IMPORTANT NOTICE - April 10, 2015  

Over the last year, gross sales declined as some popular thicknesses were sold out.  On the plus side, only three of the original 5 warehouses are still being rented. And there remains a sizable quantity of material to be sorted and added to the inventory page later this year. 

However my CPA just finalized my 2014 P&L statement and tax returns and I have no choice but to raise prices.  This year will be in the red if I don't.

On May 1st 2015, prices will increase approximately 15%.

Thank you for your business,

Dan V.

  • This material is in South-East IDAHO (83241) and shipping more than a few hundred miles gets quite expensive.    More than 1000 miles is totally uneconomical.

  • For INVENTORY and PRICES, click on the "INVENTORY & PRICES" link at the top of this page.


Energy prices have nowhere to go but UP.    And on a fixed income how am I supposed to keep my home and shop warm?    After considerable research I determined the best way to hedge against rising energy costs is to INSULATE THE HECK OUT OF MY HOUSE/SHOP before even the price of insulation goes sky-high (all foam insulation products are made from oil and other hydrocarbon sources).   What better way to stay comfortable using a small fraction of the energy otherwise required?   It's called SUPER-INSULATING and every homeowner should learn about it and act before $300.00+/barrel oil gets here. Just one cockup by Iran or North Korea or ________ and it will be too late. (fill in the blank with who you think it will be)

Additional research then led me to this type material since it has the highest and most stable R-Value-per-inch-of-thickness (R-6/inch) of any insulation material commonly available to commercial and residential builders.  See HERE and HERE for good discussions of insulation materials.  A standard 2x4" wall using the common pink or white fiberglass batting has an R-13 value.  With the Poly-Iso insulation, that same 2x4" wall becomes R-23, which is even higher than a 2x6" wall using fiberglass batting( R-19).   With Poly-Iso that 2x6" wall jumps to R-35.   And being in a lightweight, rigid sheet form which is easily cut to fit between framed walls and rafters and glued to concrete walls, I knew I could install it myself, saving additional money.

One bad thing:  The cost of new Poly-Iso is quite expensive.   So to get the best price I bought the entire inventory of “over-runs” and “seconds” Polyisocyanurate insulation material from a large insulation manufacturer to use in my house, shop, potato cellars, and other out-buildings here in South-East Idaho.  I had much more than I needed to finish my projects and sold off the surplus.  Up until February 2014 I had occasionally been able to buy additional material.  To keep the Idaho State Tax Commission happy I had to incorporate as Zinsulation, L.L.C. and collect Idaho sales tax on non-exempt sales.  "Uncle Iris" is now happy, too.

This material comes in 4 foot by 8 foot (4’X8’) or 4 foot by 4 foot (4'X4') rigid insulation sheets in many different thicknesses/R-Values.  Typical R-Value is about R-6 per inch of thickness.  It has 15-25% better insulation R-value per inch thickness than expanded/extruded polystyrene or other similar materials found at the big-box home improvement stores.  (See the Product/Pricing Info page for more details).

If you don’t find the exact thickness material you want, the same R-Value is achieved by using multiple layers of thinner sheets.  And the cost is exactly the same since the material is priced by the cubic foot- not square footage.  So, for example, you want to fill the 3.5” void between 2X4 wall studs, you can stack two 1.5” sheets along with a ½” sheet to completely fill that 3.5” cavity while having a R-23 insulation value- the same as a single 3.5” sheet would provide.

This material is useful for insulating: homes, basements, shops, overhead doors, trailers, metal buildings, wood frame or concrete buildings, concrete floors/walls, greenhouses, animal shelter/barns, water pump/tank/well enclosures, and many other spaces where the highest R-Value-per-inch-thickness is desired (See the Picture Gallery page for more details and installation ideas)


As with most insulation materials, this material IS NOT FIREPROOF and thus must be transported, stored, handled, and installed using proper safety measures.  See Warranty Disclaimer page for more information on safety and building code requirements.

Material is purchased by the bunk.   A "bunk" is a cubic volume bundle of material that measures 4'x4'x8' in size.  The number of sheets in a bunk is determined by the sheet thickness.  Since a bunk should be 48" (4') in height, only enough sheets are stacked up to get as close to that height - rounding as needed.  Thus a bunk of 1" sheets would be stacked 48 sheets high.  Please see Product/Pricing Info page for price breaks/quantity discounts.  But no matter how much you purchase, the price-per-sheet will be less than half of what the home improvement stores charge for equivalent products.

The square-footage per bunk will vary depending on the thickness/number of sheets in the bunk.  Individual bunks contain one material size and thickness only.  Refer to the table in the Product/Pricing Info page for number of sheets and square footage per bunk data.

These insulation sheets consist of a closed-cell polyisocyanurate foam core with dark-brown, glass-reinforced mat facers laminated to both sides.  This facer material is much like a heavy-duty version of the construction-paper your teacher gave you in Elementary School to cut into shapes for art projects.  This makes for a rigid, lightweight sheet that typically exhibits standard compressive strength of 20 psi and an insulating value of R-6 per inch of thickness.  See MISCELLANEOUS page for more info.

SECONDS are sheets that were pulled from the production line by the Quality Assurance inspectors for visible irregularities such as cosmetic defects, interior/edge pockets and/or voids, irregular or rough edges, out-of-tolerance dimensions, etc.  Typically only the ½ inch material might have pockets or voids that could materially affect the insulating value of the sheet (See PICTURE GALLERY page).  SECONDS bunks are not wrapped or packaged in bags as the OVERRUN material is. 

OVERRUNS usually appear factory-perfect, however they still do NOT meet one or more of the intended design specifications. Some reasons I've seen for these failures are CORE DENSITY, COMPRESSIVE STRENGTH, FACER ADHESION, or some other of the tests that are done after they've already made it through the STACKING/BAGGING/MARKING stage. That is why OVERRUN bunks come packaged in the factory-original heavy-duty white shrink-wrap bags whereas SECONDS do not.  And although of a higher physical quality than most “SECONDS”, they ALSO COME WITHOUT WARRANTY OF ANY KIND(See Warranty Disclaimer page)

ONE LAST POINT:  This material is factory SECONDS/REJECTS and I urge buyers to remember there are no brand markings on the sheets or bunks and SPECIFICATION SHEETS or FACTORY CERTIFICATIONS ("CERTS") are not available should you encounter an inspection of any kind, by any authority that has approval rights over your project. Zinsulation does not accept returns and you could find yourself out considerable effort and money!  It pays to consult with your project/building inspector first and get written approval before buying my material.


Call my cell phone: EIGHT ZERO ONE-717-5890 or email for further information. 

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PS: I'm a "retired" old fart and put this web site together myself.   (Zinsulation has 1 employee: me)

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