Why Is Water Running Behind My Gutters?

If you've ever stood outside during a rainstorm and noticed water pouring behind your gutters instead of into them, it's a problem worth paying attention to. Many homeowners assume the gutters simply need cleaning, and while that's sometimes true, there are several other causes that can allow water to bypass the gutter system completely.

Throughout Edmonton, Sherwood Park, St. Albert, Spruce Grove, Leduc, Beaumont, and Fort Saskatchewan, we regularly inspect homes where water has been running behind the gutters for months or even years before the homeowner realizes what's happening. The damage often starts small, but over time it can lead to costly repairs.

Clogged Gutters Are Often the First Thing to Check

The most common cause of water running behind gutters is a blockage inside the system.

When leaves, twigs, roofing granules, and other debris accumulate, water can't move through the gutter properly. During heavier rainfall, the gutter fills faster than it can drain. Instead of flowing toward the downspouts, water begins spilling over.

Depending on the shape of the overflow and the wind conditions, some of that water can wrap behind the gutter and run directly against the fascia board.

We see this frequently in mature Edmonton neighbourhoods where large trees contribute significant amounts of debris throughout the year.

Your Gutters May Be Pulling Away From the House

Even a small gap between the gutter and the fascia can create problems.

As gutters age, fasteners can loosen and sections may gradually separate from the home. Once that happens, rainwater no longer drops neatly into the gutter. Instead, some of it slips into the gap and runs down the back side.

One homeowner in Sherwood Park called us because they noticed water stains on the exterior wall beneath their gutters. During inspection, we found several sections that had pulled away from the fascia just enough to allow water behind the system during every rainstorm.

The issue wasn't obvious from the ground, but it had already started causing moisture damage.

A Missing or Improper Drip Edge Can Cause Problems

This is one of the most overlooked causes of water running behind gutters.

The drip edge is a piece of metal flashing installed along the roof edge. Its job is to guide water from the roof into the gutter.

If the drip edge is missing, improperly installed, or damaged, water can follow the underside of the roofing material instead of dropping into the gutter. This is known as water adhesion or surface tension.

Rather than falling where it should, the water clings to the roof edge and runs behind the gutter system.

We've found this issue on homes throughout St. Albert, particularly on older properties where roofing systems have been replaced but flashing details weren't updated properly.

Sagging Gutters Create Low Spots

Gutters are designed with a slight slope so water naturally flows toward the downspouts.

When sections begin sagging, water collects in low spots instead of draining efficiently. During heavy rainfall, these areas can overflow and direct water where it doesn't belong.

Alberta winters are especially hard on gutters because snow and ice add significant weight to the system. Over time, this can distort sections of eavestrough and affect their ability to drain properly.

We recently repaired a home in Fort Saskatchewan where years of snow loading had gradually created several low points in the gutter system. The homeowner thought they had a roof leak when the real issue was water repeatedly overflowing behind the gutters.

Heavy Rain Can Expose Existing Weaknesses

Many homeowners only notice water running behind their gutters during major storms.

That's because smaller rainfall events may not produce enough water to expose underlying issues. A partially clogged gutter, slight sag, or minor separation from the fascia may go unnoticed for months.

Then a heavy summer thunderstorm moves through Edmonton or Beaumont and suddenly water is pouring down the side of the house.

The storm didn't create the problem. It simply revealed a weakness that was already there.

The Damage Often Happens Out of Sight

One reason this issue can become expensive is that much of the damage occurs where homeowners can't easily see it.

When water consistently runs behind a gutter, it often soaks the fascia board first. Over time, moisture can spread into soffits, siding, insulation, and other building materials.

By the time visible signs appear, such as peeling paint, staining, mould, or soft wood, the problem may have been developing for years.

In Leduc, we recently replaced several sections of fascia that looked perfectly fine from ground level but had significant rot hidden behind the gutter system.

A Local Edmonton Case Study

One homeowner in west Edmonton contacted us after noticing water dripping from behind their gutters every time it rained.

They initially assumed the gutters needed cleaning. While there was some debris present, the bigger issue was a combination of loose fasteners and a missing section of drip edge flashing.

As water flowed off the roof, much of it was bypassing the gutter entirely and running directly behind the system. The moisture had already begun affecting portions of the fascia board.

After installing proper flashing, securing the gutter, and cleaning the system, the drainage problem was completely resolved.

Don't Ignore Water Behind Your Gutters

Your gutters are designed to protect your home by controlling where water goes. If water is running behind them, the system is no longer doing its job properly.

Whether the cause is debris, sagging sections, missing flashing, loose fasteners, or drainage problems, addressing the issue early can prevent much larger repairs later.

If you've noticed water dripping behind your gutters, overflowing near the roofline, or signs of moisture damage around your fascia and soffits, it's worth having the system inspected.

At Catch It All, we help homeowners throughout Edmonton, Sherwood Park, St. Albert, Spruce Grove, Leduc, Beaumont, and Fort Saskatchewan diagnose and repair gutter issues before they turn into expensive water damage. Contact us today for a free quote and professional gutter inspection.