COLORBOND ROOFING
Q: How long does a Colorbond roof last?
A: A Colorbond roof installed by a licensed roof plumber will typically last between 50 and 70 years, depending on your environment and how well it's maintained. Coastal properties benefit from Colorbond Ultra, which is specifically engineered to resist salt air corrosion and is ideal for homes on the Central Coast.
Q: Does Colorbond make the house hotter in summer?
A: This is one of the most common concerns — and the answer is no, not if it's installed correctly. Lighter Colorbond colours reflect significantly more heat than darker shades, and when paired with a quality insulation blanket (like Bradford Anticon) under the sheeting, your home can actually be cooler and more energy efficient than with an uninsulated tile roof. Colorbond also cools down quickly after sunset, unlike tiles which retain heat.
Q: Will a Colorbond roof be noisy when it rains?
A: Without insulation, yes — rain on a metal roof can be noisy. However, a foil-backed insulation blanket installed under the sheeting significantly dampens rain and hail noise. Most homeowners with insulated Colorbond roofs report little difference to tiles in terms of noise.
Q: Which Colorbond colour is best for a coastal property?
A: For properties on the Central Coast, we recommend lighter to mid-tone colours such as Surfmist, Shale Grey, or Dune — these reflect more heat and show less fading over time. We also recommend specifying Colorbond Ultra steel for coastal locations, as it has enhanced protection against salt air corrosion compared to the standard range.
Q: How do I maintain a Colorbond roof?
A: Colorbond is very low maintenance compared to tiles. We recommend an annual inspection to check flashings, fasteners, and gutters, and a gentle rinse-down of the roof sheets if your property is exposed to salt air or significant tree debris. Avoid walking on the roof unless necessary, and if you do need access, use roof walkway planks to distribute your weight.
INSULATION UNDER ROOF SHEETING
Q: What is insulation blanket (Anticon) and do I need it?
A: An Anticon blanket (such as Bradford Anticon) is a foil-faced fibreglass blanket that sits directly under your metal roof sheeting. It serves three purposes: it slows heat transfer into your home, it prevents condensation from forming on the underside of the sheets, and it reduces rain noise. For any home or habitable building, we strongly recommend including it as part of your re-roofing project.
Q: What R-value insulation blanket should I use under a Colorbond roof in NSW?
A: For the Central Coast and NSW in general, an R-value of R1.3 to R1.8 under the roof sheets (typically 60mm–80mm Anticon) is standard. However, for best comfort and energy efficiency, this should be combined with ceiling batts rated R3.5 to R5.0 in the roof cavity. The combination of under-roof blanket and ceiling batts is what delivers real thermal performance — the blanket alone isn't enough for a comfortable home year-round.
Q: Can insulation be added to an existing Colorbond roof?
A: Unfortunately, not easily. The insulation blanket must be installed during the roofing process — it sits between the battens and the roof sheets, so adding it later would effectively mean removing and re-laying all the roof sheeting. If your existing roof has no insulation and you're experiencing comfort or condensation issues, the most effective solution is a full re-roof that includes the blanket as part of the installation.
Q: What is sarking and is it the same as an insulation blanket?
A: Sarking and an insulation blanket are similar but not identical. Sarking is a foil-only membrane that acts primarily as a moisture barrier and provides a small amount of radiant heat reflection. An insulation blanket (like Anticon) combines foil sarking with a fibreglass wool layer, giving you significantly better thermal and acoustic performance. If you're re-roofing a habitable space, we always recommend the full insulation blanket rather than sarking alone.
TILE TO COLORBOND CONVERSION
Q: What are the benefits of replacing old tiles with Colorbond?
A: There are several significant benefits: Colorbond weighs up to 90% less than concrete tiles, which reduces stress on your roof frame and walls. It has a lifespan of 50–70 years with minimal maintenance. It won't crack, shift, or grow moss like ageing tiles. It provides better protection during storms due to its interlocking sheet design. You also gain the opportunity to add quality insulation during the process, which wasn't possible with the original tile installation.
Q: How much does it cost to replace tiles with Colorbond in NSW?
A: For a typical single-storey Central Coast home, a tile-to-Colorbond conversion generally ranges from $15,000 to $30,000, depending on roof size, complexity, pitch, and whether any structural repairs or new battens are required. Two-storey homes will sit higher due to scaffolding requirements. Getting a free on-site quote is the most reliable way to get an accurate price for your specific property.
Q: Do I need to replace my gutters when converting from tiles to Colorbond?
A: Not always, but it's worth considering. If your gutters are original and the same age as your old tile roof, replacing them at the same time makes practical sense — it avoids revisiting the same area of work later and ensures everything looks consistent. We'll always inspect your existing gutters as part of the quoting process and advise honestly on whether replacement is necessary or just recommended.
Q: Will my roof frame need to be strengthened for Colorbond?
A: In most cases, no — the opposite is true. Colorbond is so much lighter than concrete tiles that your existing roof frame is actually under less stress after the conversion. However, we do inspect the frame as part of every re-roofing job. If any battens, rafters, or tie-down hardware show signs of wear or damage, we'll address these before the new sheets go on.
Q: Do I need council approval to convert my tile roof to Colorbond?
A: In most cases in NSW, a like-for-like re-roof or tile-to-metal conversion is considered exempt development and doesn't require council approval, provided the work meets the National Construction Code. However, if your property is heritage listed, in a heritage conservation area, or if you're making significant changes to the roofline, you may need to check with your local council. We can advise on this during your free quote.
GENERAL ROOFING QUESTIONS
Q: How do I know if my roof needs replacing or just repairing?
A: A repair is usually sufficient if damage is isolated — for example, a section of flashing has failed, a small area of sheeting has been damaged by a fallen branch, or a gutter joint has failed. Replacement becomes the better option when the roof is over 30–40 years old, when there are multiple problem areas appearing at once, when sheeting is corroding, or when the insulation under the roof (if any) has deteriorated. We'll give you an honest assessment during a free inspection.
Q: How long does a roof replacement typically take?
A: For a standard single-storey home, a full re-roof typically takes 2–5 days depending on size and complexity. Two-storey or complex rooflines with multiple gables, valleys, or skylights will take longer. We'll always give you a clear timeframe before starting, and we work to minimise disruption to your household throughout the process.
Q: Can you work directly with my insurance company for storm damage repairs?
A: Yes — we work with all major insurers and insurance builders for storm and hail damage claims. We can provide full inspection reports, photos, and scope of works documentation to support your claim, as well as emergency make-safe and tarping services if your roof has been compromised. We're available 24/7 for emergency response on the Central Coast, Sydney, and Hunter Valley.
Q: Do I need a licensed roof plumber for roofing work in NSW?
A: Yes. In NSW, roof plumbing work — including the installation, replacement, and repair of metal roofing, gutters, and downpipes — must be carried out by a licensed roof plumber. Always ask for your contractor's licence number before any work begins. JMR Roofing holds a current NSW roof plumbing licence (Lic. 346016C) and all work is fully insured.