The Granger ISS Underground Storm Shelter provides your family a number of leading innovations and amenities that assist in providing your family near absolute protection only found on the Granger ISS shelter. With an industry leading life span, durability and warranty- ensure your families safety in the next tornado or inclement weather situation with near absolute protection with a Granger ISS Storm Shelter.

Double Wall Foam Filled Storm Shelter

The Granger ISS Storm Shelter features one of the most durable constructions of any underground storm shelter. The Granger ISS Shelter is manufactured via the rotational molding process from Polyethylene, one of the most durable materials on the planet. The polymer construction of the shelter will resist rusting, cracking and corrosion, like less innovative units manufactured from steel or concrete. The body of the ISS features double wall construction, with a ½ inch wall on the inside and a ½ inch wall on the outside. The two walls of the unit are filled with a non VOC foam adding extra strength, rigidity and condensation control.

Patented Reverse Taper Storm Shelter Design Offers Easiest Installation Available

The patented storm shelter design and shape of the Granger ISS Storm Shelter is one of its most unique features. The unit has a reverse taper design which means it is wider at the bottom than it is at the top. This reverse taper allows for the unit to be installed directly in the ground without an additional anchoring system. No messy concrete or complicated installation is needed. In fact, it’s the easiest shelter on the market to install.

Easiest Storm Shelter Installation Available. – A typical installation of the Granger ISS Storm Shelter usually takes 4 hours or less. Simply dig the hole, position the unit and backfill with the dirt pulled out of the ground. The ISS can be installed outside an existing home or in new construction and even be retrofitted into certain areas. With no anchoring system requirements, the Granger ISS offers the easiest storm shelter installation in the industry!

Triple Panel, FEMA 320 and 361 exceeding Door

The door is the most important part of any underground storm shelter because that is what is between you and the tornado. A door should be tested for safety following the FEMA 320 or FEMA 361 guidelines that tests the durability of the door to withstand debris flying at wind speeds of 250 MPH. The door of the Granger ISS Storm Shelter is a unique design that includes a double wall polyethylene exterior panel, a double wall polyethylene interior panel and a sheet of polycarbonate bolted between for ultimate safety and near absolute protection from storms and tornadoes.

Dual Gas Assisted Shock System – Any door designed to protect you against a tornado is going to be heavy. Though lighter weight than other materials the polyethylene door of the Granger ISS is no exception. To ensure the easiest entry and exit possible, each Granger ISS comes with two gas assisted shocks to help open the door.

Industry leading FEMA & ICC 500 specification exceeding door

Triple Locking System – The Granger ISS Door has a triple locking system to ensure the highest level of safety and closure.

Custom Color Doors – Minimize the look of your storm shelter or customize the door to blend in with your home. The unique feature of a colored door and vent allow the Granger ISS storm shelter to look the way you want it to. Choose green to blend in with grass and landscaping, gray granite to blend in with a concrete floor or brown granite to blend in with mulch. Many other colors available upon request including your favorite team colors!

Articulating Handrails – Each Granger ISS underground shelter has articulating handrails that can be used for safer and easier entry into the unit. When not in use the handrails fold neatly to the side and do not take up valuable interior room. They can easily be raised again and locked into place upon exiting the unit for added safety.

Easy, Three Step Entrance– With only three steps down to the seating of the unit, entry into the underground storm shelter takes only seconds. The vertical entry is easy for most people and does not impede on the interior space.

Molded In Seating – The Granger ISS exceeds FEMA standards for 6 adults though several more can fit in an emergency. Molded in circular seating allows occupants to sit comfortably with seating taking up as little space in the interior of the unit as possible. Even taller occupants will be able to sit straight with plenty of headroom, or stretch their legs by standing in the entry area.

LED Lighting System - Each Granger ISS comes complete with LED lighting. Simply touch the light upon entry to see inside the unit when the door is closed. Each unit comes with one LED light though additional lighting can be added.

Limited Lifetime Warranty – The Granger ISS storm shelter provides a lifetime of peace of mind from inclement storms and tornadoes. The storm shelter is warrantied through the lifetime of the original owner for cracking, leaking, rotting, rusting or any type of deterioration of the body of the unit. This warranty also covers any other material or manufacturers defects. No short 5, 10 or even 20 year periods, the Granger ISS Underground Storm Shelter offers a lifetime warranty. Know that your family is safe when you need near absolute protection!

Separate Door Warranty – If a tornado shelter door is damaged in a tornado, many experts warn the shelter may no longer be safe. The door of the Granger ISS is replaceable if damaged which is a unique feature on its own. However, Granger Plastics Company offers a separate warranty on the door of its unit to its customers. If the door of your Granger ISS is damaged in a verifiable tornado Granger Plastics Company will make sure it is replaced at no additional cost to the homeowner.

Guaranteed Not To Float – The Granger ISS is guaranteed not to float! Granger Plastics works with a variety of qualified installers for self-installation or also offers turnkey pricing including full service installation. Any shelter installed by an approved installer is guaranteed not to float!

Storm Shelter Videos

Storm Shelter Features

Many people question the differences amongst the storm shelter industry. Learn in the video above why Polyethylene, a "fancy" word for a specific type of polymer based material, that is impervious to rusting, rotting and other corrosive material degredation. Learn how Granger Plastics Company continues to offer the industry's leading Storm Shelter value, providing the longest lasting near absolute protection for your family!

Storm Shelter on The Weather Channel

See America's leading Storm Shelter on the world's most authoritative television station dedicated to weather, The Weather Channel.

Storm Shelter on HouseSmarts TV

See the Storm Shelter innovation that continues to provide near absolute tornado protection for families all across the United States! Provide the ultimate level in tornado safety and protection for your family and loved ones! Watch the video above to see the Storm Shelter feature on nationally televised HouseSmarts TV!

Storm Shelter Debris Impact Testing (Full length)

See the Granger ISS Storm Shelter door go thru the FEMA 320 and FEMA 361 Debris Impact tests at Texas Tech University's WISE labs! The Granger ISS Storm Shelter door successfully completed BOTH tests using the SAME DOOR! Always requrest to see the Door Impact Testing Video from ANY Storm shelter manufacturer!

Storm Shelter Debris Impact Testing (Short)

Not have time to watch the full length FEMA 320/FEMA 361 testing? Watch the short version! FEMA 320/FEMA 361 Debris Impact Testing taking place as Texas Tech University's WISE labs.

Storm Shelter Installation

Watch as the Granger ISS Storm Shelter is installed quickly and easily in about a half of a day's time! From start to finish in around 4 hours! America's leading storm shelter, the Granger ISS provides industry leading features and the easiest installation of any underground shelter on the market!

Tornados Meet Their Match With Life Saving Home Improvement

Ohio's WCPO 9 covers the Life Saving home improvement built in Middletown, OH that offers provides near absolute protection for a family from inclement weather and tornados. Watch the video to learn more about the lifesaving home improvement storm shelter.

Storm Shelter Featured on The List Television Show

See a Storm Shelter customer rave about their Granger ISS storm shelter on the nationally televised show The List!

Storm Shelter Shelter Information