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I can speak from experience, that insulation which forms a vapor barrier is not compliant with the residential building codes in Austin, TX and likely many othe
by pnut 6y ago
I can speak from experience, that insulation which forms a vapor barrier is not compliant with the residential building codes in Austin, TX and likely many other places due to the climate of the area.
Additionally, in the UK, many houses had this spray insulation inserted into their wall cavities, and the additional vapor barrier resulted in major damp and mold problems.
- hourislate 6y agoIn warmer climates like Austin/TX, you use 1/2 lb (Open Cell) to a depth of 6 inches. It does not create a vapor barrier. It's all about warm side/cold side and the dew point. Demilic is based in Arlington TX.
- justnotworthit 6y agoto further geek out: * If air temp will never cross the dew point, you don't need a vapor retarder. * Though the normal is "vapor retarder on the hot side", they can be on the outside of the wall assembly if condensed water can drain away. This is important for climates that have heavy heating and heavy cooling seasons, or for it's easier to put it on the outside.