How to repair joints or cracks in plastic gutters

Many times, the joints of the ducts that form a plastic gutter can separate or crack due to different factors, such as the expansion and contraction of the material, strong winds, earthquakes, blows, improper installation, etc., thus becoming points of water leaks or leaks that can affect other parts of the home and require prompt repair.

This fact makes it necessary to carefully review the state of these structures, especially before the arrival of the rainy season, being first necessary to do a good cleaning of the gutters, not only to have a better view of the joints and detect their possible separations or breaks but also so that there are no traces of dirt that make it difficult to fix and seal the materials.

If water had to be applied or a damp cloth used to loosen dirt or dust adhering to the plastic, it should be allowed to dry before proceeding to the caulking job.

Once the cracks or gaps in the joints in the plastic gutters have been detected, and they have been cleaned and dried, it can be applied in the same sealant and polyurethane adhesive putty for exteriors as long as the gap to be covered has a width of 5 to 35 millimeters.

In general, this type of putty is marketed readily to be used with an applicator gun through an extrusion process. Next, the tip of the tube nozzle should be cut at a point where a drop large enough to fill the crack is produced, then pierce the seal at the end of the caulk tube using a stiff wire or long nail.

To apply the layer of caulk, the applicator gun should be moved at a moderate pace throughout the gap and with continuous slight pressure on the trigger, taking care not to create air bubbles. If you want to do a cleaner job, you can mark the joint with masking tape, which must be removed before the sealant begins to polymerize.

Then, using a wooden stick, a plastic spoon, a small spatula, or ultimately a moistened finger, proceed to smooth the bead of putty.

The same operation must be repeated in all those joints and seams of the plastic gutters in which divisions have been detected, letting the putty dry for the time recommended by the product manufacturer.

Repair of joints or seams in plastic gutters: Cleaning of tools and materials

To prevent the tube of adhesive sealant material from becoming clogged and rendered useless by the accumulation and hardening of its residues in the nozzle, the nozzle can be cleaned with detergent and water while it is still fresh.

Once the putty has dried, it can only be removed using mechanical means; The same is true for tools that may have been used to repair the cracks in the plastic gutters.

Bear in mind: Most of the polyurethane sealant putties need to be applied in environments where a certain temperature range predominates (generally from 5ºC to 30ºC) because the viscosity and sealing capacity of the material can be affected by heat or extreme cold at the time of use.


If you are in Dublin and need help, contact Gutter Repair Dublin to solve your gutters problems.