Because pool builders are producing many more than pools these days, it’s no wonder they are expanding their services to include options for shade. Gazebos and pergolas have long been in their repertoire, but here’s a relatively new concept to consider: Shade sails.

Those angular swaths of fabric — also known as sun sails — are becoming popular in backyards across the Sunbelt.

It’s easy to see why. They have an artful aesthetic that lends themselves to many architectural designs.

They appear simple to install, but there’s a considerable amount of design and engineering involved when done properly.

I’m going to address several frequently asked questions so that you can know how best to incorporate these stylish structures into your next project.

Where did the shape originate?

Sun sails are usually triangles or diamond shapes contoured along the edges.

The curves do more than give the fabric a dramatic visual effect. They keep the fabric taut when tensioned at every anchor point, removing wrinkles and giving the sail a nice tailored look.

What is the fabric made of?

Sails are made of knit mesh that allows some stretch. This makes the material conform to different patterns and designs while maintaining a smooth finish, provided it’s tensioned correctly. Because the material breathes, wind will pass through it, and it won’t trap heat.

But if the goal is to provide all-weather protection, consider a soft vinyl fabric. Keep in mind, this will require more engineering, especially in high-wind environments. This is where the shade contractor will consult with a structural engineer to address specific installation requirements. (More on that later.)

What different configurations can I do?

Perhaps a project simply calls for a single triangle. To cover more space, maybe two triangles or diamonds will do the job. To add visual interest, you can overlap the material and offset the sails so that angles are pointing different directions. Just be sure to overlap them by at least 3 feet to block out the sun.

You also can position one anchor higher than the others, giving the sail an eye-catching twist.

That’s why sails are becoming so popular: The clean, striking geometric shapes provide a cool architectural element to any backyard space.

The designer can manipulate patterns and configurations in a software program to see how the structure will function under the passing sun.

Is there such thing as too much shade?

You’re in no danger of growing a mushroom farm. Sails let in some light while filtering about 95% of the ultraviolet radiation. Lighter colors provide a shade factor of about 85%, and more saturated colors — green, blue, dark gray — register in the low- to mid-90s. Most shade-tolerant plants will thrive under the material.

How do I install a shade sail?

The product is installed one of two ways: It can be anchored to existing structures in the yard, such as border walls, fences or homes, or they can be attached to dedicated poles.

Regardless, the process involves engineering and tensioning techniques that might best be handled by a subcontractor. Yes, there are professionals who specialize in these installations. The Professional Awning Manufacturers Association (PAMA) is a subgroup of the Industrial Fabrics Association International. PAMA has members nationwide who are skilled in the design and installation of shade structures, including shade sails. These professionals have access to a variety of resources to ensure your shade project functions properly.

Shade fabricators can design structures through software programs such as Awning Composer. With these programs, contractors can upload a picture of the yard to simulate the shadow the sail casts throughout the day. They then can adjust the design accordingly to provide maximum shade.

How can I become a shade contractor?

If you want to provide this service in-house, I’d suggest getting involved with PAMA. It offers plenty of training and educational opportunities.

Participate in professional trade organizations and develop relationships with experts and you can turn your next shade sale into a shade sail.