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Welcome to Inground
Severe weather is notoriously unpredictable. We have a vast knowledge about the conditions and suroundings that cause it and how often this occurs throughout the country. We have sophisticated warning systems, as well as extensive radio and 24/7 news and television coverage of these storms and Tornadoes as they approach and even destroy. Even with all of this technology and warning systems, still hundreds are killed each year from tornadoes, freak storms and other disasters, with thousands more injured. Property loss and damage is routinely in the billons of dollars. Help protect your family today with an investment into your families lives by keeping them safe from tornadoes and tornado destruction with an Inground Shelter by Granger Plastics!

Granger ISS / Tornado Shelter

The extremely durable, innovative, polymer construction of the Inground Safety Shelter can provide a useful life span that under most conditions should exceed 500 years! Unlike concrete, steel and fiberglass Tornado and Storm Shelters, the Polyethylene construction won't deteriorate, alleviating concerns and maintenance issues that apply to other materials. Concrete shelters tend to settle and form cracks throughout the unit. With fiberglass moisture is a problem causing the unit to crack, deteriorate and/or possibly rot. Unlike Steel units, the Inground Safety Shelter will not rust or corrode. The extremely thick 1/2" double wall construction, offers not only the extreme strength of a rotationally molded product, but offers a wall thickness combination that exceeds most single wall units.


The only Storm Shelter with a Safe Room/Panic Room quality door!

See the NEW Granger ISS door exceed both FEMA 320 & FEMA 361 testing!

See the new generation of Granger ISS Storm Shelter doors under go FEMA 320 & FEMA 361 testing at Texas Tech University's Wind Science & Engineering Research Center. The Granger ISS is an underground Storm Shelter, so in theory, it only needed to be tested to FEMA 320 standards. Due to the high quality engineering staff at Granger Plastics, the Storm Shelter door not only meets or exceed FEMA 320 standards, it also meets Above Ground Safe Room criteria by exceeding the FEMA 361 standards. The same door passed (2) tests, being impacted (3) times by a 15 pound 2 x 4 at 67 mph, then seeing an additional (3) impacts, by a 15 pound 2 x 4 at 100 mph. Even though the second test was unnecessary due to the Granger ISS Storm Shelter being an underground unit, but went forward with the more grueling test anyway to display Granger's commitment to safety, innovation and quality. This is all just another example of why Granger Plastics produces the best storm shelter available for single family consumers. Granger Plastics has been manufacturing Storm Shelters for over 15 years currently. Even gaining international attention as early as 10 years ago from Internationally recognized publications such as Plastics News, USA Today and a number of news channels and media outlets across the country!

Click any of the links or videos below to watch or read the appropriate story

Granger ISS Storm Shelter- USA TODAY

Granger ISS Storm Shelters- Fox 19

Granger ISS Storm Shelter- Local 12

Granger Plastics- Plastics News- August 2001

Granger Plastics, Tornado Shelter, Granger Tornado Shelter, Granger Plastics News

Granger Plastics- Plastics News- August 2001

Granger Plastics, Tornado Shelter, Granger Tornado Shelter, Granger Plastics News

Granger Plastics has been building Storm Shelters for over 15 years now! Unlike many, who opt to only seasonally get into the business, or only pursue the business when the storm season is convenient for them, Granger Plastics manufactures World Class innovations year round, for over 17 years now. Granger has innovated its own patented Storm Shelter design.

Read more about the Granger ISS Storm Shelter features, dealers and Frequently Asked Storm Shelter questions.

Granger ISS Door Guarantee

Granger Plastics, a world leading Rotational Molding company, takes great pride in its manufacturing of safety products, such as Storm Shelters. When your Granger ISS Storm Shelter door does its job of saving you and your families lives from an inclement, National Weather Service verified Tornado and your Storm Shelter door sees impact damage from Tornado debris, Granger Plastics and your local dealer will replace your door free of charge. Just pay shipping and handling and you will recieve a brand new door, to ensure your families safety. As simple as that! We are committed to your family's safety!

Rotomolding Company Continues Growth Converting Fiberglass Products to Polyethylene

Granger Plastics Company has a long history of researching and converting products to polyethylene. One of the most converted materials is Fiberglass. Inferior molecular structure, issues with rotting and deterioration as well as expensive repairs are only a few of the issues with fiberglass. The superior durability and extremely long life span as well as being practically maintenance free are just a few of the reasons our customers choose to switch to polyethylene. It is easy to see how these same qualities of both fiberglass and polyethylene should be considered when making your tornado shelter investment.

Press release date: August 25, 2011

As times are changing and the corporate world wants to stretch every dollar, Granger Plastics is being sought out to convert fiberglass products into polyethylene. Polyethylene's durability, long life span and superior molecular structure make the transition a logical choice for many original equipment manufacturers and other companies. Granger Plastics has made many of these conversions to the great satisfaction of our customers demonstrating the company motto of "Solutions Beyond Expectations".

"Having introduced the world's first all-polyethylene rear trailer 'cone' as the replacement for 'cones' that have historically been fiberglass, we are pleased to advise that the new PolyCone produced by Granger Plastics Company is performing well in the field: Better impact resistance, better scuff resistance and lower cost. When a PolyCone is dented in the field, we just push it back into its original shape and send our enclosed car hauling equipment back on the road. Damage to fiberglass has always required bodywork to repair. We are pleased with the results of our material conversion project with GPC.

-Jim Prang
Director of Maintenance
Precision Motor Transport Group
Okemos, MI

Click to read "Rotomolding Company Continues Growth Converting Fiberglass Products"

Our Shelters are in stock! No deposit required with a long wait! No waiting 4-6 weeks to get your unit! Order today, your unit can ship today!

Tornado Shelter & Storm Shelter Comparisons

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Tornado Shelter Literature, Tornado Shelter Information, Tornado Shelter

Tornado Shelter Information & Features

The Inground tornado shelter by Granger Plastics is the most durable Tornado Shelter in the shelter industry! With a lifespan that exceeds 500+ years! Manufactured from extremely durable, Polyethylene, the Inground Shelter features a FEMA 320 exceeding entrance door, articulating aluminum handrails, a 3-step molded entrance with non-skid steps, a molded in 4" ventilation stack, molded in seating, all stainless steel hardware, a Rotationally molded Shock cover and ventilation stack and a reverse taper design that does not require an anchoring system in typical installations! See why the Inground Shelter by Granger Plastics is the best safety bet for your family!
Are you considering the purchase of a Tornado Shelter? Do you have questions about the different materials offered? Read more about Tornado Shelters, the differences in the materials offered to protect your families lives and frequently asked questions in regards to Tornado Shelters before you make that purchase!
read more Tornado Shelter FAQ

Become a Tornado Shelter Dealer?
Would you like to sell a high quality product, that could make a difference in nearly all of your customers lives? Do you have a complementing line of business that makes sense to go into the Tornado Shelter market? Would you like to sell the best Tornado Shelter on the market? Click below for more details!
How to become a Tornado Shelter Dealer
3-Step entrance
Articulating Handrails
Circular Molded Seating w/ Carpet
3pt. locking security Door
FEMA 320 exceeding door
Battery operated LED lighting
Molded in 4" Ventilation cap
Tornado Shelter features
Tornado Shelter Videos

Tornado Shelter Manufacturing & Assembly Video

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