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A green roof, or eco-roof and living roof, is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over waterproofing membrane. Some call it "rooftop landscaping".

This form must be completed and signed prior to us conducting any moisture testing. We cannot perform the moisture testing requested by the buyers without this form being signed.

Green roofs can provide a significant impact on reducing the need for such stormwater infrastructure. As a result, much less water runs off the roof compared to conventional rooftops. Green roofs are just one component that may be used to achieve LEED certification for new and existing buildings, as they promote energy savings for heating and cooling systems.

Hi Alex, no first-hand knowledge of this particular type of backflow, but on the other hand, I don’t have first-hand about a lot of the safety issues we call out as home inspectors.

So why do I need this thing? A vacuum breaker, commonly referred to as a backflow preventer, is a device that prevents the potable water in your home, and possibly your neighborhood, from getting contaminated. It’s basically a one-way valve.

Whenever I visit a large city, I love taking pictures of buildings and pondering each building's story- design, construction and use. I love natural landscaping and waterscapes- interior or exterior, because it stirs our human spirit.

Roof to Sewer- from the roof drain to the storm drainage piping to storm sewer, eventually making its way to the city sewer system. Roof to Storage- from the roof drain to the storm drainage piping to a stormwater storage tank or basin, retention pond or reservoir. Roof to Ground- from the roof drain to the storm drainage piping and the water is left to splash on the ground where it dissipates naturally.

In some residential high-rise living spaces, roof top landscaping might simply include a private roof deck area or a common roof space that has landscaping.

We will make every effort to use a caulk that closely matches the color of the surrounding siding; however in some cases the holes may be noticeable upon close inspection. If the holes are of any cosmetic concern the property owner can have them painted with a matching paint.

Compressed air separators remove water and oil from the compressed air, or they separate oil from water in the collected condensation.

We really only think about our commercial roofs when it rains. A roof drain is installed on a building roof to convey storm water from the roof to the storm drainage sewer or retaining area and often not maintained being out of sight.

If your property is assessed as a High or Medium hazard risk, then you need to install an appropriate containment backflow prevention device.

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Where can I find a vacuum breaker? Vacuum breakers are sold at hardware stores and big box home improvement stores. You’ll typically find them near the outside faucets. The cheap one pictured at the beginning of this post doesn’t technically meet current plumbing code requirements because it’s not field-testable, but Minneapolis will let them slide.

Thermostatic mixing valves testing must be done by a qualified plumber annually, such as CRG. A TMV is a valve that blends hot & cold water.

If you’re selling a house in Minneapolis, get some vacuum breakers. When you have a place for a garden hose to connect to the municipal water supply, you need some type of backflow prevention, and that’s what these devices are for. This is one of the required repair items for the Minneapolis Truth-in-Housing evaluation, which is a required inspection for anyone listing a home for sale in Minneapolis.

From the perspective of architects, civil engineers and city planners, the capture of rainfall may be the greatest perceived benefit to green roofs. Existing sewage infrastructure is aging, lacking heavy rainfall capacity and ground level detention basins or retention ponds are expensive.

FLOW is an AI-enabled software and specialty service platform, focused on sustainable water flow. Our mission is to help properties unlock sustainable data, enable water flow circularity and preserve nature.

The one space never seen, but now important, is the roof top. When I look across the skyline, I see massive roof top space not being utilized. These roofs collect a huge amount of stormwater and offer great solar & wind opportunities.

Green roofs, now becoming "green blue roofs", are usually installed on flat roofs with vegetation planted in a growing medium on top of waterproofing, root barrier and cuspate sheeting. The sheeting retains moisture in between rainfall events or manual watering.

While these scenarios aren’t likely, it has happened many times throughout the country, and the cost of fixing a contaminated water supply for a city is huge. The cost of a vacuum breaker is very little, about eight dollars. While Minneapolis enforces this plumbing code requirement at the time of sale, this isn’t a special requirement for Minneapolis. Vacuum breakers are still required by national plumbing codes all over the country, and they’re required throughout Minnesota by the Minnesota State Plumbing Code, section 4715.2100 (D).

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Naturally, an initial step is to have site assessments and assistance in finding green incentive programs and additional fee-based support you can count on.

Stormwater Drainage- green roofs can reduce stormwater runoff, reducing the drainage flow by over 75% during rainstorms (low impact development). Reduce Urban Heat- green roofs can substantially reduce the city's average temperatures during the summer, combating the urban heat island effect. Ecological benefits- green roofs create natural habitat (an urban wilderness) filtering pollutants and carbon dioxide out of the air and reduces noise. Energy Savings- reduction in a building's energy use is an important property of green roofing.

In order to perform this inspection, we need the permission of the owner. We should have access to all parts of the exterior. Any security systems will need to be shut off during the testing, which can take several hours. We use standard industry practices for conducting the moisture tests, which includes the use of a penetrating probe meter to verify the moisture content of the structural wood and sheathing of the building. 3/16” holes will be placed under most windows and other possible moisture entry areas. These holes will be filled with caulk when the testing is completed.

When I once owned a nationally ranked landscape architecture and construction company, I had a national hotel ask ne to landscape the roof top atrium. It was really strange to coordinate soil, plant supplies and even trees to the top via an elevator. At that time, the concept of a "green roof" or rooftop seating area was extremely rare, but the contracting experience has now gained popularity.

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Thank you for explaining why the city of warren,MI has a requirement for installing vacuum breakers on sillcocks and laundry tubs. I believe it would require a completely stupid, thoughtless person to actually contaminate their potable water the way you’ve described it (something I’m willing to bet one of the five totally incompetent building inspectors has managed to do) but as improbable as the set of circumstances are that would lead to this you’ve made it make sense to someone with a good understanding of plumbing systems who keept wondering why you would need a vacuum breaker attached to something that closes completely with a valve and has water pressure pushing against it.

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[…] Vacuum Breakers – aka backflow preventers.  This is a device that can be purchased at most hardware stores, and should be screwed on to the end of any exterior sillcocks, or indoor faucets that could accept a garden hose thread (typically the laundry faucet).   These are basically one-way valves that protect the city’s water supply from potential contamination.  Note the set screw in the vacuum breaker pictured to the right – this set screw should be tightened down until broken off to make sure the vacuum breaker is permanently installed. […]

Because we have a deep history in plumbing, landscaping, environmental services and water tech, we take our water & ecological leadership in the building industry very serious. We understand every physical space is unique.

One building space gaining ecological attention is the urban rooftop- managing stormwater during heavy rains, a space for landscaping and now even gardens.

However, I did witness toilet tank water get siphoned into the drinking water of a home I was inspecting once. The water in the tank was black, and a big slug of that water came out of the tub spout as I was filling the bath tub. It happened right went I flushed the toilet.

The two most common places where these are installed are at outside faucets and at laundry sink faucets with garden hose threads. An external vacuum breaker is required at outside faucets if they don’t already have one built in. How do you know the difference? Look for the number “1019” or “1011” somewhere on your faucet. If it has that, you don’t need an external vacuum breaker. Check out the examples below; none of these faucets need an external vacuum breaker.

Structure Tech specializes in the moisture testing of buildings for the purpose of determining if there is moisture located behind the exterior wall cladding. A moisture inspection of your property has been requested.

Building owners know that the development of rainwater harvesting, stormwater collection & reuse, green roofs, green infrastructure, interior & exterior landscaping, and waterscapes can involve a plethora of disciplines and professions. Certainly, this includes architects and engineers, together with public officials and a wide variety of different construction trades.

Roofs were always just a “functional component” a building never seen except rarely by building maintenance. Some architects design roofs to give character to individual buildings and entire city skyline.

But today, roofs are coming to be viewed more and more as reserve urban space for creative planners looking for socially responsible concepts that counteract the loss of natural living spaces. Building owners are recognizing the value of filling the unseen space with new life- the “rooftop landscape” or "rooftop destination".

A roof can play a decisive role in the water management of a building, an entire urban district and a city itself. Temporary water retention on a roof is effective for absorbing heavy rainwater and draining it in a controlled manner.

I know they have to be called out in an inspection, but I have never actually heard of a scenario where something bad happened to somebody’s house because of the lack of a VB.

With a collaborative and value-added mindset, the goal of green roofing is to increase leasing and the value of a building, urban neighborhoods and entire cities by consolidating the skills and technologies of many specialty construction trades. A transformed rooftop creates a wonderful marketing & sales story.

How could your water get contaminated? Picture this scenario: I want to mix up some vegetation killer, so I buy the concentrated stuff, pour it into a garden sprayer, then put my garden hose in the bucket to fill it. I turn the water on, but I get sidetracked with a plumbing project.  I shut off the water to my house, and then open up the laundry faucet to drain the water out of the pipes. This will create a siphoning effect, which could actually suck the nasty chemicals in the garden sprayer back into my home, contaminating the potable water. An even worse scenario would be the city doing work on the water pipes, and the chemical gets siphoned back into the city’s water supply, contaminating a whole neighborhood.

If you have a laundry faucet without garden hose threads, you don’t need one of these devices. And you also don’t need them at the water supply connections for your washing machine.

Thanks for the great info. I found your site while trying to figure out what that brass thingy was on our outdoor faucet. Your explanation is fantastic.

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In today's urban world, one of the biggest challenges is with building leasing and ownership costs. Going green initially targeted energy, but now the need to attract new tenants or retain tenants is requiring a different approach- creating healthy, sustainable building spaces with ecological inspirations.

We face a global challenge to responsibly use and protect our water flow and to improve how we design and develop property. We must seek smart water flow management practices that provide sustainable solutions for the world's increasing clean water needs, protect human health and our environment.