Invest in a Gutter Guard Sealing the gap between the roof and the gutter using silicone caulk and installing a gutter guard will reduce the risk of water damage due to leaks.
One hack to stop leaking guttering is to use a sealant or caulk to fill in any holes or gaps in the gutter. Another option is to use a gutter patch kit, which includes a waterproof tape that can be applied over the leak. Additionally, make sure to clean out any debris or blockages in the gutter to prevent future leaks.
There should be a 5mm gap for expansion and contraction, but in my opinion i think because there is excess water coming from main roof above it could be overflowing or splashing down the back of gutter. Eves gaurds may help but i would redirect the water from the main roof first see if that helps.
Load sealant into caulk gun, then run a generous bead the full length of the gap, about 1-2 inches deep to allow for spreading by tool. Slowly run the smoother tool along bead to spread sealant into a uniform layer without gaps from roof edge to back gutter rim.
Gutters Should Extend Slightly Beyond the Edge of Your Roof Shingles: Three-fourths of the gutter's width should extend past your roof's shingles to catch water and redirect it through the downspouts.
Sealing the gap between the roof and the gutter using silicone caulk and installing a gutter guard will reduce the risk of water damage due to leaks. The caulk will bridge the gap while the gutter guard keeps the channels clear and clog-free. The guard will help the gutters do their job more efficiently.
If the gap between the roof and the gutter is too big, chances are that the water running off your roof is going to miss the gutter entirely. Stick to a fall of 3mm per meter and you'll not go wrong with your gutter installation. When installing your outlet piece, it should be no lower than 50mm (2inch) from the roof.
Apply Caulk: Cut the caulk tube tip at an angle. Load the tube into the caulking gun and then run a continuous bead of caulk along the gap with a steady hand to ensure even application. Smooth the Caulk: Smooth the bead with a caulk-smoothing tool or a wet finger.
3-5 centimeters is in the 2-3 inch range. Any more and you run the risk of water running off the tile and overshooting the gutter. The gap can vary some because the gutters must slope towards the downspout.
Gaps in the guttering
The solution: To fix gaps between the guttering itself, you can install an expansion gap filler between the two affected pipes. As the problem is often caused by temperature changes, make sure to carry out the work when the temperature isn't at an extreme.
The best way to fix a gap between fascia and gutters is to use caulk. Apply a long bead of silicone caulk along the joint where the gutter meets the fascia. Smooth it out with a damp cloth to form a neat seal against moisture and pests.
Gutter sealant, in short, is a liquid or gel used to close up any seams in gaps between parts of a gutter system. Even the most sophisticated gutters need multiple parts to accommodate different roof types, so seams are inevitable.
Gutters are made of a material that isn't affected by water, like aluminum or vinyl. They are attached to the facia board or rafter tails with a bracket that fits into the rim of the gutter. It's screwed to the house or a long screw with a ferrule to help the gutter retain its shape.
The existence of gaps between your gutters and roof is more than just a cosmetic concern; it's a potential threat to your home's structural integrity.
Once the gutter is in the correct position, do this to prevent water from seeping behind the gutter: Load the silicone caulk tube into a caulk gun. Apply a continuous bead of caulk along the joint between the top edge of the gutter and the fascia board.
The drip edge is a metal flashing installed along the edge of the roof to direct water away from the fascia and into the gutters. Over time, the drip edge may become damaged, bent, or improperly installed, leading to water infiltration behind the fascia, which can result in rot, mold, and structural issues.
Incorrect placement can also cause erosion of the soil around your house, infestations of insects in the gutters, and damage to the siding or foundation. And all of these issues are often expensive to fix. It is recommended that gutters are placed under or 'behind' the drip edge of your roof.
A “builder's gap,” intended to help with attic airflow, is caused when roof decking is not flush with the fascia. This can allow pests and water to enter your home and cause various damages. Flashing or a drip edge can be used to seal this gap.
If you find water dripping behind your gutters, it's probably because it was installed without any flashing over the back of the gutter. Adding a gutter apron prevents the dripping. Created from a bent piece of flashing, a gutter apron tucks up under the shingles and over the gutter.
Methods for Diverting Water Runoff
For those without gutters, consider artistic solutions like rain chains. These decorative chains attach to your roof and channel rainwater down each link, creating a visually appealing water feature while effectively directing the flow away from your house.
You can do this by using plywood or shingle along with roofing tar. First, on the inside of your roof, spread the tar into the hole using a putty knife. Then, place the plywood or shingle onto the tar. Spread the tar around the edges of the patch.
How Far Should Gutters Be From the Roof Edge? The gutter should be installed as close to the shingles as possible; no more than 2 or 3 inches. If the gutter distance is more than 3 inches, the rain will run off the roof and won't drain properly.
Silva recommends installing the drip edge so the edge of the roof is 1 1/2 to 1 3/4 inches away from your fascia board. This way, water can drop freely instead of seeping back into the fascia. “It won't drop if it does get blown in there from wind, but it's really not going to be surface tension,” Silva says.
The general rule of thumb is for metal roofing to overhang the gutters by no more than 50mm (approximately 2 inches). Any further will change the look of your home, curb appeal and how the excess water flows from the roof to the gutters during a storm.