The Ultimate Guide of XPS Foam Board

The Ultimate Guide of XPS Foam Board

XPS (Extruded Polystyrene) foam board is a versatile building material with a wide range of applications, known for its insulation properties and durability. Whether you're a DIY enthusiast or a construction professional, this comprehensive guide will provide valuable insights into the features, uses, and benefits of XPS foam boards.

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1. What is XPS Foam Board?

XPS foam board is a rigid insulation board made from polystyrene resin through an extrusion process. It is known for its closed-cell structure, providing excellent thermal insulation. The manufacturing process results in a lightweight, moisture-resistant, and durable material suitable for various construction and insulation applications.

2. Key Features of XPS Foam Board

Understanding the key features of XPS foam board is crucial for its effective use. These features include high thermal resistance (R-value), resistance to moisture absorption, low weight, and dimensional stability. Additionally, XPS foam boards have high compressive strength, making them suitable for load-bearing applications.

3. Common Applications

XPS foam boards find applications in both residential and commercial construction. Common uses include insulation for walls, roofs, and floors, as well as in the creation of model scenery, signage, and craft projects. The material's versatility and ease of cutting make it a favorite among builders and DIY enthusiasts alike.

XPS Foam Boards

4. Installation Tips

Proper installation is crucial for maximizing the benefits of XPS foam board. Ensure a clean and dry surface before applying adhesive for secure attachment. Pay attention to joints and seams to maintain a continuous insulation barrier. Use compatible materials for sealing gaps and edges to enhance the overall insulation performance.

5. Advantages of XPS Foam Board

XPS foam boards offer several advantages, including high thermal efficiency, moisture resistance, and resistance to mold and mildew. Their lightweight nature facilitates easy handling and installation. The material's durability ensures long-term performance, making it a cost-effective choice for various construction projects.

Are you interested in learning more about XPS foam board production plant? Contact us today to secure an expert consultation!

Frequently Asked Questions

Q: Can XPS foam boards be used for outdoor applications?

A: Yes, XPS foam boards are suitable for outdoor applications. They are resistant to moisture and provide effective insulation for exterior walls, roofs, and foundations.

XPS Foam Boards

Q: Can XPS foam boards be cut to specific sizes?

A: Yes, XPS foam boards can be easily cut to specific sizes using a utility knife or a saw. This flexibility makes them adaptable to various construction needs.

Q: Is XPS foam board environmentally friendly?

A: XPS foam board is not biodegradable but can be recycled. Check with local recycling facilities to ensure proper disposal and recycling of the material.

Armed with knowledge about the features, applications, and advantages of XPS foam boards, you can confidently integrate this versatile material into your construction projects, ensuring energy-efficient and durable results.

Kendall Cold Chain System XPS Foam Board or Extruded Polystyrene Foam Board is the end product of polystyrene resin, raw materials, polymers, and catalyst which are heated and mixed simultaneously. Then extrusion and molding of this mixture are cooled into a rigid foam plastic board. They exhibit remarkable features such as low water absorption, low thermal conductivity, high compressive resistance, and no aging these attributes make it extremely appealing in the market.

If you want to learn more, please visit our website xps extrusion line.

This topic has popped up here and elsewhere repeatedly, with the same objections repeated again and again, some I feel are valid, others less so. As a sandwich core "peel strength" is not the issue...... Nobody is going to grab some overhanging end and try to peel the glass away from the foam. Shear strength IS the issue. A sandwich construction requires the core to operate as a sheer web between two load bearing faces. The bond matters in shear. The foam itself is quite strong but will fail when bent beyond it's elastic limit....... but so will Divinicell. By the time you reach that limit, you have deformed it far beyond what it will experience in real world application short of a major wreck, where most materials will have failed also.

A foam core sandwich operates like an I beam. The surfaces carry the loads in compression and tension, the foam joins those two surfaces in shear so that they work as a uniform beam or panel.

I propose a couple of possible ways to enhance the connection between the two surfaces beyond just the strength of the foam. My favorite is to puncture the foam in a grid with a device similar to a gang of sewing awls, each needle carrying strands of fiberglass thread, the tails of which would extend such that they will lay beneath the glass when it is applied. In experiments using an ordinary sewing awl this stops peel entirely..... again, peel is not a real world scenario. The pieces I've made fail in buckling on the compression side... the foam will wrinkle and the glass will delaminate, but this is with extreme bending and thin glass skins.
Proposal 2 is to use planks edge bonded together, with glassed edges, which essentially act as stringers. This could be done easily and fairly quickly by ripping the foam planks out of 4x8 sheets, lining them up edge up on a table with cardboard spacers, and applying glass on the bias, then cutting them apart living a small scrim of glass fiber (without resin) to join the surface plies of glass. This would give you a very positive connection between the two faces when assembled.

The low cost for very thick foam makes this an attractive core material. It will yield a very stiff structure because of the thickness.. 1" is the thinnest I can find locally. The insulation value of thick foam core for both thermal and sound would be of great value IMHO.

It is strong in compression if distributed....... it does not take point loads well. This can be mitigated as others have by applying a thin ply layer, or simply adding a layer glass mat, and or more layers of fabric where actually needed.

I'm hoping to begin a "small" boat project... 18' tri.... this winter, and utilize blue XPS as the main material. I would not do this if I didn't think it would work. I've built fiberglass XPS sandwich projects in the past, though small.

The objections I have read, are all the same, and virtually none seem based on actual use..... pretty much hearsay.

H.W.

Curious to see it done.

Bill Schwabe of Lightning Yachts told me once that they found peel strength with XPS to be basically equivalent to Divinycell and that the paddle boards his employees made from it held up well, but obviously they'd never use it as structural core in one of their boats.

Of course, if you paid Lightning Yachts money for a boat and discovered they'd put XPS in the hull, that would probably be the end of Lightning Yachts. But he thought it was not worth the savings for most applications given what could be done with plywood and considering the percentage of the budget the core makes up. Still, he wasn't nearly as dismissive of the concept as I would have guessed, and it's not like he doesn't have a hundred times as much experience as any amateur builder, that's for sure, and specifically focuses on light weight composite construction. If anyone would know, you'd have to figure it'd be him.

That's pretty interesting....... What I hear most of the time is stuff like "XPS has no place in boat building", "it isn't construction foam", and various ignorant statements to that effect and similar. One of the big drivers of this is the confusion between XPS and EPS, both polystyrene, but very different. EPS is the stuff garbage products like throw away food containers and coolers is made of. It is thermally expanded beads done in a mold. XPS is the closed cell extruded product, generally found in blue or pink, far stiffer, and far stronger.
The peel strength comment was very interesting..... but again I don't consider peel strength a huge issue considering the usage. One surfboard builder on this forum I think, advocated sanding with 20G sandpaper to scar and pit the surface, and I've read other similar advice. Most of this boat cost will be core, glass, and epoxy. With ply construction I could get away with polyester resin as this boat will not spend much of it's life in the water... it'll be in the water when being sailed, otherwise it will be on a trailer. The thickness of the core will result in very stiff hull sides and bottom, which means no stringers needed, and fewer bulkheads. Wood will be used in a few strategic places.
I'm an aviation guy from way back, and admired the work of Burt Rutan who designed his EZ series aircraft with XPS foam core wings. Designed in the early '80's, I have yet to hear of a failure.

H.W.

Owly, you don't know nothing.
An important material property for foam core is shear stiffness - as opposed to strength.

I one time made a XPS sandwich with glass/ epoxy skins and measured the deflection.
It was very little better than 2 separate skins of glass bent together.

A sandwich with a boat building foam (can't remember which) had 1/4 or less deflection.

If you are willing to have your boat hull deflect a great deal, then go ahead. Or if there is another load path to take the shear then OK.

The reason a surfboard works is that the strength and stiffness is in the outer skin. The skin on the sides takes the majority of the shear stiffness (and strength). The core in this case does very little for bending - but it does something of course.

You are right this keeps coming up. And you keep getting it wrong.

The only thing you have done with your idea of putting glass on the edges of core is to reinvent glass honeycomb. Take out the foam and the product will be lighter.

Did you ever work with Rutan? I did.

Sadly, the xps thing keeps coming up because people still fantasize about its capabilities.

The 'stuff' has 2 main problems and a third process limit.

1. Low shear strength. There are higher density xps foams available that will work better. This, btw, is also the peel problem. Unless Rutan published the shear ratings of the xps he was using; we need to be very careful because it is possible the industry reduced the density of xps since Rutan's famous video. Also, a caution, Rutan's work was not on thin cores iirc. A thin section of xps will delam far faster than a thick one in any dynamic setting. This idea can be used in boat building a bit.

2. Low compressability. This is a problem for certain applications. Especially underfoot. Stomp on a piece of it and see what happens. Bump it against a dock and it will smash easily. Then, for any vessels traveling at speeds, hydraulics will take over.

3. For manufacturing, how it behaves with esters. Melting is not worth the trouble.

All that said, xps has a great place on boats.

It is an excellent insulator and has low water absorption.

It works great for amas.

It can probably be used as a core between ply panels well. Not going down that rabbit hole.

Inside the boat; there are certainly places it could work. A bulkhead, for example. Another rabbit hole.

I am the person who recommended scuffing the surface for use as amas. The reasoning is simple. If you make more surface area, the shear strength improves and the bond, done correctly, does as well. But in order to advantage a rougher surface, the surfsce must be puttied or hot coated before glasswork. Otherwise, glass standing on high ridges of xps are even easier to shear away. This also thickens the glass shell and makes it harder to compress.

As for creating a shear web, fine. Do it. But I'd still want to use a better xps foam, higher density, lower compressability, higher shear strength. Unless you are insulating a cooler or a ceiling or building amas.

In the case of amas, the xps is really only a mould. It you run it into a tree; you will be fixing it.

Xps is unfriendly on the table saw, be careful ripping it. It loves to skate off sideways...lots of experience avoiding sawing it!!

As for the strip building with it...I think it sounds like a hell of a lot of work to develop an inferior hull. Yes. Inferior. The savings on the hull will be about say 100$ per 32sqft. For an 18' hull, I see about $600 savings or a grand. So, for me not worth it.

pay some attention to the critics..I tried to bond a piece of to unprepared (no rough sand) xps (2'x3') and it peeled off easier than paper backing on a sticker..In fact, I used peelply, and pulling the peelply delaminated the edges, so I had to pull test the other side even. If the product can't withstand peelply; that ought to tell you a thing or two.

Here are some variations on xps that highlight differences among 'highload' types. Standard xps pink has a compression rating of 30 psi only.


https://www.dupont.com/content/dam/...e-Building-Solutions/literature/179-.pdf

"don't know nothing"??? No I can't claim to have worked with Burt Rutan...... though I did attend one of his workshops where we built a wing. The core material was 2 lb XPS foam........ Obvious in your opinion a grossly inadequate core. We hot wired it to shape, laid unidirectional fiber down the groove for the spar structure, etc. Obviously you know something I don't...... Perhaps a series of wing failures and crashes I have yet to hear about... perhaps airworthiness directives? Lawsuits? The ONLY structural failure I know of was a quickie........ which has the landing gear at the tips of the canard which was landed so hard it failed the canard wing.

All your dire warnings seem to conflict with what I've seen and with the results of tests I've done over the last few years...... It's interesting that even daring to suggest use in a small boat results in a veritable dog pile which I find interesting............ though really not very informative. Nowhere on the internet have I found and account of someone who actually ignored all these dire warnings and did it.......... and had it fail.... not even an umpteenth removed account..."My drinking buddy's former brother in law's co-worker's uncle's cousin 4 th removed tried it and his boat broke up in rough water and he drowned according to a Gypsy woman who contacted his spirit in a seance..."

H.W.