General Product Questions

How much do the modular trays weigh?
ConditionPer Square FootPer Module
Dry12.5-16 lbs.33.75-43.2 lbs.
Saturated16-19.5 lbs43.2-52.65
When should installation occur?

The optimal installation season is during Spring--late April to June. Modules are shipped via pallet and should be installed ASAP upon arrival. 

Do vegetated roofs require irrigation?

The industry standard sedum species grown on vegetated roofs are very drought tolerant, and commonly do not require irrigation. However, Rooftop Green suggests installing an irrigation system as a safety measure for especially dry periods and for the establishment phase. 

If natural precipitation is less than half an inch for a 10-15 day period during the growing season, a watering session is vital in preventing plant dormancy or death. During these periods, approximately 1-2 inches of water once a week should be applied. 

All watering guidelines are general suggestions, and cannot take the particular weather conditions in your area into consideration. Please contact a Rooftop Green specialist if you have any questions. 

Do they need to be weeded?

Yes. Invasive species will appear, even atop a roof. The keys to weeding are prevention and timing. Spot weeding should occur at least once a month to ensure weeds are removed before they flower and seed. Full weed sessions should occur in May and October, and often during the summer. 

Will the modules need pruned or clipped?

No. Our species varieties are specifically chosen to be high coverage, yet low maintenance. 

How long until the modules reach maturity?

The sedum mats installed in Rooftop Green modules take time to become established in their new climate. They should reach maturity after one full growing season--roughly a year.

Do I need to fertilize the system?

Fertilization should occur during the Spring annually for the first 3 years after installation. A generic 10-10-10 slow-release fertilizer should be applied at the grass sewing rate. 


Commercial Customer Questions

Can maintenance teams and landscaping companies install Rooftop Green trays?

Yes. Rooftop Green modules are designed for quick and easy installation. As long as guidelines are followed, anyone who can get on the roof and lift roughly 30 lbs can install a Rooftop Green system.

Are there specified roofing contractors for Rooftop Green tray systems?

Any contractor can install our trays; however, you may contact Rooftop Green for a reference in your area.

Will this system assist in storm water management?

Yes. Our modules are specifically designed with plastic polymer trays that are proven to act as retainers and filters for runoff water that can be problematic.

Are there tax incentives for Rooftop Green systems?

Yes. Multiple tax and fee mitigation incentives are available for your green roof project. These include, but are not limited to impervious surface tax break, or a waste water runoff management incentive.

Do Rooftop Green trays contribute LEED points?

Yes. Our vegetative roof systems can add up to 10 LEED points to a single building.

Contractor Questions

What tools are needed to install Rooftop Green modules?

As always, the appropriate safety equipment for roofing work is required. For small projects, just a ladder, gloves, and a set of plyers is all that is needed.

Do large projects require special equipment?

For a project exceeding 250 or more square feet, a boom, mini-crane, or service elevator can also be alternatively recommended to transfer the trays to the roof.

What prep work is required for a Rooftop Green system?

Be sure the roof surface is dry and clean with no known leaks.

Where can the system be picked up?

The portable nature of our trays make them easy to ship on site, but will-call orders can be retrieved at the Rooftop Green facility at the Cleveland Industrial Innovation Center.

What are the shipping options for the modules?

For small orders, trays can be delivered in individual packages via UPS. For larger orders, the modules can be received in large palletized LTL or fright orders.