insulation extruded Polysteyrene vs extruded polyethylene

[dubs chops]

For my aluminum camper I will be gluing the insulation directly to the skin on the inside and then gluing a laminate over the insulation for the finished interior. Has anyone use the closed cell polyethylene product as an insulation layer? It seems like i'd have way less chance of it de-laminating over time causing my interior paneling to droop. i have handled both and the polyethelene seems more like the plastic a straw is made from vs the polystyrene being like a Styrofoam cup.

Stratocell S - Foam Products - EVERYDAY PRODUCTS

Default Description

www.centralplastic.com

Owens Corning FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing-20WE - The Home Depot

FOAMULAR Extruded Polystyrene (XPS) Rigid Foam Insulation offers a comprehensive line of products - choose the strength you need, from 15 to 60 PSI and exceptional moisture resistance. Products provide

www.homedepot.com

 

[Alloy]

Where have you seen PE foam used in a building application?

 

[SquirrelZ]

Polyethylene is not typically used for insulation. Here's a list of common uses on the Foam Factory website (https://www.foambymail.com/polyethylene-foam.html):

Applications of Polyethylene Foam

• Packaging for heavier items, such as machinery and automotive parts
• Transport of sensitive electronics
• Padding and shock-absorption
• Masonry and concrete
• Personal flotation
• Arts and crafts

As your link shows, XPS is designed for use as an insulation. There are plenty of adhesives that work with XPS. Both the XPS foam and adhesives are readily available at the big box building stores, which will save you $$$.

 

[john61ct]

No need to glue the foam itself.

There are foam panel hangers specialist designed to hold forever. Already adhesive-backed or use your own maybe higher strength, say VHB tape.

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Your headliner / ceiling panel should be suspended from your load-bearing cross-beams, not from the foam panels.

 

[WandaVerne]

I'd recommend insulation extruded polystyrene.

 

[WVI]

jpjn61ct, thanks for the link! I'd given up on foam bard as I couldn't find a source. Even the AC companies around me no longer use them.
I do worry about using them in a vehicle roof do to summer temps in some areas.

 

[dubs chops]

Where have you seen PE foam used in a building application?

I haven't. However it is closed cell and has thousands of tiny air bubles per sq in" I thought its R value would be decent. I still believe it would. However due to the difficulty in gluing to PolyE I think I may stick to PolyS. I just hope it does not de-laminate over time since my internal skin will be help directly by the contact to the board. I will still be trimming the edges so it will be held there as well. I just don't want any droops sags etc,,,

 

[john61ct]

We need more details

I'd given up on foam bard as I couldn't find a source.

Well unless you do it all with 2-part spray, or pay a pro as a side job, that really is what you need, do what it takes

unless you plan to just follow the 60's.


> I do worry about using them in a vehicle roof do to summer temps in some areas

I don't follow. Are you going to put in aircon?

Also camping in snow?

If you're traveling anyway, just head to an area where foam is common and do your buildout there.

 

[dubs chops]

We need more details

Well unless you do it all with 2-part spray, or pay a pro as a side job, that really is what you need, do what it takes

unless you plan to just follow the 60's.


> I do worry about using them in a vehicle roof do to summer temps in some areas

I don't follow. Are you going to put in aircon?

Also camping in snow?

If you're traveling anyway, just head to an area where foam is common and do your buildout there.

Huh? None of that was me, the OP