Wall / sides construction

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Re: Wall / sides construction

Postby CBO » Mon Mar 19, 2018 1:34 pm

Why not 3/4 plywood with a thin carpet material glued on the interior walls? Wouldn't that be enough to ward off condensation?
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Re: Wall / sides construction

Postby greygoos » Mon Mar 19, 2018 3:28 pm

Taking the lead from a builder on here who has completed more than 150 teardrops I used 1/2 ply on my last build and covered the interior with carpeting. I didnt have the camper for long, but never had any condensation problems. I guess it is your own preference and the climate you live in.
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Re: Wall / sides construction

Postby Ottsville » Tue May 08, 2018 7:44 am

CBO wrote:Why not 3/4 plywood with a thin carpet material glued on the interior walls? Wouldn't that be enough to ward off condensation?


I like carpet; it's a simple solution to provide a minimum of insulation and a good bit of sound deadening. However moisture is still gets in the air, and most likely you just won't see it on the walls as the carpet will hold and disperse it. I would think that long term, this would eventually lead to moisture related issues in the wood and carpet.
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Re: Wall / sides construction

Postby Andrew Herrick » Wed May 09, 2018 1:16 am

Ottsville wrote:
CBO wrote:Why not 3/4 plywood with a thin carpet material glued on the interior walls? Wouldn't that be enough to ward off condensation?


I like carpet; it's a simple solution to provide a minimum of insulation and a good bit of sound deadening. However moisture is still gets in the air, and most likely you just won't see it on the walls as the carpet will hold and disperse it. I would think that long term, this would eventually lead to moisture related issues in the wood and carpet.


You've hit upon the key distinction. Carpet doesn't have much insulation value. It adds R 0.25 - 0.5 (assuming minimal or no padding). In an absolute sense, it's not much, but in a relative sense, it might decrease the heat transfer of a solid plywood wall by 20-50%, which is fairly significant.

However, carpet has so much surface area that any condensation short of a tropical rainforest gets captured in the fibers, where it dampens the carpet (just a bit) and waits for dryer weather to evaporate. Manufacturers (Scamp rat fur?) have been putting carpet on the walls for 30+ years with minimal mildew issues. Just use the right carpet :)

P.S. Not to discourage the use of bubble foil insulation, but don't accept the stated R-values as valid for conductive heat transfer (no air space). They aren't accurate at all.
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Re: Wall / sides construction

Postby Ottsville » Wed May 09, 2018 6:10 am

Totally agree with you Andrew about using the right carpet. I have a piece of indoor/outdoor carpet(from home depot) on my shaded back porch in a high humidity area and no mildew issues in 10+ years. My concern would be putting carpet on bare or unsealed wood where the moisture captured in the carpet would pull through into the wood causing issues with the wood over time. Probably not an issue for those that live in desert areas, but for those in more humid/wet areas I would think that would be a problem long term.
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Re: Wall / sides construction

Postby MJWBuffalo » Wed Dec 04, 2019 9:10 am

I've been reading and lurking and soaking it all in. Something I haven't seen addressed that has to do with this topic....

When using 2x 's for the roof, how long of a span can you tackle on the 1.5" side? If I am going 6'w on my trailer should I be standing them up on end to give 3.5" of support? I will have 1/4' ply top and bottom (glued and screwed) with a single aluminum sheet covering as well as a 1.5" lip on the edge to glue/screw everything down to.

thanks for the help

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Re: Wall / sides construction

Postby Tomterrific » Wed Dec 04, 2019 9:55 am

Personal opinion: I see most builds as too heavy and overbuilt. Mine uses 5mm Revolution ply and 1x2's for battens and roof ribs. The failure point of our box is at the roof and floor side interface so I made that strong. Very light, no strength or condensation problems. Half inch walls are the most I would need on any small camper.

Tt

I'm going to add that I am not sold on the Revolution ply and suggest 1/4" exterior ply if going the lightweight route.
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Re: Wall / sides construction

Postby MJWBuffalo » Thu Feb 13, 2020 9:43 am

Tom,

I apologize for taking so long to respond to your post.

Due to the thickness (2"), weight and pneumatics of my awning windows, I ended up going with the double 3/4" plywood with 1/4" ply on either side. I did take the advice of pretty much everyone around here and lightened both sheets up significantly by removing unneeded material and replacing with foam insulation. I should weigh all the cuts to see how much I saved but it has to be over 60% lighter.

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