As we seek to increase the comfort and energy efficiency of our buildings by installing higher amounts of insulation, thinking about airtightness is great because airtightness has a disproportionate effect on heat loss and the optimization of the insulation. But thinking about increased amounts of insulation and airtightness without properly considering moisture in the assembly is dangerous – paying attention to the control of this moisture is absolutely crucial for the structure and durability of the assembly.
Very quickly, we can become confused by where we should put our air barrier, and whether we need one or two – same goes for the vapor control layer. This week we received a question from a Tiny House builder in upstate New York, and wanted to share with you our response to his question.
So, if there’s one vapor permeable air barrier on the inside, there doesn’t need to be one on the outside? Could you reverse that, and put the vapor permeable air barrier on the outside (like with SOLITEX MENTO, a liquid applied product, etc.) and then go without the INTELLO on the interior?
Some perspective on what might work for you, dear Reader:
Remember, your climate affects your optimal wall assembly. Have a question about whether the solutions suggested are right for you? Contact the experts at 475 for help on designing an assembly – for any building size – which will minimize the risk of moisture damage while providing excellent levels of comfort and energy efficiency.
Thanks for reading, keep in touch!
To read the other posts in our Question of the Week series, click here.
**Please note that in republishing our question of the week, we sometimes edit the text of the original question and response in order to provide additional clarity to the issue.**