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 'facer' material laminated to both sides providing tensile strength to help resist breakage of the polyiso core. 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 cause the sheet to warp if exposed to moisture. The other type of facer is a fiber and resin material that is immune to the effects of water, but makes the sheets 10-15% heavier. This material is designated Resin (R) in the Inventory and Prices tables and costs more, but is recommended for any application 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. 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 this material.
Call my cell phone: EIGHT ZERO ONE-717-5890 or email email@example.com 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)