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Dubbing of an old chimney duct in plastered bricks

An old decommissioned chimney duct will gain to be doubled to allow to integrate it in the future decoration of the room concerned. Commonly used for the realization of thin walls, plaster brick is the ideal material for this kind of doubling. Be careful never to re-use this kind of duct, which once doubled may appear in good condition!

Necessary material

  • Pencil
  • square
  • Level
  • Trowel
  • Mason's decheller
  • Rule
  • Float
  • Plumb-line

Steps

  1. Ground tracing
  2. Laying bricks

Ground tracing

Draw the location of the partition

Draw the location of the partition

1. Mark the location of the partition on the ground. The space between it and the duct is of the order of one to two bricks. Here, use of a Mason square.

Plumb line control

Plumb line control

2. Bastaings placed at the corners between the floor and the joists, will give cohesion to the whole during the drying of the mortar. Check their verticality with the plumb bob.

Spread the mortar

Spread the mortar

3. Spread a bed of mortar trowel at the floor location of the lining wall.

Laying bricks

Put the first row

Put the first row

4. Place the first row by lightly tapping the bricks with the trowel. The corner bricks rest on the bastaings.

Align the bricks

Align the bricks

5. Use a wooden ruler as a guide, to properly align the bricks. Correct them and tamp them by tapping lightly with the trowel.

Offset joints

Offset joints

6. The offset of the vertical joints does not need to be important here it corresponds to a thickness of brick and results from the arrangement of the corner bricks. Place a bead of mortar on top of the bricks from row to row. By overflowing to the duct, it will ensure a perfect connection between the latter and the partition.

Cut a brick

Cut a brick

7. To cut a brick, you will use a bricklayer's decenter. Make a series of cuts to make a sharp break.

Check the alignment of the bricks

Check the alignment of the bricks

8. Introduce bricks in this way. It is indeed essential to have an entire brick at the corner. Coat the vertical edge of the brick with mortar. Periodically check the alignment of the bricks with a ruler, guiding you to the vertical bastaings.

Burr the mortar

Burr the mortar

9. Burr the top mortar with a trowel.

Trace the notches

Trace the notches

10. The presence of joists requires notches in the bricks. Trace them on the spot this way...

Run the notches

Run the notches

11. Execute the notches preferably using the masonry decenter used to cut the end bricks.

Place the slotted brick

Place the slotted brick

12. Put the slotted brick in place, bonding it with mortar, using a trowel.

(photos / visuals: © Diy-prod, except special mention)

On the same topic

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