How to Seal Gutter Joints: A Step-by-Step Waterproofing Guide
Why Seal Gutter Joints
A leaking gutter joint is not something that you want to ignore and can cause further problems if left untreated. The constant flow of water through the gutter can mean that the leak point is enabling a persistent stream of water onto your walls and foundations which can lead to major structural issues, mould growth and unsightly green and black marks on the outside of your walls.
There are a few different causes for leaking gutter joints ranging from poor installation to weather conditions. Here are some of the most common reasons your gutter joint may be leaking:
- Debris in the seal
Temperature fluctuation can not only cause weakness in the gutter fittings but cold weather changes can lead to contraction, which will allow dirt and grit to enter the system, preventing the seal from functioning correctly once it has heated and expanded again.
- Wear and tear
Similar to any other joints in and around your home, gutter joints are subjected to wear and tear, especially in areas of particularly harsh weather conditions. You should look to replace any joints, fittings and length that have worn away.
- Temperature fluctuations causing weakness
Gutter components expand and contract in hot and cold temperatures. On the inside of the gutter fitting, there are insertion marks that take into consideration the sizes of the gutter when hot and cold. If the gutter component has been cut to the wrong size or not fitted correctly, temperature fluctuation can weaken the seal as the joint rubs against it, causing wear and tear and potentially creating a gap in the joint.
- Poorly installed/damaged gutter fittings
It’s important that if you see any damaged lengths or fittings in your gutter that you replace and repair them as soon as possible, to prevent worsening leaks. You may also want to ensure that your guttering is properly installed, in that the screws and fascia brackets are securely placed as ill-fitting fixing may cause sections to sag, weakening the structure of the gutter system.
Step-by-Step Guide to Sealing Gutter Joints
You can use a roof and gutter seal to repair leaks in metal and plastic guttering. Before applying the sealant ensure to wear gloves and goggles to protect yourself.
- You should first begin by cleaning in and around the area where you will apply the sealant. If there is any rust or loose paint visible, you should use a wire bristled brush to effectively remove.
- Using a scraper, remove any old and existing sealant / jointing material that may inhibit the adhesion of the new sealant.
- Place the nozzle of the sealant gun into the joint, and run a bead of roof and gutter sealant around the pipe/gutter area, ensuring you have filled the gap properly.
- Smooth the sealant with a sealant smoothing tool or your finger to leave a neat finish.
Common Mistakes to Avoid When Sealing Gutter Joints
It is important when sealing gutter joints that you select appropriate and high quality materials, you should take into consideration the weather conditions in your area which should suggest if you require a more water/corrosive resistant formula. Making sure to apply the sealant properly is also essential, as it is important to ensure the joints sealed are as watertight as possible.
Benefits of Regularly Sealing Gutter Joints
It is important to properly seal any gutter joints to stop the ingress of water into any cracks or damaged areas, which will preserve the structural integrity of your gutter system and prevent any water damage.
Frequently Asked Questions about Gutter Joint Sealing
How can I remove old gutter sealant?
Similarly to how you would remove any other types of sealant, you can use a sealant remover/mineral spirits, applying a small amount to the surface and then taking a scraper to remove.
Can I apply gutter sealant to a wet surface?
It is generally recommended that you apply your sealant to a dry surface however, some polyurethane sealants can be applied to wet gutters.