We check your roof, external walls, windows and their junctions against the NCC 2025 weatherproofing Deemed-to-Satisfy Provisions. You get a clear list of the gaps while the drawings can still change.
Request a Fee Proposal →Send us your drawings and window schedule. We'll confirm the NCC edition, any state variation and the elements in scope, then send a quote.
A weatherproofing Deemed-to-Satisfy assessment reviews a building's drawings and specifications against the NCC 2025 weatherproofing DtS Provisions. The clauses we assess are:
Makao gives the project team a gap list and detail comments. Your building surveyor or certifier makes the compliance decision.
Open wall and roof faces usually shed water well. The trouble starts where systems meet: window heads and sills, roof-to-wall junctions, parapets, balcony thresholds, penetrations and control joints. The NCC requires the roof, external walls, openings, balconies and podiums to manage rain so it doesn't cause unhealthy conditions or damage building elements: F1P1 for Class 2 to 9 buildings and H2P2 for houses. The Deemed-to-Satisfy Provisions set out the standards each element needs to follow to get there.
For Class 2 to 9 buildings, the wall cladding clause F1D15 lists only masonry (AS 3700), autoclaved aerated concrete (AS 5146.3) and metal wall cladding (AS 1562.1). Glazing clause F1D14 excludes site-built and one-off windows that aren't design-tested to AS 2047. Knowing early which elements fit DtS and which don't saves rework.
Victoria has applied NCC 2025 since 1 May 2026. Specifications and product evidence that still cite NCC 2022 Part F3 need re-referencing to Part F1.
A gap found on the drawings is a detail change. We aim to find the gaps while the design can still change.
Performance Requirement F1P1 (Managing rainwater impact on the building and adjoining properties) covers both rainwater management and weatherproofing:
Under F1D1, a Deemed-to-Satisfy Solution satisfies F1P1 by following F1D2 to F1D15. The weatherproofing clauses we assess are:
Performance Requirement H2P2 Weatherproofing: A roof and external wall, including the openings around windows and doors, must prevent water penetration that could cause:
For Class 10 buildings, H2P2(a) applies only where the Class 10 building contributes to weatherproofing the Class 1 building. The clauses we assess are:
NCC 2025 removed Volume One Part F3 Roof and wall cladding and moved its content into Part F1. F3P1 Weatherproofing and the NCC 2022 rainwater requirements F1P1 to F1P3 are now combined in F1P1. F3V1 is now F1V1. F3D2 to F3D5 (roof coverings, sarking, glazed assemblies and wall cladding) are now F1D12 to F1D15. The NCC 2022 exposed joints and external waterproofing membrane clauses F1D4 and F1D5 are now F1D6 and F1D7.
Internal wet areas (Part F2 and the Volume Two wet-area provisions); building sealing for energy efficiency (Section J, including J1V4); structural and wind design; cladding fire performance and combustibility; and test-based Verification Methods and Performance Solutions.
All deliverables are advice to the project team. They are not a certificate, and they don't state that the design complies. Your building surveyor or certifier decides compliance.
We check the roof coverings, sarking, glazed assemblies, wall cladding, external waterproofing membranes and exposed joints against F1D6, F1D7 and F1D12 to F1D15 (Volume One) or H2D6 to H2D8 (Volume Two), including the cited Australian Standards and the clause exemptions.
Every element or detail where the documents don't follow the DtS Provisions, or where the information isn't there to tell. Each item shows the clause, the drawing or specification reference, and the options to close the gap within DtS (for example a different product, an added membrane or a revised detail).
Window-to-wall, roof-to-wall, parapets, balconies and thresholds, penetrations and control joints, checked against the DtS clauses and their standards. We read the same details for condensation risk; see our hygrothermal modelling page.
Where an element can't follow DtS (for example cladding outside the F1D15 list, or site-built windows not design-tested to AS 2047), we flag it early so your team can engage the right specialist.
NCC 2022 Part F3 references in specifications and product data are mapped to NCC 2025 Part F1.
The NCC allows other compliance pathways (A2G1). Where a test-based Verification Method or Performance Solution is needed, that sits with the façade engineer, a testing laboratory and the building surveyor. We flag those elements in the gap list so your team can bring in the right specialist early.
Design-review prompts we check on every project.
When it sits outside the F1D15 list.
Specifications and product data still citing F3P1 or F3D2 to F3D5 on NCC 2025 projects.
In the schedule, or site-built and one-off windows not design-tested to AS 2047 (outside F1D14).
Under planters or water features, or away from the high point of the substrate (F1D6).
Where F1D7 or H2D8 requires them on roofs, balconies and podiums.
Required by F1D13.
Window heads and sills, parapet cappings, roof-to-wall abutments and penetrations.
A membrane chosen for rain can trap vapour. Check both: Part F8 for Class 2 sole-occupancy units and Class 4 parts, and Part H4 for houses.
Elevations, sections, wall and roof build-ups, window schedule, and cladding, sarking and membrane product data.
We confirm the NCC edition and any state variation, the building class and the elements in scope, then send a quote.
We review the documents against the DtS clauses and send you the gap list and detail comments.
We walk the architect, supplier and builder through the gaps and the options to close them within DtS, and flag anything that needs another pathway.
Turnaround: Timeframes confirmed at quote; fast-track available for urgent projects.
It is a review of your drawings and specifications against the NCC 2025 weatherproofing Deemed-to-Satisfy Provisions. For Class 2 to 9 buildings we assess F1D6, F1D7 and F1D12 to F1D15, against F1P1. For Class 1 and 10 buildings we assess H2D6 to H2D8, against H2P2. You receive a gap list and detail comments to help your project team. Your building surveyor or certifier makes the compliance decision.
Volume One covers Class 2 to 9 buildings. The clauses we assess are F1D6 exposed joints, F1D7 external waterproofing membranes, F1D12 roof coverings, F1D13 sarking, F1D14 glazed assemblies and F1D15 wall cladding. Volume Two covers Class 1 and 10 buildings. The clauses we assess are H2D6 roof and wall cladding, H2D7 glazing and H2D8 external waterproofing.
NCC 2025 removed Volume One Part F3 Roof and wall cladding and moved its content into Part F1 Water management. F3P1 is now within F1P1, and the Deemed-to-Satisfy Provisions F3D2 to F3D5 are now F1D12 to F1D15. Victoria adopted NCC 2025 on 1 May 2026, so reports and specifications citing Part F3 need re-referencing.
For Class 2 to 9 buildings, F1D15 lists masonry to AS 3700, autoclaved aerated concrete to AS 5146.3 and metal wall cladding to AS 1562.1. Other claddings, such as fibre cement, timber or composite panels, sit outside that list. Our assessment flags them so your team can decide on another compliance pathway with the right specialist. For houses the list is wider: through H1D7(4) to (6), H2D6 also covers timber and composite cladding (including fibre cement) to the ABCB Housing Provisions Part 7.5, autoclaved aerated concrete, metal wall cladding, and external wall insulation and finish systems to AS 5346 other than direct-fix systems.
Yes, for most glazed assemblies in an external wall. F1D14 requires windows, framed glazed doors, adjustable louvres, shopfronts and one-piece window walls to meet the AS 2047 water penetration requirements. Skylights, fixed louvres, frameless doors, site-built and one-off windows not design-tested to AS 2047, and re-used or heritage windows are outside that clause. For houses, H2D7 points to H1D8(1), which references AS 2047 for windows.
Yes. We review roof coverings against F1D12, sarking against F1D13, and roofs, balconies and podiums against F1D7 external waterproofing membranes and F1D6 exposed joints. For houses, we review flat roofs, terraces and balconies above internal spaces against H2D8. Internal wet areas are not part of this assessment.
We flag it in the gap list so your team can engage the right specialist early. Other compliance pathways are outside our scope.
Weatherproofing keeps rain and surface water out of the building (F1P1 and H2P2). Condensation management deals with water vapour from inside the building condensing within walls and roofs (F8P1 for Class 2 sole-occupancy units and Class 4 parts, and H4P7 for Class 1 buildings). A wall needs both. We review the same details for both, and use hygrothermal modelling where condensation risk needs a closer check.
No. Our assessment is advice to the project team. Your building surveyor or certifier decides compliance and issues the building permit or approval. We do not test façades or prepare Performance Solutions. We also do not provide structural or wind design, or cladding fire and combustibility assessments.
Timeframes are confirmed at quote, and fast-track is available for urgent projects. Fees depend on the building type, the number of roof, wall and glazing systems, and the number of junction details. Send us your drawings and we will give you a quote after a short review.
Yes. We are based in Melbourne and work Australia-wide. The NCC weatherproofing provisions are national, but some states and territories have variations, so we check the edition and variations that apply to your project first.
We work from NCC 2025, which Victoria has applied since 1 May 2026 under the Building Act 1993 and the Building Regulations 2018. We check state variations on every project.
The junctions we check for weatherproofing are the same ones that drive condensation, thermal bridging and airtightness. We look at them together, so one fix doesn't create another problem.
Our assessment is advice to your project team. Your building surveyor or certifier decides compliance. Where something falls outside DtS, we tell you early so the right specialist can pick it up.
Based in Melbourne, working on projects Australia-wide.
Our founder, Kelvin Mureithi: Green Star Accredited Professional, ISAP, Engineers Australia member.
Reviewed by Kelvin Mureithi, Founder, Makao · Green Star Accredited Professional, ISAP, Engineers Australia member.
Copy this prompt into ChatGPT, Claude or Perplexity, fill in the brackets, and get a first read on your project.
I'm working on a building in [state], Australia, and want to check its weatherproofing against the NCC 2025 Deemed-to-Satisfy Provisions.
Project: [building class, e.g. Class 2 apartments or Class 1 house], [storeys], [wall cladding systems], [roof covering], [window type, e.g. AS 2047-rated or site-built], [balconies or podiums yes/no], [stage, e.g. design development or building permit].
Using NCC 2025 Volume One Part F1 (F1D6, F1D7, F1D12 to F1D15) or Volume Two Part H2 (H2D6 to H2D8), and the information at https://www.makao.com.au/services/building-performance/weatherproofing-assessment, please:
1. Tell me which elements are likely to follow the Deemed-to-Satisfy Provisions and which may fall outside them.
2. List the junctions most likely to need detailed review.
3. List the drawings and product information a consultant would need from me.
4. Suggest questions to ask my building surveyor.
Flag anything you're unsure of and tell me to confirm it with a qualified consultant and my building surveyor or certifier.
