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Hypervent Alternative?


CRM
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I have some of this DMX-1 Step underlayment leftover from a flooring project and I'm thinking of installing it under the cushions in my Ollie. I'm fairly certain that it will allow more than enough airflow to prevent condensation under the cushions plus it is a moisture and thermal barrier too.  Additionally, it's much thinner than Hypervent and only costs around 70 cents per square foot. Any thoughts, pro or con? Seems to be a superior solution to me, but maybe I'm missing something?

https://dmx1step.com/

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2010 Elite II, Hull #45

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15 minutes ago, CRM said:

I have some of this DMX-1 Step underlayment leftover from a flooring project and I'm thinking of installing it under the cushions in my Ollie. I'm fairly certain that it will allow more than enough airflow to prevent condensation under the cushions plus it is a moisture and thermal barrier too.  Additionally, it's much thinner than Hypervent and only costs around 70 cents per square foot. Any thoughts, pro or con? Seems to be a superior solution to me, but maybe I'm missing something?

https://dmx1step.com/

We have the Hypervent that Oliver options however we used this in our Airstream and it worked great. 
 

https://www.tochta.com/product/hypur-flo-moisture-protection/

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2021 Dodge Ram 1500 

2021 Oliver Elite ll 

Hull #732 

Michigan 

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Well, got around to installing the DMX-1 Step underlayment and very happy with the results. Lays flat right from the roll and was easy to cut and fit.  About $30 worth of materials and (I think) it will perform better than Hypervent. Time will tell..

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304784455_432775375583194_3197267292110379141_n.jpg

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2010 Elite II, Hull #45

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It may work. Looking forward to your comments.  I just use heavy duty ikea shelf liner, but I have cushions with a mildewproof coating (krypton), not a mattress. 

I don't see a way for the moisture ( we all emit it, breathing and sweating, etc.) to move through the underlayment.  That's the beauty of hypervent, and similar.

With that liner, if you start to see moisture in the pockets beneath, I'd tip the mattress or cushions  up a bit daily to let it breathe.  That's what we do on the boat. No underlayment,  just painted plywood,  in Florida, but breathable mesh on the bottom of the cushions.

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2008 Ram 1500 4 × 4

2008 Oliver Elite, Hull #12

 

 

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24 minutes ago, SeaDawg said:

I don't see a way for the moisture ( we all emit it, breathing and sweating, etc.) to move through the underlayment.  That's the beauty of hypervent, and similar.

With that liner, if you start to see moisture in the pockets beneath, I'd tip the mattress or cushions  up a bit daily to let it breathe. 

The idea is that if moisture builds, it will form between the hull and the air gap on the bottom of the underlayment. The underlayment is a vapor barrier so that no moisture can penetrate through to the bottom of the cushions. I have a dehumidifier that is always on set at 50% or below so that should quickly remove any condensation that forms. If not, I'll add another section along the walls behind the upper cushions to increase airflow and give any moisture another route to escape.

This underlayment is also a thermal barrier so moisture shouldn't ever build in the top pockets. "Shouldn't",  we shall see..

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2010 Elite II, Hull #45

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Like I said, it may work just fine. We have nothing on our boat, and shelf liner in the trailer, but no dehumidifier.  So, we resort to lifting the cushions... always when in storage.

I'll look forward to your reports. 

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2008 Ram 1500 4 × 4

2008 Oliver Elite, Hull #12

 

 

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