Gutter repair and replacement across Parramatta

Gutters are the part of a roof that gets ignored until the day they decide the matter themselves. In Parramatta they decide it fairly often, because this is a flat catchment with the Parramatta River running through the middle of it, under a storm pattern that drops a lot of water in a very short time.

Call (02) 9090 4741 if water is going somewhere it should not.

Box gutters first, because they cause the most damage

The old core of Parramatta — North Parramatta, Harris Park, Rosehill, Granville — is full of Federation and inter-war houses that have had a room, a kitchen or a whole wing added across the back at some point in the last century. Where the new roof meets the old, there is very often an internal box gutter.

A box gutter is a channel that sits inside the roof line and carries water to a sump and a downpipe. It works, right up until it does not, and the failure mode is severe: the water has nowhere to go sideways, so it goes over the internal lip and into the ceiling cavity. People describe this as a leak. It is really a flood in a channel.

What goes wrong with them

• Too narrow. Current practice under AS/NZS 3500.3 sets a minimum sole width of 200 mm for a house. Plenty of older gutters are narrower, and a 200 mm sole cannot carry flows much above about 10.5 litres per second regardless.
• No freeboard. The sizing allows roughly 30 mm of freeboard so wind cannot push the flow over the side. Gutters built tight to the capacity have none.
• No overflow. This is the big one. A box gutter needs an independent overflow that discharges to open air — a side overflow at the sump or a high-capacity overflow device — so that when capacity is exceeded, the water lands outside. Many older gutters have nothing.
• Narrowing toward the outlet. A gutter must not reduce in width as it runs unless the depth increases to compensate. Renovations do this accidentally all the time.
• No fall, or a reverse fall. Standing water corrodes a metal gutter from the inside, and the first you know is a pinhole over a bedroom.
• A sump and outlet sized for a smaller roof than the one now draining into it.

What we do about them

We hose-test the gutter under load, check the sole width, fall and freeboard, and look at the sump and outlet. Then the repair is some combination of re-lining or replacing the gutter in formed sheet metal with proper laps, correcting the fall, enlarging the outlet or adding a second, and installing a real overflow. On a bad one, rebuilding the gutter properly is cheaper than the ceiling you will otherwise keep replacing.

Eaves gutters

The everyday gutter on the edge of the roof. Less dramatic when it fails, but it still does real damage.

Rust and perforation. Old galvanised gutter rusts at the back first, where it is hardest to see and where the water sits. By the time it shows at the front, the back has usually gone.

Sagging and bracket failure. Brackets rust out, the gutter drops between them, and water ponds in the low spots instead of running to the downpipe.

Wrong fall. A gutter hung level looks neat and drains badly. Water pools, leaf collects in the pool, and the pool becomes a blockage.

Undersized for the roof. Post-war homes in Merrylands, Guildford, Pendle Hill and Greystanes often have large simple roof planes draining into a modest quad gutter with two downpipes. Rain intensity on the Cumberland Plain in a summer storm will beat that arrangement every time.

Leaf load. Under established gums — common right through Northmead, Oatlands, Dundas and the creek corridors — the gutters fill with bark strips and needles that mat together and hold water.

Downpipes and where the water actually goes

Half the gutter complaints we see are really downpipe or stormwater problems. A gutter cannot discharge faster than the pipe below it will accept.

• Too few downpipes for the roof area, or all of them on one side.
• Downpipes reduced in diameter at a joint by a previous repair.
• A charged line that has silted up and lost most of its bore.
• A stormwater connection that was never actually connected and discharges beside the footings.

On reactive clay soils like those across the Cumberland Plain, water dumping beside the footings is not a cosmetic issue. It drives the seasonal swelling that cracks mortar, including the pointing on your ridge capping. Getting the water away from the house matters.

Fascia, and the damage you do not see

Where a gutter has been overflowing at the back for a few years, the fascia behind it is usually soft. We check it as part of any gutter replacement, because hanging new gutter off rotten timber is pointless. On older homes the fascia may be timber; on later stock it is often steel or a steel capping over timber, and the failure pattern differs.

Leaf guard

Worth doing where the leaf load is genuinely heavy — under gums, next to a park or reserve, near the creek corridors. Choose the product for the debris: a mesh sized for broad leaf will not stop eucalypt needle, and a guard that stops everything also stops water if it is not cleaned. Guard reduces maintenance; it does not end it.

How we price it

Linear metres of gutter, number and run of downpipes, single or double storey, access, whether the fascia needs attention, and whether any of it is box gutter work. Box gutter repairs sit well above eaves gutter work because they are fabrication, not just replacement. We quote in writing after looking at it, and we will tell you if the honest answer is a clean rather than a replacement.

Call (02) 9090 4741 or send the details through.

Related work

Gutters rarely fail alone. If the roof above them is the same age, it is worth looking at roof repairs or a full replacement at the same time, and after a hail or wind event, storm and emergency repairs. We cover every suburb on the service areas list.