When To Replace A Leaking Metal Roof

AWS Roofing has been in business on the Central Coast for almost 20 years, and most homeowners contact us when they have a leaky roof.

We continue to discover new causes of leaky roofs after two decades of replacing them. A roof can leak for a variety of reasons.

metal roofing

First, we’ll look at the eight most common reasons for leaking roofs on Central Coast.

We have been installing roofs and gutters on the Central Coast for many years and have seen it all when it comes to Central Coast roof installations and roofing difficulties, as well as why these lead to roof leaks.

The majority of leaky roofs fall into one of the following categories.

The following are the eight most typical reasons for leaking roofs:

1) Rooflights:

Rusted skylights cause roof leaks.

The natural water tightness of roofs is breached as soon as holes are bored in them to add skylights. Some skylights begin to leak the day they are installed on the roof. This is mainly due to poor skylight selection or improper installation. Clogged louvres are the most common source of skylight leaks later on. Finally, because roof windows have a shorter lifespan than the roof, worn and rusted roof windows will leak and need to be replaced.

2) Cracked Tiles:

Tiles and cracks break, resulting in leaks. Typically, tiles do not break on their own. They break when anything falls on them, such as overhanging tree branches.
There is a possibility of the tiles breaking if people walk on your roof. This is frequently when trades must go to the roof for cleaning/restoration or installing aerials/solar panels.
It is simple to replace a broken tile, and it is inconvenient when a cracked tile is left on the roof when it might have been changed or repaired at the time of damage.

3) Rusted  gutters

A rusted gutter is leaking heavily. While tile roofs do not rust, most roofs have covers, which were previously just galvanised metal covers. Leaves and gutters do not get along. If your gutters are clogged with leaves, an unexpected downpour can cause a dam. Water will run over the gutter’s edge and spray out of the roof.

4) Improper Ridge Covering:

Ridge flashing leaks are pretty standard. Over time, the bedding and grout beneath the tile ridge covering fracture. Water seeps between the cracks and does three things. It can collect behind the bedding in the tile (if it is sealed to the tile) and finally overflow into the roof hollow (this is why drains are so important). It can run along the back of the bed, find a drainage path along the tile, and seep back in – all while causing no harm (the usual case).

Alternatively, it can run around the back of the bed and NOT find a drainage path but rather the tile’s edge. As a result, there is a leak. These leaks are challenging to detect unless the ridge cover is removed first.

5) Fireplaces:

Chimney leaks are common. A chimney is another opening in the roof that must be adequately sealed. Covers around chimneys degrade and frequently leak. Chimney heads fall off.

Most tiled roofs have lead flashings at the top, and the lead eventually cracks. Resealing with silicone sealant is a straightforward solution. The more expensive option would be to replace the covers.
Some chimneys have hidden side covers that might rust.

6) Faulty roof flashings:

Metal roof flashings frequently leak. Covers should be used to seal the margins of the roof. Making intricate flashings that fit perfectly and do not leak requires many roofing skills. If a new roof leaks, the roofer most likely makes an error in sealing the roof. The flashing frequently determines the quality of the roof installation.

Roofs with rust:

Roof leaks are caused by corrosion. This reason may appear to be self-evident. A rusting roof is easily discernible. However, it takes time for the roof to rust, holes to form, and water to pour out. Furthermore, rust areas are frequently localised and disguised. In many circumstances, the rust spots can only be seen by looking attentively at the overlaps and under the gutters.

8) Clogged gutters

Blocking gutters can be disastrous if there are no overflows to operate as a pressure release valve system.

The gutter overflow is most likely clogged if your house floods and you have gutters.

The quick answer is straightforward: simply remove the obstruction.

Long-term protection requires a system that prevents obstruction and protects against overflow.

Standard gutters are frequently clogged with leaves, resulting in a lovely gutter garden and overflowing gutters. They rarely cause problems with leaks in the home. The only exception is when the gutter hangs over the windows. The overflowing water then flows through the eaves and onto the window head, causing water to flood into the window.

The most common reasons why roofs leak only when it rains a lot are:


Overflowing gutters.

Because leaves and gutters don’t get along, frequent gutter cleaning can help prevent this.

During prolonged dry seasons, leaves (and possibly other debris) build up in gutters. Downhill slopes further aid leaf buildup. The storm then arrives, bringing heavy rain. The water runs down the valley and collides with the trash buildup.

Although some water may seep through the rocks, the heavy onslaught pulls the boulders closer together, causing the water to pour over the valley’s edge and into your house.

Spreader for downspouts.

Upper gutters on two-story roofs typically drain to lower roofs via downspouts.

The tiles are designed to drain rainwater up to a particular rainfall intensity if it falls directly on the tile and the roof has a certain length. Although basement roofs are typically short, a downspout can drain more than 10 times the tile’s intended load-bearing capability.

Water flows become porous, and water runs off the slab’s top edge in the case of concrete slabs.

Watercourses that are polluted or faulty.

If the roof is wooded, leaves will wash into the watercourses, eventually obstructing after heavy rains. The resultant excess causes leaks.

Corrugated metal roofs with a low pitch.

Standard corrugated roofing is intended to be fitted on flat roofs. On the other hand, roofing membrane producers require a minimum slope of 5 degrees. As a result, constructing a corrugated roof with a pitch of fewer than 5 degrees (which is rather typical) will result in overflow in heavy rain.

When extra water fills the grooves and spills under the overlaps, the overlaps of the roofing sheets will flood. Overlap bolt holes will also leak.

The wind might blow water over the ends even when the corrugated roofing sheets are turned upwards. A valley draining onto a flat metal roof combined with insufficient transition sheets results in a roof leak that many builders and roofers find challenging to discover and repair.

Yields are insufficient.

To prevent overflow, the upstream ends of ALL roofing sheets must be “rolled over.” Flooding can occur during heavy rains if precautions are not taken appropriately.

When heavy rain, leaves, and wind combine to generate an overflowing pond, some Central Coast roofers lack the tools to flip low-slope roofing membranes, and the “dike” becomes ineffective.


During severe rains, spilling debris blocks low slope valleys or valleys. As a result, “Kliplok” flat roof valleys must be uniquely constructed to ensure enough water retention capacity. Otherwise, they will overflow.

Other roof parts can only leak when it rains heavily

Gutter boxes

If you have a box gutter, it should be cleaned regularly and equipped with an overflow device. Otherwise, an avalanche of water will unexpectedly enter your living spaces during severe rains.

Downpipes are used to drain water from most box gutters. As a result, it is critical that the downpipe holes are not obstructed. Some install mesh coverings over downspout apertures clogged with debris after heavy rain.

Guttering on the outside.

Water will not usually enter the house if you have good guttering (even if the gutter overflows). However, if you don’t have deep eaves or gutters, excessive rain will cause the perimeter gutter to overflow and run into the wall cavity. It then enters the house in several “interesting” areas.


The majority of gutter cleaners do not clean around skylights. As a result, the skylight base is the most minor well-maintained component of a roof. When leaves gather between the roof and the sides of the skylight over time, a dam forms unexpectedly after heavy rains. The water bursts over the support’s outside edge and onto the roof below in a fine spray.

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