Managing Condensation in Construction - A presentation from 2014 and the fight continues.

Mark Pohlner is a seasoned professional, who has been presenting on this topic for a very long time. This video represents a look back at the past, and the message hasn't changed much, but have we changed?
Managing condensation in construction is crucial for maintaining the integrity and longevity of a building. The use of plastic/foil sarking and understanding the importance of vapour permeability are critical factors in this process.
Plastic/foil sarking, a vapour barrier or reflective insulation, was and still is often installed in roofs and walls to control moisture transfer. It acts as a barrier to prevent the movement of water vapour from the interior of the building to the colder areas, such as the outside.
However, while plastic/foil sarking effectively reduces condensation, it is equally important to consider the vapour permeability of the construction materials. Vapor permeability refers to the ability of a material to allow moisture vapour to pass through it. This is important because a completely impermeable barrier can trap moisture within the building envelope, leading to mould growth and structural damage.
To manage condensation effectively, balancing the use of plastic/foil sarking and vapour-permeable materials is essential. Using materials with appropriate vapour permeability levels allows moisture trapped within the building to escape, preventing condensation-related problems.
It is recommended to consult with building professionals or specialists to determine the best combination of materials and design strategies for managing condensation in construction. Additionally, following local building codes and guidelines is essential to properly install and maintain vapour barriers and permeable materials.
If you have any specific questions or need further information, feel free to ask!
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[@CarlosAcuna970]

Mark - Fantastic presentation! Very easy to understand! Great photos and examples!

[@Len02013]

Thanks. Great presentation :)

[@nathanwooldridge85]

Another info packed video - thanks.
Question if I may - I am just about to start a new build 8.1 stars single storey house in inner west melb - beachside suburb. Vapour permeable building wrap, anticon blanket, R2.5 wall insulation, R6 ceiling insulation, rangehood and bathroom extraction to outside and uPVC double glazing. I am being pressured by builder to install whirlybird and even the energy assessor has raised concerns about condensation issues by not installing a whilybird. Am I correct in refusing the necessity?
Thanks

[@ecoevo]

Whirly birds to not move sufficient air to make enough of a difference to condensation. A roof ridge vent is way more effective.
efficiencymatrix.com/does-roof-ventilation-work/

[@EH-mh4it]

This may be a dumb question, but how does this relate to sub tropical Brisbane (proposed build is steel roof, with mix of brick veneer and lightweight cladding)? Does higher temperature reduce condensation? But then does higher humidity increase condensation? What is the solution for higher temp and high humidity? Blanket under steel roof, and permeable wrap on wall? Extra ventilation in roof space?

[@ecoevo]

Brisbane can still get away with a vapour barrier on the inside, but North of Brisbane, the vapour barrier goes on the outside. And foil can be used as a vapour barrier, but it must be installed airtight. Any moisture that gets inside a wall system will condense on cold plaster surfaces, that are being cooled by air conditioners.

[@KJSvitko]

Every home and business should install a rain water collection and storage system along with solar panels.
Even in areas where rain is infrequent it is crazy to waste the little rain that does fall and waste it.
We need to stop planting green lawns and switch to local native plantings around homes.
It is crazy to plant lawns and build golf courses in dry desert areas. We waste too much water and electricity.

[@KJSvitko]

An energy efficient home or business is more comfortable and saves money in the long run.
Solar energy on your roof combined with battery storage can make people more independent from the grid and natural gas supplies. Add solar and supplemental electric heating or a heat pump for home heating..
Added insulation, triple glaze windows, energy efficient doors, energy efficient heating and cooling systems, energy efficient appliances, LED lighting, smart thermostats, solar panels combined with battery storage and a electric vehicle charger in the garage or car park. People are too focused on the short term costs and miss out on long term savings and comfort. Blower door testing and air sealing are under appreciated tools.Even if you have money to burn you should not waste it. Climate Change will impact everyone. Leave a better future for your children and grandchildren. Join in and speak up for the future of the planet.

[@JamPackedJack]

Are there any tips or videos for retrofitting insulation in old houses (60's, 70's) where you may not be doing a full redesign? E.g. Putting insulation batts in brick veneer walls?

[@ecoevo]

You need to ensure your insulation is not in contact with your brick. There are also companies that do blow in aqua-phobic insulation out there.

[@JamPackedJack]

@@ecoevo ah great! I’ve heard it’s important with spray foam to pick the right installer, is there any you’d recommend in Melbourne or tips to find ones that will do it properly?

[@timspink6887]

Very good presentation thanks for sharing!
I have a roofer booked in a couple of weeks to change my tile roof to colorbond. Taking the opportunity to add batts to cathedral roof sections. 100mm rafters with R2.5 batts, 40mm top hat battens and 55mm R1.3 anticon. Melbourne SE suburb.
Any advice or concerns with this plan? Thanks heaps!