CONDENSATION Causes & Mitigation

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Presentation transcript:

CONDENSATION Causes & Mitigation Consumer, Building and Occupational Services Department of Justice

Main topics: Research by UTAS on condensation in Tasmania: Causes Tasmanian issues Strategies Regulatory changes Our new Guide on minimising condensation

Initial research (2014) Three case study homes One newly built home had condensation issues within 6 weeks of occupation Key causes identified: Lack of ventilation Sarking touching cold roofing materials Key problems: Health problems Structural issues

Follow up Designer’s Guide: Condensation in Buildings (available on CBOS website) ABCB commissioned scoping study on extent of problem. This highlighted: Nationwide concern about condensation Significant gaps in regulation compared to other countries

Most recent research (2017) Reviewed overseas literature and regulations Reviewed international standards for roof space ventilation Simulated & analysed condensation risk in typical external wall systems

Condensation problem Vapour impermeable external wall materials High outward water vapour flow (cold climates) Thermal bridging Air tight buildings (energy efficiency, bushfire protection requirements)

External walls: strategies Vapour permeable building membranes Ventilated cavity between building membrane & cladding In cool climates: second vapour control membrane may be required

Roof spaces: ventilation

National Construction Code 2016 Currently no performance requirements to minimise condensation in NCC Lagging behind other countries ABCB scoping study highlighted condensation major issue Led to proposal to change to NCC in 2019 Public Comment Draft

National Construction Code 2019 See: Part F6 Volume One, Part 3.8.7 Volume Two Class 1, 2 and 4 buildings DtS provisions on: Water control membranes Roof space ventilation Externally vented exhaust systems

Our new Guide (coming soon) Practical tips & diagrams on how to reduce condensation Aimed at wide audience Key messages: Vapour permeable building membranes (installed to minimise air leakage) Externally vented rangehoods & exhausts Vapour permeable building fabrics Ventilation in subfloor, walls, roof space

Roof space best practice

Roof space ventilation: supply

Roof space ventilation: exhaust

Continuous gap vents

Wall cavity ventilation

Subfloor ventilation

More building information: Consumer, Building and Occupational Services New Website address: www.cbos.tas.gov.au New Online Enquiry Form (on CBOS website) New e-mail address: CBOS.info@justice.tas.gov.au Facebook page: www.facebook.com/TasBuildingStandards