• David Jesser

We Replaced this Roof In Watsonia – Check Out the Results!

For this new Colorbond roof replacement we replaced the old concealed guttering and timber fascia with new Colorbond fascia and guttering to give this home a brand-new look!


For this project in Watsonia we completely removed the old roof tiles and replaced with new Colorbond. The house had concealed guttering which is a common cause of water damage to homes built prior to the 90’s in Melbourne. CSM Building & Developments managed the removal of the exiting fascia and extended rafter tails for the new fascia to be installed onto. They also installed new eaves sheets after we completed the Colorbond fascia. As the job needed to have access to multiple levels, a complete wrap around scaffold was used.

Tiled roof replacement in Watsonia - Before

Existing House

Location - Watsonia

Roof Type – Hip and Gable

Roof Pitch – 13°

Material - Terracotta Tiles

Talking Points Skylight Replacement, Concealed Gutter, Tiled Roof

This existing home in Watsonia had problems with the terracotta tiles and concealed guttering. The majority of the homes in this area have concrete tiled roofs, which become porous and brittle after the test of time.

The concealed guttering is not that common in Watsonia but can still be found. The problem with this is that the guttering becomes rusted and will leak into the eaves and onto the fascia. If downpipes are blocked then overflow will occur. Changing to an eaves gutter with overflow provisions will save the house from further water damage.

The shape of the roof is almost a straight gable, but with the addition of an intersecting hip roof at the rear. There is also an existing skylight made of plastic. This has done quite well to last this long against the elements. We will be replacing that with a new double-glazed glass skylight.

Scope of Works

  • Install new Colorbond fascia.

  • Install new Colorbond slotted quad gutter.

  • Remove and dispose of existing roof tiles.

  • Install new timber roof battens for new fixing points.

  • Install 60mm Anticon roof blanket.

  • Install new Colorbond corrugated roof sheets.

  • Install new Colorbond flashings.

  • Install new downpipes.

  • Install new Velux double-glazed skylight.

Selected Colours

Roof Colour - Basalt

Gutter Colour - Basalt

Downpipe Colour – Basalt

Featured Products

Velux Skylight FCM 2222

The Process

Initial Contact – When can I get a free quote?

This job was managed by local building company CSM. We were contacted by the builder to provide a quote for the job at hand. As they were going to be changing the eaves and preparing the roof work; they were to be organizing all the scaffolding, bin hire and help out with the removal of roof tiles. This job was more of a collaboration.

Quote - Will our quote include everything?

We were contacted to quote on this roof replacement in Watsonia by a builder who is friends with the customer. We were approached by email and were able to reply back with a quote within 48hrs after the roof had already been measured and had accurate plans from the building company.

We can also accurately measure your roof from a satellite image, although a site meeting is preferred, we like to keep things personal.

Schedule – When can you start the job?

Lead time varies but for a tile to colorbond conversion it would usually be 4-8 weeks. For this one in Watsonia we scheduled the job 7 weeks in advance. We were needing to coordinate dates and times with the builder and home owner so we used the time leading up to finalize details and have site meetings where required.

We usually ask for a deposit to secure your position in the upcoming weeks.

Delivery - When will the materials arrive?

About a week, prior to starting the job we arranged another site visit to measure up the roof and go over any last-minute changes. The material order was sent into our supplier, who is an authorized Colorbond distributer.

Once the order for the roof is received, our suppliers immediately get to work rolling the sheets, ridges and valleys that will create the roof. They give precise delivery times and update if there are any setbacks. We convey any updates with delivery times with the customer.

The materials are delicately loaded onto a transport vehicle and the staff celebrate the departure of the materials. The materials are delivered promptly onto the Watsonia site and upon arrival are meticulously checked over for any defects and missing items.

Site Safety- Is the job completed safely?

For this job a full house wrap scaffold was used, this made things easy for workers and also gave fall protection. We all want to return home safely each night so site safety is never overlooked.

Tile Removal - How are the tiles removed?

A tile bin arrives and is delivered close to the house so that we may dispose of the tiles by throwing the tiles into the bin (this is our way of having fun). We, together with the carpenters onsite, could strip this roof fairly quickly. But whatever we removed we had to cover that day so there would be no water damage in the event of rain.

Tiled roof replacement in Watsonia - During

Job Start

Now that everything was ready to go, we could start work. The fascia had already been removed by the carpenters we were working with so we were all set up to install the new Colorbond fascia board. That is suspended by rafter brackets fixed onto every rafter. These rafters are spaced quite far apart at 1200mm intervals compared to modern homes approx. 600mm.

After the fascia is installed, we can install the guttering. The guttering selected is quad gutter which is a standard profile. There are overflow slots built into the guttering. The gutter is installed with 1:500 fall and will fall towards the downpipes. This job has five downpipes. Once the fascia and gutter are set up, we can begin with the roof!

We start at the back of the house so we don’t have to carry the heavy tiles over the new Colorbond. We carry stacks of tiles over the roof and launch them into the tile bin. Once we have revealed enough off the roof, we start installing the new timber battens.

The existing tile battens cannot be used to fix the new Colorbond roof sheets down into so that is why we always re-batten the roof. This also gives us nice straight screw lines in the roof sheets that are visible. The tile battens are left in the roof as they are not needed to be removed and would create more labour and mess on the job site. Leaving the tile battens in the roof will also help retain the roof strength, especially if the rafters are at wide intervals as are here.

If the house has one or more valleys, we will replace them while doing the roof. The valleys will be the same colour as the roof.

After the new fixing points are in, we lay the roof blanket down. The roof blanket is backed with silver foil. This roof blanket provides energy efficiency, thermal resistance and noise reduction. Combined with the ceiling batts and the roof vents that we will install; this is a great combination to make the home very comfortable. The insulation we are using is Anticon 60 with a rating of R 1.3.

After the insulation is installed, we can start laying the roof sheets. One by one, the roof sheets are hand-picked and quality assurance tests are performed. The roof sheet is placed into its new home where it will remain for the next several decades. Another roof sheet is lapped over the previous, and so on.

Tiled roof replacement in Watsonia - During

Each individual roof sheet is checked to make sure that they are being laid straight and that they are lapping over correctly.

Any hips and valleys that need to be cut are done so onsite; this house roof is a gable with an intersecting hip so there will be a few sheets to cut at the rear of the house. Once we cut the sheets to match the angle of the roof (we call this the ‘rake’) there will be off-cut sheets that will flip around like a jigsaw puzzle to service another area of the roof.

Once the remaining roof sheets are laid, we install the ridge capping. The ridge capping covers the gap at the apex of the roof.

install the barge flashings (these are for the sides of the roof). These flashings are installed with care and precision. We take our time and do not rush to get things finished (resulting in sub-par work if rushing). All sheets and flashings are screwed down with approved fixings that will stand the test of time against the weather in Watsonia. Fixings are at intervals compliant with regulations.

Any roof penetrations such as chimneys, roof vents, pipes, flues, air conditioners and skylights are re-flashed to make watertight. This roof has a chimney, a skylight, an air-conditioner and a vent pipe.

There was an old plastic skylight that has taken a hit from hail over the years. We replaced with a new Velux double-glazed skylight (665mm x665mm). Velux is a well know brand and trusted in the industry. They provide a ten-year warranty and perform tests on their products to withstand hail damage and have achieved BAL40 bushfire ratings. For this job in Watsonia we installed a back tray flashing up under the ridgeline. This is a preferred method for a low – medium pitch roof, rather than a soaker flashing. It is also less likely to become blocked up with debris and cause roof leaks.

As we are nearing completion, the roof is blown down off all debris and checked over for any imperfections.

Once the main roof work was completed, the builders were able to complete the eaves and the scaffold was disassembled and off hired.

The tile bin is picked up and the content is responsibly disposed of. All old and left-over metals are scrapped and recycled. All other rubbish is cleaned up and taken away from site. For this job there were 2 x 9m² tile bins that removed more than 200m² off roof tiles!

Job Completion

On completion we go through any problems and issues that we may have come across. We email out the compliance certificate along with any other information requested.

Some roof replacements may take us 2-3 days, while others may take 6-7 days. Our philosophy is to not rush anything and value overall quality over speed. We only remove sections of the roof that we can cover in that day, so we rarely require the use of tarps, but if required we have access to hire easily! This roof replacement was completed over 6 days which included the fascia, guttering and downpipes and site clean-up.

Tiled roof replacement in Watsonia - After

Tiled roof replacement in Watsonia - After


Garry was very happy with the finished result and commented that people passing by in Watsonia would make positive comments about the new roof. He was happy to be a reference for another roof replacement proposal in Greensborough.


Thanks for reading, now you have a step by step account of the process we go through with our customers to transform their roofs. Stay up to date with our blog posts for more projects coming soon.

If you or someone you know are in Watsonia and the surrounding areas and could be interested in having a similar project completed, get in touch with us today!


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Sunday: Closed

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