Shademaker Atlas 11.5' Square Centerpost Umbrella

Shademaker SKU: ATL-35S-SS/5403
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&
Shademaker Atlas 11.5&

Shademaker Atlas 11.5' Square Centerpost Umbrella

Shademaker SKU: ATL-35S-SS/5403
Canopy Fabric Color
Frame Finish Color
Regular price $3,099.00
/
  • Free Standard Shipping (Contiguous U.S.)
  • Inside Delivery / Assembly Available (Upgrade at Checkout)
  • Protective Cover Included
  • Authorized Shademaker Dealer
  • Estimated Delivery Between:
  • Inventory on the way
  • House Icon Explore premium delivery and assembly options. Learn More

Estimated Shipping Widget will be displayed here!

Shipping calculated at checkout.
Request Trade Pricing

Commercial Outdoor Umbrella Built to Last

Experience luxurious shade and superior comfort with the Shademaker Atlas  11.5’ Square Centerpost Umbrella. Its simplistic yet contemporary design brings innovation to any outdoor living space, ensuring you stay cool and stylish under the sun. This telescoping umbrella features a galvanized steel stem, commercial-grade fasteners, and modernly designed aluminum hub and fittings so that you can enjoy a reliable and weatherproof umbrella for years to come. 

Available in a variety of contemporary colors and neutral tones, Libra is made from 100% solution-dyed acrylic and polyester fabric, woven by two of the most popular names in outdoor fabrics: Sunbrella® and O'Bravia®. These premium materials offer superior resistance to corrosion, mildew, fading, wear, and tear, making this umbrella perfect for any commercial, market, or residential space. 

Also available in 10' Square, 10' Octagon, and 13' Octagon models. 

Why Choose the Atlas 11.5' Square Centerpost Umbrella

1. Telescoping Mast

Engineered with a telescoping mast design so that you can achieve unobstructed closure over tables and furnishings without the need for repositioning. Ideal for high-traffic or fully furnished commercial environments.

2. Quick & Effortless Crank Lift System

Integrated with a precision crank mechanism so that you can deploy or retract the canopy smoothly and securely with minimal physical effort. The lift system ensures consistent performance across repeated use cycles.

3. Premium-Grade Aluminium Hub & Fittings

Manufactured using high-tolerance aluminium components so that you benefit from enhanced structural stability and resistance to wear, even under demanding operational conditions.

4. Commercial-Grade Canopy Fasteners

Outfitted with reinforced fasteners so that the canopy remains taut and secured under varying weather loads, while contributing to a streamlined, architectural appearance.

5. Removable Crank Handle

Designed with a detachable crank handle so that you can prevent unauthorised operation and reduce mechanical wear when the umbrella is not in use—particularly advantageous in public or shared spaces.

6. Galvanized Internal Mast Stem

Incorporates a galvanised steel mast stem so that you gain superior corrosion resistance and long-term reliability in outdoor installations, including coastal or humid environments.

7. Includes Aluminium Mast Stem Cover

Equipped with an anodised aluminium stem cover so that the internal components remain protected from environmental exposure, while also delivering a clean, professional finish.

8. Includes High-Performance Protective Cover

Supplied with a weather-resistant protective cover so that the umbrella remains shielded from UV degradation, moisture, and debris when not in use—extending its operational lifespan.

NOTE: Images displayed above may feature both square and octagon canopy options to demonstrate lifestyle settings and mounting/base options. Additional color options are available upon request. Check them HERE or CONTACT US for details.

What's Included

  • Atlas 11.5 ft. Square Centerpost Umbrella
  • Protective Cover
  • Base Weight Options
    • 415 lbs Infinity Steel Base 
    • Titan Steel Base 
    • 340 lbs Z-Plate with or without Wheels 
  • Mounting Kit Options
    • Concrete Mount Kit 
    • In-Ground Mount Kit 

Bases and Mounting Kits Explained

Choose the right support system to keep your Patio Umbrella stable and secure in any setting. Opt for a permanent mount kit for a secure, fixed installation or a freestanding base for flexibility and easy repositioning.

Check the Base Weight Matrix for the recommended base weight and alternative options. 

Infinity Base


Item No:  | Weight: 415 lbs.

Size: 44.5” x 44.5" x 1.8"

Finish: Shadow Graphite, Architectural Bronze, Arctic White, and Sand

Galvanized Steel Frame + Aluminum Lid, Galvanized Steel Plates

Check Product Page HERE


Titan Base


Item No: BGT850 | Finishes: Shadow Graphite, Architectural Bronze, and Arctic White

Weight: 118.1 lbs. | Size: 40.5" x 40.5" x 6.4"   

Galvanized Steel Frame + Aluminum Lid

Accommodates (32) 12″x12″x1.5″ pavers (Not Included).

Check Product Page HERE


Z-Plate

Z-Plate with Wheels


Note: You need a set of (1x) ZB115 and (1x) ZB225 Z-Plates for Atlas 11.5' Square. 

Check Product Pages HERE: ZB115 and ZB225

Total Weight: 340 lbs

Finishes:  Shadow Graphite, Architectural Bronze, Arctic White, and Sand

--

Can be purchased with Wheels (ZBWH-LG)

Weight: 6.61 lbs. | Diameter: 4"

Concrete Mounting Kit 


Plate Dia. - 8.46" | Thickness - .63" | Weight - 7.76 lbs

Includes: Adapter plate and expansion bolts.


In-Ground Mounting Kit


Plate Dia. - 8.46" | Thickness - .63" | Weight - 6.62 lbs

Includes: In-ground fitting


Product Specification

Below are the key dimensions of the Atlas 11.5' Square Centerpost Umbrella.

Key Description ATL-35S

Canopy Shape
Square
Coverage 131 sq ft
Ribs 8
Size 11.5 ft | 3.5 m
A
Lower Hub Height (Open)
7’ ft | 2.1 m
B
Rib End Height (Open)  
7’ 4” ft | 2.2 m
C
Canopy Length (Diagonal)   
16’ 3” ft | 5.0 m
D
Canopy Width
11’ 6” ft | 3.5 m
E
Overall Height (Open)
8’ 10” ft | 2.7 m
F
Overall Height (Closed)
11’ 6” ft | 3.5 m
G Rib End Height(Closed) 3’ 3” ft | 1.0 m
H Height to Crank Handle 3’ 4” ft | 1.0 m

Min. Base Weight 300 lbs

Product Resources

For more information on specifications, manuals, warranty, technical sheets, and maintenance, refer to the following resources:

Shipping & Returns

We ship across the contiguous United States. Shipping to Alaska and Hawaii may be available on request.

Estimated delivery timing is shown above for each product.

Smaller items ship via parcel carriers. Larger items are delivered curbside or via scheduled freight.

Optional services such as inside delivery & package removal, and assembly may be available at checkout.

Returns are accepted within 30 days of delivery for eligible items.

Please note:

  • Umbrellas and related accessories are non-returnable unless faulty or damaged
  • Select large furniture items are not eligible for return once shipped unless faulty or damaged
  • Large items may incur return shipping and handling costs

For full details, please see our Shipping and Returns & Refunds policies.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

More from our customers

★★★★★

Beautiful quality and exactly as described. The team helped confirm sizing and delivery details, and everything arrived smoothly. It completely elevated our outdoor space.

Homeowner
Texas
★★★★★

Fast quoting, clear lead times, and a genuinely helpful team. Patio Pelican makes specifying premium outdoor pieces straightforward, which is invaluable when projects are moving quickly.

Interior Designer
New York
★★★★★

Reliable communication and professional logistics. We needed a high-end solution on a fixed timeline, and Patio Pelican helped us select the right options and coordinate delivery smoothly.

Hospitality Project Lead
Florida
Recently viewed