A gutter system is professionally installed to be strong, functional, and efficient. Sectional gutters are joined together and then sealed into place with caulk. However, the seams of aluminum gutters, even ones constructed from high-grade metal, can become compromised over time. Caulk is a home maintenance necessity and an important part of gutter maintenance.
Reasons to Apply Caulk
There are several benefits to applying caulk as part of your regular gutter maintenance.
Prevention: Applying sealant helps prevent leaks in joints and seams that can become worn or damaged by the elements. Water escaping from these places travels down siding or gets trapped in areas not exposed to the drying effects of sun or air.
Lifespan: Caulking helps prolong the lifespan of gutters by preventing leaks, and stopping rust or corrosion, and reducing the buildup of moisture that encourages mold or mildew.
Functionality: A fresh application of sealant can increase functionality by guiding runoff through the gutter system more efficiently.
When to Use Caulk
If you see water leaking from the joints or seams caulking them can address the issue.
Doing regular gutter maintenance or including it on your annual home maintenance list can help prevent small gaps from becoming larger or leaks from occurring.
When there are visible gaps between the fascia (where a gutter system is connected to the house) and the gutters, apply caulk to stop water from getting in behind the gutter channel.
At the time new gutters are installed or gutter sections are replaced or being repaired, caulking ensures the gutter system remains watertight.
To Repair Gaps
Use the right caulk: The words “sealant” and “caulk” are often used interchangeably for the product used to fill in gaps. A gutter system is subjected to lots of moisture. To repair gaps in gutters, select a silicone sealant over an acrylic caulk since silicone is water-resistant.
In not out: Caulk inside the gutters – not on the outside. When the gutter channel is free of debris, there should be enough room to work on the seam or joint with a caulking gun and any other tools required for scraping away old caulking.
Clean the area: Remove any old sealant. Clean the area thoroughly of any dirt, grime, and sealant residue. Give the area time to dry before applying new caulk.
Apply evenly: Apply a bead of caulk to the seam, joint, or hole with a caulking gun. Spread it across the area with your finger. To ensure that it fills in the gap evenly, spray a mist of rubbing alcohol on the bead.
Let it dry: Allow the caulk to cure as per the product’s instructions. Typically the curing process take 24 hours before the sealant can safely be exposed to moisture.
Test the repair: After the caulk has had time to cure run water through the gutters by placing the nozzle of the garden hose into the channel. Stand directly underneath the repair and see if it leaks.
When to Avoid Caulking
Caulking is most effective when used to fill gaps such as separated seams, pinholes due to corrosion, and holes caused by oxidation (rust). Situations to avoid caulking include:
- Significant damage – too many holes to repair
- Improper installation – caulking will not solve issues related to insufficient gutter slope or not enough fasteners to hold the gutter system in place
- Layering – applying new sealant on top of old caulking can lead to uneven curing, poor adhesion, or mold growth
Leaky or broken gutters can be hazardous to your home exterior. Fixing gutters with the appropriate sealant can be a cost-effective way to keep your gutter system functioning effectively.
