How We Construct Our Backflow Enclosures and Outdoor Pump Covers

Not all enclosures are created the same. Some are assembled before they're shipped. Others use spray-on insulation that leaves air gaps and collects dirt. Some are simply plastic enclosures or fake rock covers, while others aren't ASSE 1060-certified.

None of these enclosures are optimal when you're trying to protect pumps.

The best way to design and assemble backflow and pump enclosures is to use marine-grade aluminum, polyisocyanurate insulation and a modular-panel design. An enclosure built this way will provide the best protection for your equipment. It will also withstand the elements while providing easy access for testing.

Here's how we design and assemble Safe-T-Cover aluminum enclosures for peak performance.

Side Panels - Backflow and Pump Enclosure Design

The first step in putting together a high-quality aluminum enclosure is constructing the side panels. Each of our panels is fitted with 1½ inch of polyiso insulation. 

The insulation is not glued to the enclosure panel; it's cut to the exact dimensions of the panel, form-fitted around the edges of the insulation and held in place by rivets. A 2x4 piece of sustainable California redwood provides additional structural support. 

The R-value for polyisocyanurate insulation is the highest for rigid-board insulation at an average of 6.5 per inch. Standard Safe-T-Cover enclosures have 1.5 inches (R-9) of polyisocyanurate insulation in the walls and three inches (R-18) in the roof. This material is commonly used in the roofing industry and is superior to the spray-on insulation because it won’t crack over time or leave air gaps.

By using such high-quality components, our enclosures more than meet ASSE 1060's requirement for insulation and can even contribute to prolonging pump life. 

Roof Panel - Enclosure Design

Safe-T-Cover roof panel design is very similar to that of the side panels, and the design process is essentially the same. The biggest difference is the roof panel may get a larger 2x6 redwood beam for added strength, excellent protection and rigidity. Three inches of insulation is used on the larger model enclosures.  

If you'd like to see how one of our enclosures is built, watch this video.

You can also check out our free guide, How to Buy a Custom Enclosure. This checklist is designed to walk you through all the necessary steps for designing and buying a custom enclosure.

How We Ship Our Backflow and Pump Enclosures

Safe-T-Cover enclosures are made using a modular panel design which lets us ship them flat. This enables easier delivery to project sites while minimizing shipping expenses. Each shipment comes with a step-by-step instruction guide, diagram and installation hardware. 

The installation hardware includes anchoring brackets, roof clips, anchors and screws. You'll also receive a masonry bit and magnetic chuck. The only tools you'll need are a drill, hammer and a ¾-inch wrench. 

And with a little help, you can have your enclosure together in less than an hour. 

Safe-T-Cover uses marine-grade aluminum, high-quality metal that will typically outlast the equipment it covers. Our enclosures come in four standard colors at the base price. Check our enclosures page to find a full list of 20 more colors that are available for an additional cost. Being able to choose the right color can often satisfy an owner's objection to a big shiny box.

Learn how backflow enclosures are helping to save lives.

FAQ About Pump and Backflow Preventer Enclosure Construction

Do Safe-T-Cover enclosures offer freeze protection?

Yes, our enclosures have ASSE 1060 Class I certification for freeze protection. In places where freezing temperatures last for days, we recommend adding a ASSE Class I heater to ensure the enclosure remains at 40 degrees F in temperatures as low as -30 degrees F.

How do aluminum enclosures protect pumps?

Aluminum enclosures protect pumps by shielding them from harsh weather, vandalism and environmental damage, while maintaining optimal internal temperatures with insulation and climate control. Their customizable, secure design ensures easy maintenance access and long-term durability. These enclosures also blend into surroundings with options for color, landscaping and wraps, making them a practical solution.

Can exhaust fans be installed in custom enclosures for the summer heat?

Yes, exhaust fans can be installed in custom aluminum enclosures to help manage summer heat and protect temperature-sensitive equipment. These fans improve ventilation by removing hot air to reduce the risk of overheating. Custom enclosures can be designed to include fans, louvers and thermostatic controls based on specific climate and equipment needs.

Are these aluminum enclosures easy access — do they have a door?

Yes, aluminum enclosures are designed for easy access and typically feature hinged doors or removable panels. These access points can be custom placed to align with maintenance needs, allowing technicians to reach components without hassle. Lockable doors also provide added security while maintaining convenience.

Do your custom enclosures offer corrosion resistant materials?

Yes, Safe-T-Cover’s custom enclosures are built with corrosion-resistant marine-grade aluminum, which stands up well to moisture, chemicals and harsh environmental conditions. This ensures long-term durability with minimal maintenance, even in coastal or industrial settings. Optional powder-coated finishes add another layer of protection and aesthetics.

What is the difference between fiberglass, fake rock and other enclosure materials?

Fiberglass enclosures are lightweight, can crack or degrade over time and lack structural strength for larger equipment. Fake rock enclosures are often used for aesthetic purposes, but offer limited security and poor insulation. Aluminum is the gold standard that offers the strongest protection with customizable sizes, climate control options and secure access panels or doors.