Eliminate ventilation duct leaks with these steps 2026

Eliminate leaks in ventilation ducts with these steps. Before winter arrives, it is essential to check certain sectors of our home and see how prepared they are to receive the cold and rain. Although many times we don't know where to start, here we leave a small guide that will help solve the most common problems faced at this time.

Materials to use:

• Topex leak stopper tape
• Polyurethane sealant
• Butyl capping machines
• Butyl capping pots 1/4 gallon

Tools to use:

• Spatula
• Caulker Gun
• Special Caulking Gun

1 Locate the leak

• To find the origin of the leak, you must follow its path. One of the simplest methods is to observe the roof when it starts to rain. Or, with a hose, simulate the effect of rain and pour water on the roof.

2 repair the leak

• In general, leaks are caused by leaks in the ventilation ducts. It is important that these tubes remain, as far as possible, on the wave or mount of the corrugated sheet and sealed with the correct product.
• Once the leak is located, there are several products that can be used to repair it. For example, for metal roofs, a polyurethane sealant is recommended that is applied with a special caulking gun.
• Butyl drip caps are suitable for all types of roofs, and are applied with a caulking gun or spatula.

• An excellent alternative for covering leaks and sealing ducts are leak stop tapes, which have an adhesive on one side that attaches to all types of roofs.
• In case of sealing a duct, you must cut a square with the surface to be covered and draw the circle of the duct in the center.
• Then, make a cross cut and pass through the duct from the cap to the ceiling.

• Remove the plastic that comes with the black part and adhere to the ceiling, finally incorporate a strip of tape at the junction of the ceiling and the tube.

• It is very important to clean the surface well before applying any sealing product, it is even advisable to use a steel brush.

3 leaks in the plate fixings

• If the leak is due to a fixing, it is recommended to remove it and replace it with a new one.
• In the case of a corrugated fiber cement roof, the fixings are always installed with ridges designed for the peak of the roof, and they are always located at the top of the waves

• The fixings, which are J hooks or galvanized screw must be removed with screwdriver and then replaced.
• New screws or J hooks should have a concave grommet and a PVC seal. In this way it automatically seals and prevents water from leaking.

• Zinc sheets have fixings of helical nails or 2" ½ long screws. As with fiber cement sheets, the loose fixation must be removed and replaced with a new one.
• Of course, in zinc sheets you have to remove the screw or nail with a hammer, using the ears of the hammer to lever the fixation.

• If the leak is in a tile roof, it is advisable to replace the entire piece. To do this, with the help of a devil, remove the four nails and install the new one.
• It must be taken into account that the fixings on the tiles are one on each side and one in each slot.

I leave you the pdf file of the project and a reference video:

https://www.hagaloustedmismo.cl/files/pdf/proyectos/te-tu01_como%20eliminar%20goteras%20en%20ductos%20de%20ventilacion.pdf

That's all! Greetings to all!

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