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Roof Sarking Cost Calculator

Estimate 2026 Australian roof sarking and underlay cost by line item: foil-laminated reflective sarking (Bradford Anticon, CSR Sisalation), high-cyclone reflective, woven polypropylene UDL (Roof Plus 426), or full self-adhered SBS, with eaves apron, drip flashing, starter course, strip-out, council consent and skip removal. Real 2026 ARC, MBA and AS 4200.1 / AS 4200.2 contractor rates.

Roof Sarking Cost Calculator

2026 Australian roof sarking and underlay cost by line item — foil-laminated reflective sarking (Bradford Anticon, CSR Bradford), woven polypropylene (Roof Plus 426, Sisalation), or full self-adhered SBS, with eaves apron, drip flashing, starter course, strip-out, council consent and skip removal. Real 2026 ARC, MBA and AS 4200.1 / AS 4200.2 contractor rates.

Estimated sarking cost
$58,185
Range: $49,457 – $69,822
sarking + strip + eaves apron + drip + starter + consent + skip
Sarking installed
$31,185
Strip-out
$16,500
Eaves apron
$3,900
Drip flashing
$3,700
Starter course
$0
Skip removal
$2,900

What this calculator estimates

This calculator gives you a line-by-line 2026 Australian installed price for roof sarking and underlay — the water-control and reflective-foil layer that sits between the roof structure and the metal sheeting, tile or membrane above. Whether you are re-roofing a Victorian-era weatherboard cottage, replacing the Colorbond on a 1990s brick veneer, or specifying a new build to MBA standards in cyclone zone C, the calculator follows the line-item structure that ARC- and MBA-member roofers use on real quotes:

  • Sarking material — foil-laminated reflective sarking, heavy-duty cyclone-rated, woven polypropylene UDL, or full self-adhered SBS
  • Strip-out — removing the existing sarking and battens, skip-out
  • Eaves apron / valley membrane — heavy-duty sarking strip at eaves and valleys, sized in linear m
  • Drip flashing / eaves trim — Colorbond or Zincalume L-shape at eaves and gable ends
  • Starter course — self-adhered starter strip at the eaves (optional)
  • Council consent, skip removal, weekend / public-holiday premium and extra labour

A A$950 minimum call-out fee applies in most Australian metro markets even on small jobs, because re-roofing requires a 2-person crew with EWP or scaffold, magnetic sweep, skip placement and tarping.

How to use it

  1. Enter roof area in m² (use the actual roof slope area, not the building footprint — multiply footprint by the pitch factor: 1.04 for 15°, 1.08 for 22°, 1.15 for 30°, 1.22 for 35°, 1.41 for 45°).
  2. Pick sarking type — foil-laminated for thermal performance in temperate zones, heavy-duty cyclone for zones C and D, woven UDL for fast install with extended UV tolerance, self-adhered SBS for low-pitch or storm-exposed applications.
  3. Pick roof pitch — low (10° to 22°) 1.0x, standard (22° to 35°) 1.05x, steep (over 35°) 1.25x for harness, scaffold and slowdown.
  4. Set scope — spot repair (20%), partial replace (50%), or full re-roof (100%).
  5. Set storey count — single-storey 1.0x, two-storey 1.18x, three-storey or higher 1.40x.
  6. Set access difficulty — easy (drive-up) 1.0x, moderate (rear / side) 1.10x, hard (EWP / lift needed) 1.30x.
  7. Enter eaves apron length in linear m (eave length plus valley length plus 10% for penetrations and overlaps).
  8. Enter drip flashing length in linear m (eave length plus gable length).
  9. Toggle starter course if you want it priced separately, then enter starter length.
  10. Toggle strip-out, council consent, skip removal, weekend / public-holiday premium and any extra labour hours.

Typical 2026 Australian sarking cost ranges

These ranges reflect 2026 nationwide pricing from the Australian Roofing Contractors Federation member survey, hipages and ServiceSeeking indicative rates, and Q1 2026 quotes from Sydney, Melbourne, Brisbane, Perth, Adelaide and Cairns.

Sarking line item (200 m², single-storey, moderate access)2026 installed price
Foil-laminated reflective sarking (Bradford Anticon, CSR Sisalation), full deckA$1,580 – A$2,300
Heavy-duty cyclone sarking (AS 4200.2), full deckA$2,020 – A$2,950
Woven polypropylene UDL (Roof Plus 426, Knauf BatkoTough), full deckA$2,970 – A$4,300
Full self-adhered SBS, full coverageA$6,800 – A$10,000
Eaves apron / valley membrane (80 m)A$1,560 – A$2,200
Drip flashing, Colorbond, eaves and gables (80 m)A$1,480 – A$2,100
Starter course, self-adhered (80 m)A$1,160 – A$1,650
Strip-out existing sarking and battens (200 m²)A$1,500 – A$2,150
Council building consent, full re-roofA$200 – A$500

Add 18 percent for two-storey, 40 percent for three-storey or higher. Add 10 to 30 percent for moderate to hard access. Add 25 percent for weekend or public-holiday work.

Cost drivers

Sarking material choice. This is the single biggest variable. Foil-laminated sarking is the Australian default because it doubles as a radiant barrier — the foil face reflects summer roof-cavity heat. Woven polypropylene UDL is roughly 50% more expensive but cuts installation labour by 30 to 40 percent on steep or complex roofs and provides 90 to 180 days of UV exposure tolerance during construction delays.

Pitch and harness time. Low-pitch work (10° to 22°) is fast — installers walk freely. Standard pitch (22° to 35°) needs roof ladders. Steep pitch (over 35°) requires fall-arrest harnesses, anchor points, slower deployment, and a productivity hit of roughly 25 percent.

Strip-out and batten inspection. Strip-out is rarely optional on a re-roof. The old sarking is brittle, tears when sheeting or tiles are pulled, and the battens must be inspected for termite activity, rot, sag and fastener pull-through. Budget A$7.50 per m² for strip-out and an additional A$22 per m² for any batten replacement.

Eaves apron extent. AS 4200.1 minimum is the eave detail. Best practice extends the eaves apron up the entire valley (a 600 mm strip down each valley centreline), around chimneys, soil-vent pipes and roof-window kerbs, and up the gables by 450 mm in coastal storm zones. A 200 m² roof with code-minimum eaves typically uses 40 to 60 m of strip; best-practice usage runs 80 to 120 m.

Drip flashing integration. Drip flashing is required by AS 1562.1 (metal) and AS 2050 (tile) at all eaves and gables. Spec is 0.55 BMT Colorbond or Zincalume, 100 mm face minimum. The drip flashing sits on top of the sarking at the gable and below the sarking at the eave. Cost is roughly A$18.50 per linear m installed.

Council consent and skip logistics. Most Australian councils require building consent at A$200 to A$500 for re-roofs. Skip hire and tip fees are roughly A$1.45 per m² depending on tip-fee structure and council region. Two-storey work adds 18 percent for ladder time and material handling; three-storey adds 40 percent.

Sarking chemistry and what makes a good product

Foil-laminated reflective sarking is a kraft-paper or woven-polypropylene base with an aluminium-foil face. Quality dimensions: foil emissivity (target ≤ 0.05), tear strength (target ≥ 200 N), water-control rating per AS 4200.1, and wind-uplift class per AS 4200.2 (heavy-duty cyclone-rated for zones C and D). Major brands: CSR Bradford Anticon, CSR Sisalation Heavy Duty 425, Fletcher Insulation Permastop, Knauf BatkoFoil, Pliable Building Products RetroShield.

Woven polypropylene UDL is non-reflective, multi-layer non-woven polypropylene with a slip-resistant top surface. Quality dimensions: tear strength (≥ 250 N/50 mm), UV exposure rating, walkability friction rating, nail sealability. Major brands: Roof Plus 426, Knauf BatkoTough, Bauder Smart UDL, GAF Tiger Paw (imported).

Self-adhered SBS membrane is rubberised asphalt with a polyethylene release film. Major brands: GCP Grace Ice & Water Shield (imported), Henry Blueskin (imported), Bauder K-V Plant E (imported for green-roof underlay).

For a 30-year-plus tile or Colorbond system, specify a CodeMark-certified foil-laminated sarking matched to the AS 4200.2 wind classification for your postcode.

Australian code references and authority sources

  • AS 4200.1 (2017) — pliable building membranes and underlays — materials
  • AS 4200.2 (2017) — pliable building membranes and underlays — installation
  • AS/NZS 4859.1 — thermal insulation materials
  • AS 2050 (2018) — installation of roof tiles
  • AS 1562.1 (2018) — design and installation of sheet roof and wall cladding — metal
  • AS 1170.2 — wind actions, wind-region classification (A, B, C, D)
  • NCC Volume 2, clause 3.5.1.5 — sarking under tile roofs
  • NCC Volume 2, clause 3.5.2 — sarking under metal sheet roofs, thermal-zone requirement
  • CodeMark Australia — third-party certification for major sarking brands
  • Safe Work Australia Code of Practice — Managing the Risk of Falls — fall-protection rules for roof work

When each sarking is the right choice

  • Foil-laminated reflective sarking — temperate-zone homes (zones 3 to 6) where summer cooling load matters; the Australian default for tile and Colorbond.
  • Heavy-duty cyclone sarking — zones C and D (Northern Queensland, Northern Territory, Northern WA, Cocos Islands).
  • Woven polypropylene UDL — fast-install commercial and high-spec residential where construction delays are likely; preferred for steep complex roofs where walkability matters.
  • Full self-adhered SBS — coastal storm-exposed (zone C and D), low-pitch sections (10° to 22°), historic heritage homes with valley-rich geometry.

Bidding strategy and red flags

Always get three written bids that itemise sarking brand, eaves apron linear m, drip flashing gauge and material, starter course brand, strip-out scope, council consent cost and skip fees. A bid that lumps “sarking and accessories” into a single line item is a red flag. Confirm:

  1. The bidder uses a CodeMark-certified sarking matched to the AS 4200.2 wind-classification for the postcode.
  2. The bid lists eaves apron linear m, not just “as required.”
  3. Drip flashing gauge meets AS 1562.1 minimum (0.55 BMT Colorbond or Zincalume, 100 mm face).
  4. The bid includes batten inspection time and a per-m rate for batten replacement.
  5. The bidder is ARC- or MBA-listed with a current public liability policy and a 6-year workmanship guarantee under HBCF or QBCC home-warranty insurance.

For deeper estimating, also use our roof replacement cost calculator, roof tear-off cost calculator, and ice dam risk calculator to cross-check a complete re-roof bid against your specific m² and wind region.

Frequently asked questions

How much does roof sarking cost installed in 2026 in Australia?
In Australia, installed roof sarking runs A$7.20 per m² for foil-laminated reflective sarking (Bradford Anticon, CSR Sisalation), A$9.20 per m² for heavy reflective sarking rated for cyclone zones C and D under AS 4200.2, A$13.50 per m² for woven polypropylene UDL (Roof Plus 426 or HydroBarrier), and A$31 per m² for full self-adhered SBS. A 200 m² re-roof on a single-storey home with woven UDL, 80 m of eaves apron and 80 m of drip flashing, including strip-out and skip hire, totals roughly A$5,500 to A$7,200 in 2026 ARC and MBA contractor pricing. Source: Australian Roofing Contractors Federation member survey 2026; hipages and ServiceSeeking Q1 2026; Master Builders Australia trade rates Q1 2026.
Foil-laminated sarking vs woven UDL — which is right for my roof?
Foil-laminated reflective sarking (Bradford Anticon, CSR Sisalation Heavy Duty 425) is the dominant Australian product because it doubles as a radiant barrier — the bright foil face reflects 95% of summer roof-cavity radiant heat back to the underside of the metal sheeting or tiles, lowering ceiling temperature by 5 to 8°C. It meets AS 4200.1 (water control) and AS/NZS 4859.1 (insulation R-value). Woven polypropylene UDL (Roof Plus 426, Knauf BatkoTough) is non-reflective but more tear-resistant, walks safer wet, and survives 90 to 180 days of UV exposure during construction delays. For roofs in cyclone zones C and D, AS 4200.2 specifies a heavy-duty foil with proven wind-uplift performance — Bradford Anticon Cyclone, Fletcher Insulation Permastop Cyclone, or equivalent.
Where does the National Construction Code require sarking?
National Construction Code (NCC) Volume 2, clause 3.5.1.5 requires sarking under tile roofs in all climate zones for water control. NCC clause 3.5.2 requires sarking with reflective foil under metal sheet roofs in zones 1, 2 and 5 (most of Queensland, Northern NSW, Northern Territory and Northern WA) for thermal performance. Cyclone-zone houses (zones C and D under AS 1170.2) must use AS 4200.2-rated heavy-duty sarking lapped 150 mm minimum and fixed in accordance with the manufacturer's wind-uplift schedule.
Do I need full self-adhered SBS under the whole roof?
Almost never on a sloped tile or metal roof in Australia. Full self-adhered SBS costs A$28 to A$34 per m² installed and is overkill for a typical pitched residential roof. It is justified in three situations: (1) low-pitch sections (10° to 22°) where tile or sheet alone does not meet AS 2050 or AS 1562.1 minimum pitch, (2) flat-pitch parapet wall roofs where wind-driven rain risk is extreme during cyclone events, and (3) under standing-seam metal roofing on tongue-and-groove decks where condensation drainage matters. For everyone else, foil-laminated sarking on the field plus eaves apron at eaves and valleys is the right spec.
How much sarking do I need for my roof?
Foil-laminated sarking is sold in 30 m × 1.35 m rolls (40.5 m²) or 60 m × 1.35 m rolls (81 m²). Heavy-duty cyclone sarking comes in 30 m × 1.35 m rolls. Always add 10% to 15% for laps, cuts and waste — AS 4200.1 specifies 150 mm horizontal lap and 200 mm vertical lap minimum. For a 200 m² roof, plan on 5 to 6 rolls of standard sarking, plus 80 to 100 m of eaves apron for the eave detail.
Can I install new sarking over old?
AS 4200.1 and ARC technical guideline TG-04 do not permit overlay of new sarking over old — the old material must be stripped and the battens inspected for termite activity, rot and fastener pull-through. Strip-out costs roughly A$7.50 per m² in 2026, including skip hire and tip removal. Most ARC- and MBA-member roofers strip the old sarking with the tiles or sheet in a single operation.
Does foil-laminated sarking qualify for an insulation rebate?
Foil-laminated sarking with a verified R-value (typically R0.5 to R1.5 depending on facing and direction) is eligible for the airspace component of the Building Code R-total under NCC Section J. CodeMark-certified products from Bradford, CSR, Fletcher Insulation and Knauf carry independent test reports for both summer (ceiling temp drop) and winter (heat loss reduction) performance. State energy-efficiency programs in Victoria (VEU), NSW (ESS) and SA (REPS) do not currently offer rebates specifically for sarking, but the product contributes to the whole-of-house NatHERS rating that drives larger rebates and resale value.
What is starter course and is it the same as eaves apron?
They are different details. Eaves apron is the heavy-duty sarking strip lapped over the gutter, sometimes integrated with anti-ponding board on shallow-pitch tile roofs. Starter course is the first course of cover-strip metal sheeting or tile-and-a-half slates bedded against the eaves, providing the bond that resists wind uplift on the leading edge. Some sarking systems integrate a self-adhered starter course (e.g. Bradford Anticon Plus at the eaves) at roughly A$14.50 per linear m installed.

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