be positioned at the front of the chimney.

Extra Pict How To Install Chimney Counter Flashing

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