Anyone have experience with underlayment?

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Anyone have experience with underlayment?

Postby Schantzfamily2014 » Sun Mar 20, 2016 4:35 pm

Hello, I'm building a teardrop on a HF trailer. I was wondering if anyone has used underlayment as the exterior, and then covering it with PMF. I know it would help keep the weight down versus using plywood. If anyone has any input I'd greatly appreciate it.
Thanks in advance,
Daniel
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Re: Anyone have experience with underlayment?

Postby tony.latham » Sun Mar 20, 2016 5:16 pm

I use 1/4" (5.5mm) plywood underlayment to sheath the inside and outside of sandwiched walls. Is that what you're talking about?

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Just Googling underlayment, I get this: https://www.google.com/webhp?sourceid=c ... derlayment I see they make all sorts of stuff that they label with the word, underlayment. :thinking:

Tony
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Re: Anyone have experience with underlayment?

Postby Schantzfamily2014 » Sun Mar 20, 2016 5:40 pm

Yes, Tony, the plywood underlayment is what I have. I'm fairly sure it's the 1/4". I'm guessing it's safe to assume that it is sturdy enough if you're using it on the outside. Do you know if the PMF will work on it?
Daniel
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Re: Anyone have experience with underlayment?

Postby tony.latham » Sun Mar 20, 2016 7:04 pm

Schantzfamily2014 wrote:Yes, Tony, the plywood underlayment is what I have. I'm fairly sure it's the 1/4". I'm guessing it's safe to assume that it is sturdy enough if you're using it on the outside. Do you know if the PMF will work on it?
Daniel


The PMF should be just fine. However, if it's the 1/4" stuff, you'll need some kind of framing. It's just too thin.

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The underlayment I get is cheaper and superior to 1/4" AC ply. I've thrown a scrap in a bucket and it doesn't delaminate.

Tony
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Re: Anyone have experience with underlayment?

Postby lrrowe » Sun Mar 20, 2016 7:32 pm

I am basically using underlaminet from Lowes in my CT interior. It stains well. Now if I was good at applying stains, the results would be better. But I have no patience for these tasks.

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Re: Anyone have experience with underlayment?

Postby Tomterrific » Sun Mar 20, 2016 9:42 pm

The stuff I used was even thinner than 1/4"! Of course it was floppy until I installed vertical battens. Hauled furniture, motorcycles and a 1300 mile camping trip. The foundation is stiff and the joints are reenforced with cleats. So sure, you can use 1/4" walls if it's made correctly.
T
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Re: Anyone have experience with underlayment?

Postby Schantzfamily2014 » Tue Mar 22, 2016 3:34 pm

My next question is: If I use the underlayment wood, with a plywood inner frame for support, should I just glue the underlayment wood to the plywood? Or should I screw it in?
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Re: Anyone have experience with underlayment?

Postby Tomterrific » Tue Mar 22, 2016 4:13 pm

I glued on the exterior battens but used small screws to hold the batten until the glue set.
T
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Re: Anyone have experience with underlayment?

Postby dales133 » Tue Mar 22, 2016 4:40 pm

I used 3mm hardwood ply on the exterior of mine with pmf over it and as its laminated to the foam and frame underneath its solid as a rock.
Ive got 6mm ply on the interior.
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Re: Anyone have experience with underlayment?

Postby rowerwet » Thu Mar 24, 2016 12:04 pm

The tear in my avatar is sureply underlayment with PMF. All joints are glued with the screws removed after the glue cured.
I used 1x2 framing and filled the voids with foam.
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Re: Anyone have experience with underlayment?

Postby Schantzfamily2014 » Thu Mar 24, 2016 4:12 pm

rowerwet wrote:The tear in my avatar is sureply underlayment with PMF. All joints are glued with the screws removed after the glue cured.
I used 1x2 framing and filled the voids with foam.


Did you bondo over the screw holes before doing the PMF? Thanks for all of the information.
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Re: Anyone have experience with underlayment?

Postby rowerwet » Fri Mar 25, 2016 6:02 pm

I filled the screw holes with PLpremium, then sanded it smooth when cured.
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