Seal the chimney: This will get you back the vent

One of the most sensitive places on a roof is the breakthrough of the chimney. If the edges are leaking, water can penetrate and cause great damage to the masonry. Thorough sealing is very important in new construction as well as recurring.

Regulations also in the interior

For the first sealing of a chimney, the roof around the chimney must be covered. Usually, aprons made of aluminum alloy or zinc sheet are mounted around the chimney. The aprons are fastened with sealing paste or by soldering.

So that the roof around the chimney does not leak, above all every kind of backwater must be avoided. Even small dents and bends can lead to it. When using rivets for attachment can create a weak spot in the supposedly insignificant hollows. Overlaps of the sheets must always be aligned in the direction of water.

Seal the chimney in eight steps

  • Aluminum or zinc sheet
  • Stainless steel screws or rivets for wood and dowels
  • wall plugs
  • Sealant or solder
  • shears
  • Drill with drill
  • Screwdrivers or riveting pliers
  • Silicone gun or soldering iron

1. Take note of the weather

Working on the roof is naturally very dangerous. Absolutely pay attention to a calm and dry weather. In case of a change in the weather, stop work immediately.

2. Secure

A fixed roof or platform must be present. In addition, a cable holder should be installed. Well suited are outdoor climbing protection.

3. Prepare materials and material

Prior to starting work, position all necessary utensils ready for use or have them handed over by a similarly secure assistant.

4. Drill holes

Drill mounting holes in chimney outer wall. Mark fixing points on rafters on sheet metal and pre-drill.

5. Mount sheet metal aprons

Screw the first cut metal apron on the underside of the chimney to the eaves.

6. Seal the upper edge

Seal the metal edge to the chimney wall or cladding with silicone.

7. Fasten additional sheets

Mount the side panels overlapping the lower panel. Seal top edges. Seal aluminum with silicone under the overlap, solder zinc.

8. collar protection

Incorporate a groove in masonry or facing over the top edges of the sheets. Concrete or glue metal strips into the groove all around.

Sheets and control

The sheets should have at least ten centimeters high thighs upwards. The lower leg must be sized so that it allows the roof tiles or pans to be hung. An additional sealing strip mounted on the plates minimizes the risk that the chimney will leak.

Very important is the regular control of the sealing, especially in spring. Every little defect should be remedied immediately. Silicone must be checked for brittleness and replaced if necessary.

Tips & Tricks

Unlike many craftworks, you can use the motto "Much helps a lot" when sealing your chimney.

Video Board: Sealing a Chimney - DIY - Air Tight removable seal