Weathertightness & building reports including management of leaky building claims.

We can provide you with a weathertightness and building report. Our professional background is in law, accounting, leaky building remediation, & construction. Meaning we can facilitate solutions strategically, then plan and implement.

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weathertightness

Building Code E1 Surface Water

This clause requires not only buildings but also the site to be constructed to make sure that there is protection from the adverse effects of surface water.

E1 of the Building Code sets out performance requirements to ensure drainage systems are in place for proper disposal of surface water (rain water) often using gravity where ever possible, making certain to avoid blockages and leakage.

E2 requires that buildings are constructed with proper resistance to penetration by moisture, and the accumulation of, moisture from the exterior.

With E2 the Building Code strictly specifies for roofs, wall claddings and external openings in order to:

  • prevent water entry
  • prevent water absorption and transmission
  • prevent the accumulation of water
  • allow for dissipation.  

This clause of the Building Code applies almost all buildings, as set out in the limit on application in E2.2.

The design specification to achive an acceptable standard of E2 under the Builing Code is E2/AS1. It is widely used for weathertight design. 

Building Code E2 External Moisture

Building Code E2 External Moisture

E2 requires that buildings are constructed with proper resistance to penetration by moisture, and the accumulation of, moisture from the exterior.

With E2 the Building Code strictly specifies for roofs, wall claddings and external openings in order to:

  • prevent water entry
  • prevent water absorption and transmission
  • prevent the accumulation of water
  • allow for dissipation.  

This clause of the Building Code applies almost all buildings, as set out in the limit on application in E2.2.

The design specification to achieve an acceptable standard of E2 under the Building Code is E2/AS1. It is widely used for weathertight design. 

About E2/AS1 

Scope of E2/AS1 is closely aligned to NZS 3604.  It is limited to timber-framed buildings up to three levels, with the building reaching a maximum height from the ground to the highest point of the roof of 10m.

E2/AS1 sets out design solutions for the external envelope of the building utilising building materials appropriate to New Zealand’s climate and conditions. 

Generally majority of leaks are found with junctions within, where there has been water penetrations through the building envelope. It is now a well known fact that in New Zealand serious problems are associated with building claddings that have failed drainage systems within the cladding system allowing water to drain and dry out.

E2/AS1 aims to address weathertightness problems in two ways:

  • providing details for common junctions and penetrations of the building envelope
  • classifying buildings by their weathertightness risk, and requiring particular cladding solutions depending on the risk score.

When issuing Building Consents Local Authority Bodies use E2/AS1 as their benchmark for low rise buildings when assessing alternative solutions or specific designs for compliance with Building Code clause E2.  This makes it a useful foundation document when preparing your building consent application.

Building Code E3 Internal Moisture

Under the Building Code clause E3 requires that buildings are constructed avoiding fungal growth and excessive moisture.  E3 Building Code provisions are all about habitable spaces, bathrooms, laundries and other spaces where moisture may be generated or accumulate. 

Requirements to consider when designing in line with E3:

  • adequate thermal resistance
  • space temperature
  • ventilation
  • disposal of overflow water
  • surfaces to be impervious and easily cleaned.  

Drainage Paths in Cladding System

Drainage paths within a building system use gravity to move water that has leaked into the wall cavity back out on to the exterior of the building. Drainage paths are on the back surface of the wall cladding, particularly within a drained and vented cavity assembly or in the space between the back face of the cladding and the face of the wall underlay in a direct-fixed cladding system.  

When remediating or designing it is important to keep in mind that the building exterior also provides a drainage path for water run off and this water also needs to be deflected away from critical junctions.

Direct-fixed cladding systems are generally less effective in drainage as the back of the cladding system has a high surface area of contact with the wall underlay, limiting the space for drainage down the back of the cladding.

Strategic management of complex weathertightness issues including providing you with building reports.

We understand that you are stressed and under significant pressure due to your building leaking, flooding or cracking. Which is why we will provide you with a comprehensive investigation, followed by a detailed building report showing you where and why your building is leaking.

Then, we partner with our sister company Zenith who are specialist on leaky building remediation. We provide you with remediation and repair proposal, along with estimated costs to remediate the weathertightness defects and damage. It will also include a long term management plan on how to prevent future damage

We will guide you through the weathertightness investigation process of your leaky building step by step. We can further assist with management of any leaky building claims.

Our team have a a very diverse professional background allowing us to implement strategy to prioritise the remediation project as well as assist you with any leaky building claim, funding or lending requirements.

COMPLEX WEATHERTIGHTNESS PROBLEM BUILDINGS PROFESSIONALLY RESOLVED.

Complex projects of weathertightness building reports

Weathertightness report can include (as appropriate):

  • Detailed overview of the buildings construction.
  • inspection and moisture testing of the building envelope.
  • Thermal imaging if appropriate.
  • Identify all areas of high risk and is a priority to managing remediation project.
  • Moisture testing of the building as a whole.
  • Detailed written report of findings, solutions and priority based time-line.
  • Written report will include photographs or video as appropriate.
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