Brookvale is the working centre of the Northern Beaches: the largest industrial and commercial area on the peninsula, wrapped around Westfield Warringah Mall, the bus depot, the car dealerships and the printing trade. That mix puts two completely different kinds of roof within a few streets of each other, and they fail in different ways.
The blocks bounded by Pittwater Road, Old Pittwater Road, Cross Street and Winbourne Road carry the densest run of commercial roofing on the peninsula. Retail and light industrial roofs here are almost all low-pitch sheet metal, and almost all draining internally. When one of them backs up, the water has nowhere to go but through the ceiling of a trading business.
Brookvale sits low relative to the ridges either side of it, and stormwater from a large catchment passes through the suburb on its way to the lagoon. That means downpipe and stormwater connections matter more here than the gutter itself: a gutter that drains into a blocked or undersized connection will overflow no matter how clean it is.
Awnings, canopies and roller-door lintels are where commercial roofs in Brookvale actually leak. They are added later, flashed into an existing roof, and the junction between old and new is rarely detailed as well as the original. It is the first place we look on a workshop or a dealership.
Warehouse and workshop roofs in Brookvale are wide, low-pitched sheet metal draining into internal box gutters rather than eaves gutters. A box gutter is a different animal: it has to be designed to AS/NZS 3500.3, and when it overflows the water goes inside the building, not over the edge. Most of the urgent calls we get from Brookvale businesses are box gutters, not roofs.
Away from the industrial blocks, Brookvale is largely mid-century housing with concrete tile or early Colorbond roofs. Both are now at the age where the pointing has gone brittle and the original fasteners have given up, and both are cheap to fix now and expensive to fix later.
Gutters near the industrial blocks collect a fine, heavy grit that ordinary leaf debris does not. It holds moisture against the base of the gutter and starts corrosion from the inside, so a Brookvale gutter can rust through while looking clear from the ground.
Commercial roof work in Brookvale means working around trading hours, staff and deliveries. We plan access before quoting rather than turning up and finding a truck bay under the only safe set-up point.
Yes. Box gutters, sheet metal roofing, downpipes and stormwater connections on warehouses, workshops and retail. We are fully insured for commercial sites and can work outside trading hours where access needs it.
Fine industrial grit settles in the base of the gutter and holds water against the metal. It never looks blocked, but the gutter corrodes from the inside out. It is the most common thing we find on the industrial side of the suburb.
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Australian standards and Code requirements we work to, with the source for each.
A valley gutter must be laid at more than 12.5 degrees, with at least 15 mm of freeboard and side angles of 12.5 degrees or more. Below 12.5 degrees it has to be designed as a box gutter to AS/NZS 3500.3 instead, which is a different job with different flashing.
The Code requires downpipes to sit as close as practical to where valley gutters discharge. On roofs with several valleys feeding one length of gutter, a downpipe in the wrong position overloads that section long before the rest of the run fills.
The National Construction Code allows a single downpipe to serve no more than 12 metres of eaves gutter. Long unbroken runs on Sydney terraces and wide Federation frontages often sit over that limit, which is why they overflow in heavy rain even when the gutter is clean.
Quoting brookvale in the Northern Beaches is not the same job as quoting it elsewhere in Sydney. A cleared block can still be bushfire prone: Category 1 vegetation carries a 100 metre buffer on the Council map and categories 2 and 3 carry 30 metres, so a property with no trees… That is the kind of detail that changes the materials, the timing and the paperwork on a roof in Manly or the streets around it. Everything below links to the council or standard it comes from, so you can check it yourself.
Category 1 vegetation carries a 100 metre buffer on the Council map and categories 2 and 3 carry 30 metres, so a property with no trees on it can still be mapped simply because of the reserve next door. Work on mapped land can pull in AS 3959 requirements.
Source: Northern Beaches Council, bush fire prone landThe Rural Fire Service advises against box gutters and complicated roof shapes on bushfire prone land because they trap debris, and warns that second storey gutters make last minute clearing dangerous. Removing litter from roof, valleys and gutters before summer is part of protecting the house.
Source: NSW Rural Fire ServiceBlueScope names Manly Beach as its metropolitan example of a surf marine environment, the harshest of its three salt classes under AS 4312. Wind, shelter and areas the rain never washes push the real corrosivity higher still, which is why the steel grade used here is not the one used inland.
Source: BlueScope Technical Bulletin TB-35 and AS 4312:2019Class 3 fasteners are only acceptable beyond 1km from marine influence. From 200m to 1km Class 4 is required, and inside 200m even Class 4 is not enough without checking with the supplier. Most of the ocean strip sits inside that band, so standard screws rust out long before the sheeting does.
Source: BlueScope TB-16 and AS 3566.2The standard warranty requires fresh water washing at least every six months of any roof area rain does not wash naturally, and does not cover failure to replace corroded fasteners. On a coastal home that means eaves, awnings and wall abutments need washing deliberately.
Source: BlueScope, Colorbond roofing sample warrantyWe cover Manly, Fairlight, Freshwater, Curl Curl, Dee Why, Collaroy, Narrabeen, Warriewood, Mona Vale, Newport, Bilgola, Avalon, Whale Beach, Palm Beach, Frenchs Forest, Belrose, Terrey Hills, Forestville, Killarney Heights, Balgowlah, Seaforth, Brookvale, Cromer, Elanora Heights, Bayview and Church Point.
Category 1 vegetation carries a 100 metre buffer on the Council map and categories 2 and 3 carry 30 metres, so a property with no trees on it can still be mapped simply because of the reserve next door. Work on mapped land can pull in AS 3959 requirements.
The Rural Fire Service advises against box gutters and complicated roof shapes on bushfire prone land because they trap debris, and warns that second storey gutters make last minute clearing dangerous. Removing litter from roof, valleys and gutters before summer is part of protecting the house.
BlueScope names Manly Beach as its metropolitan example of a surf marine environment, the harshest of its three salt classes under AS 4312. Wind, shelter and areas the rain never washes push the real corrosivity higher still, which is why the steel grade used here is not the one used inland.
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