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Frequently Asked Questions

All FAQ’s

What is the recommended maximum slope for Grasspave2?

The recommended max slope for both Grasspave2 and Gravelpave2 is 5% for fire lanes, 8% for cars and lighter weight trucks and 15% – 20% for golf carts, pedestrian use and trails. For grass installations with a slope greater than 20% Slopetame3 may be used and will...

What are the main advantages of Draincore2? 

Draincore2 is made from flexible 100% recycled plastic that can be slightly bent and shaped without connectors, T-joints or clamps. The product arrives in rolls and is lightweight and easy to install. The 92% void space allows drainage at the rate of 42 gallons per...

What is Draincore2?

Draincore2 is a 100% recycled plastic ring-on-grid system that allows for rapid, high volume drainage. A 92% void space allows drainage at the rate of 42 gallons per minute (per square foot.)

What sizes are available in Beachrings2?

Each Square unit is 40 cm x 40 cm (15.75 inches by 15.75 inches). Beachrings2 are available in 4 sizes. Beachrings2 must be at least 3 squares in width to accommodate wheelchairs and meet ADA compliance. See our Beachrings2 Size Details for more information.

Where are Beachrings2 typically used?

While the number one use of Beachrings2 is to provide wheelchair access on beaches, there are many other surfaces over which Beachrings2 can provide ADA accessibility. They have been used for weddings, outdoor event flooring and residential use to create an...

What is Beachrings2?

Beachrings2 is a temporary, reusable and easy-to-roll-out way to create an ADA compliant surface over sand, dirt, grass or snow. The 100% recycled plastic is lightweight, textured and flexible. Beachrings2 is available in 4 sizes and 3 colors.

What is Slopetame3?

Slopetame3 is a permanent erosion control mat comprised of ISI’s trademark ring-on-grid system, crossbars on every row and a permeable vegetative fabric layer. Duckbill anchors are provided to secure every roll.

What types of Rainwater Collection Systems are there?

There are several different types of Rainwater Collection systems. These include rain barrels, concrete storage tanks, arch chambers, milkcrate systems, and other plastic modular systems – such as Rainstore3. These different systems vary in size, cost, ease of...

What are Rainwater Collection Systems?

Rainwater Collection Systems include any vessel, tank or other basin that is designed to collect and store excess rainwater. Examples of these are barrels, concrete storage tanks, arched chambers, detention basins and plastic modular systems – such as Rainstore3....

What is Stormwater Management?

Stormwater management is anything designed to mitigate the adverse effects of stormwater such as flooding, mud, rutting, pooling and general lack of drainage. All Invisible Structures products are designed to address these issues.

Should I use a Rainwater Collection System?

There are several reasons to use a rainwater collection system. In areas with heavy rainfall where drainage is an issue, these systems can help mitigate the problems caused by flooding. All climates, including arid, can benefit by capturing rainfall and harvesting the...

What is an Underground Detention System?

Underground detention systems include any structure or vessel designed to store rainwater or other liquid beneath the surface of the ground. A primary function of the vessel is stormwater management. Rainwater can be captured and fed back into the Earth to replenish...

How are Rainwater Collection Systems Used?

Rainwater Collection Systems are used for either water detention or water harvesting. Either method is an effective way to control stormwater for flood prevention. For reuse, water harvesting is required from an impervious vessel or storage basin. Harvested water can...

How much Rainwater can a Rainwater Collection System Collect?

The amount of rainwater which can be collected varies by the type and size of the collection system used. Rain barrels typically hold 50 – 55 gallons per barrel. A rainfall of ½” on a 1,000 sq. ft. roof will fill one barrel. Concrete and plastic storage tanks range in...

Is Silt buildup an issue?

Silt buildup can be prevented by using proper pre-filtration, such as catch basins or sediment filters. Using Rainstore3 in conjunction with Grasspave2 or Gravelpave2 can eliminate the need for any filtration systems as the water would be filtered naturally through...

What is the Installation Process for Rainstore3?

Rainstore3 comes in preassembled custom height stacks that can be unloaded and dropped directly into the job site. Installation is fast and easy. For additional details please see the Rainstore3 Installation Guide.

What are the Main Advantages of Rainstore3?

Rainstore3, arrives pre-assembled, for easy installation. It is modular and stackable so can be installed in a wide range of depths, maximizing the capacity of water storage.

How much water can Rainstore3 hold?

Rainstore3 is 94% void space. A single unit holds almost 25 gallons, which means each cubic meter is capable of holding up to 250 gallons.

What are the common Applications for Rainstore3?

Rainstore3 is a solution for stormwater retention and detention as well as other applications requiring liquid storage. Water will percolate through the ground or covering and can either run through Rainstrore3 at a controlled rate or be stored for later use. Common...

What is Rainstore3?

Rainstore3 is a modular stackable underground water/liquid containment system. It is installed subsurface to be used as detention basins and retention harvesting systems. Made from 100% recycled plastic, units come preassembled for easy drop-in-installation.

How is Gravelpave2 maintained?

Gravelpave2 requires very little maintenance. The gravel in high traffic areas may need to occasionally be brushed or swept back into place. Over time additional gravel may need to be added depending on ware and maintenance. Round gravel tends to migrate outside of...

Can Gravelpave2 be plowed in the event of snow?

Of course. Gravelpave2 is easy to plow year after year without needing to replace any sections because the product will flex and bend with the freeze-thaw cycle. Simply add a skid to the corners of the plow blades to raise them and proceed as usual.

Is Gravelpave2 ADA Compliant?

Yes. Gravelpave2 provides a smooth and stable outdoor surface and has been tested, certifying that it complies with the requisite ASTM F 1951 standard – (per the Department of Justice 2010 ADA Standards for Accessible Design – Section 1008.2.6 Ground Surfaces.) When...

How much traffic can Gravelpave2 withstand?

Gravelpave2 can withstand daily, high frequency traffic. There is no limit to the number of passes per day. However, Gravelpave2 works best in areas with low speed traffic.

How heavy of a load can Gravelpave2 support?

Gravelpave2 can support the weight of virtually any vehicle. With a compression strength of 15,940 psi, Gravelpave2 exceeds H20 loading and has been the leading choice for porous utility and emergency access roads worldwide.

Can I use a binder with Gravelpave2?

Absolutely. A binder will add to the maintenance of Gravelpave2 but only every few years. It can help with steep slopes, sections adjacent to water features or any areas you want to prevent stone migration. Whatever binder you select for your project, make sure it...

Do rolls of Gravelpave2 have to be connected when installed?

Not necessarily. There are interlocking male and female connectors along the edges of each roll. The pieces can be easily snapped together in the field, but this step may be skipped on curves or large installations. However, the Gravelpave2 must be secured to the base...

What type of base course does Gravelpave2 require?

The most important aspect of a base course for both Grasspave2 and Gravelpave2 is its ability to maintain porosity while bearing weight. When choosing the right gravel to combine with sand for your road base, refer to our Base Course Material Recommendation and avoid...

Does Gravelpave2 require a base course?

The requisite depth of a base course is entirely dependent on the application. Some applications, which do not require heavy load bearing capacity or flood zone type drainage, do not require a base course at all. Vehicular applications will require varying base depths...

What is Gravelpave2?

Gravelpave2 is the first gravel porous paver and continues to be Designers’ top choice because of its impressive strength, ADA compliance, and long-lasting durability. Gravelpave2 is a 100% recycled plastic structure that can be easily installed beneath aggregate to...

Can Grasspave2 be plowed in the event of snow?

Of course. Grasspave2 is easy to plow year after year without needing to replace any sections because the product will flex and bend with the freeze-thaw cycle. Simply add a skid to the corners of the plow blades to raise them and proceed as usual.

Is Grasspave2 ADA compliant?

Absolutely. Grasspave2 and Gravelpave2 were the first, and continue to be one of the only ADA compliant porous pavers. For a link to our ASTM testing results for Grasspave2 click here.

Can Grasspave2 be used for fire lanes?

Yes, our second installation ever was one of the first porous fire lanes back in 1982, and since then we have provided product to countless other cities and countries worldwide. It continues to be our most popular installation.

How much traffic can Grasspave2 withstand?

While Grasspave2 is designed to withstand vehicular traffic, one must ensure that living grass gets enough sunlight, moisture and limited friction to protect its health. For example, parking in the same spots or frequent passes over the same areas on a daily basis...

How heavy a load can Grasspave2 support?

Grasspave2 exceeds H20 loading and has a psi of 15,940 so it can support the weight of virtually any vehicle. This is one of the many reasons why Grasspave2 has been the leading choice for porous fire lanes, utility and emergency access roads worldwide.

Does Grasspave2 work better with sod or seed?

Grasspave2 works very well with seed or sod. To achieve the best results with sod, use a thin cut sod or rinse off any excess soil with a hose prior to installation, as excess soil will cause compaction and loss of porosity. Hydrosourcing Seeding is most successful...

What types of grass should I use for the product?

We recommend using a deep rooting and hardy species such as Blue, Rye, Fescue, Zoysia or Bermuda depending on your area. Both sod and seed will be successful, but if using sod we recommend one grown in sand or a sandy-loam, especially for emergency vehicular access in...

Do pieces of Grasspave2 have to be connected when installed?

There are interlocking male and female connectors along the edges of each roll. If using Grasspave2 for a large installation, you can save time by skipping this step or interlocking only periodically, as the established grass roots will anchor the product. For fire...

What is Hydrogrow and what purpose does it serve?

Hydrogrow is a specially formulated polymer designed to rapidly promote healthy root growth for at least one year with regular watering cycles. Included with every order of Grasspave2, it can be easily distributed over the base course using a Spreader.

What type of base course does Grasspave2 require?

The most important aspect of a base course for Grasspave2 and Gravelpave2 is its ability to maintain porosity while bearing weight. When choosing the right gravel to combine with sand for your road base, refer to our Technical Specifications for your project and avoid...

What depth base course does Grasspave2 require?

The depth of base course required is entirely dependent on the application. It is crucial that our Technical Specifications are referenced, and municipalities consulted for areas such as fire lanes, as these requirements vary. Overall, a general guideline would be an...

How is Grasspave2 Installed?

Grasspave2 can be easily installed by a contractor or landscape professional. Roll out the product like carpet, over a compacted, porous base course and our specially formulated growth enhancer, Hydrogrow. Fill the rings with sand, finish with sod or seed and wait...

What is Grasspave2?

Grasspave2 is the world’s leading choice in porous paving - a flexible, recycled plastic structure that sits unseen below a real grass surface to allow for the weight of virtually any vehicle while protecting the grass roots. With ADA certification and a compaction...