FEBRUARY 2014:    Received last load from factory as they no longer make SECONDS or OVERRUN grade material.  When my existing inventory is sold out, ZINSULATION will close.

 SEPTEMBER 2014:  Closed out my smallest warehouse by consolidating material into the largest one (Soda Springs).

 MARCH 2015:   Consolidated material from Grace warehouse #2 into Soda Springs facility.

 APRIL 2015:   Moved all material from a temporary storage location to the Soda Springs facility.  This is when I found a bunch of 2.5" Overrun-grade with waterproof RESIN facer.

 APRIL 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. There is more material needing to be sorted and added to the inventory page later this year, but most of it is not the high-grade material currently available

And lastly, when 2014's P&L statement and tax returns were finished it became clear prices had to go up or else suffer financial losses.  The new prices became effective May 1st, 2015.

Thank you for your business, past and future.

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.

How I got into this enterprise....

 After considerable research and experimenting, 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 (foam insulation products are made with oil and other hydrocarbons).   What better way to stay comfortable using a 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.  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 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 you want, the same R-Value is achieved using multiple layers of thinner sheets.  And the cost will be the same since the material is priced by the cubic foot- not square footage.  IE: if you need 5" thickness of insulation you can stack two 2.5” sheets and achieve the same R-Value as a single 5” sheet would provide and the cost is the same as using a single 5" sheet.

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.

Most material is sold by the bunk.   A "bunk" is a 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 down as needed.  Thus a bunk of 1" sheets would consist of 48 sheets, while a bunk of 2" material would have 24 sheets.  Please see Product/Pricing Info page for details.  But no matter how much you purchase, the price-per-sheet will be far less than 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 insulation core with thin 'facer' material laminated to both sides.  The facer material provides tensile strength to help resist breakage the same as the paper facer on both sides of a sheet of gypsum board.  The facer does not contribute meaningfully to the insulation R-Value. Most of my inventory has a cellulose fiber (paper) with embedded fiberglass strands facer, which is much like a heavy-duty version of the construction-paper your teacher gave you in Elementary School.  It is the least expensive type, and the lightest, but it can be compromised or cause the sheet to warp if exposed to water. The other type of facer is a glass fiber and resin material that is immune to the effects of moisture, but makes the sheets 10-15% heavier. This material is designated Resin (R) in the Inventory and Prices tables and does cost more, but is far superior for applications in a wet or high humidity environment.

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.   SECONDS bunks are not 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 and has no brand markings on the sheets or bunks. SPECIFICATION SHEETS or FACTORY CERTIFICATIONS ("CERTS") are not available should any authority having approval rights over your project require such documentation.  And since Zinsulation does not accept returns, know your applicable building codes before buying this material!


Call my cell: 8Ol-7l7-589O 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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