![9" height T3000 foundation wrapped in organic cotton. Shown here in our Sherwood Park location]()
![A close-up of the GOTS Certified 97% Organic Cotton fabric]()
![Cora flippable mattress w/ Spring Air organic slat foundation. On display in our Sherwood Park showroom]()
![Sandcastle Foundation]()
![Sandcastle Foundation]()
![Sandcastle Foundation]()
![Sandcastle Foundation]()
Sandcastle Foundation
Organic Cotton Upholstered Boxspring
Sandcastle Foundation - Twin/Single (38 x 74") / 9" | 23 cm (Standard) is made to order or backordered. Please review our availability & lead times section for details.
Local Delivery or Pickup Only on all Spring Air
Local Delivery or Pickup Only on all Spring Air
Note: The Sandcastle Foundation is available for local delivery (Calgary & Edmonton areas) or for pickup at one of our stores or warehouses. Delivery outside of our local area is unavailable.
Select best-selling variants held at our Calgary and St. Albert Warehouses; we specialize in white-glove local delivery. The Sandcastle Foundation is available for local delivery or pickup only.
Stock levels are updated frequently but are not real-time. Once availability is confirmed, in-stock orders are shipped/ready for pickup within 1-2 business days.
Standard Sizes | Custom Sizes | Uncommon Sizes | European Sizes
| Width x Length | |||
| Crib | 28 x 51" | 71.1 x 129.5 cm | |
| Half Queen | 30 x 79 ½" | 76.2 x 202 cm | |
| Twin/Single | 38 x 74 ½" | 96.5 x 189 cm | |
| Twin/Single Extra Long (XL) | 38 x 79 ½" | 96.5 x 202 cm | Also known as "Twin Long" |
| Double/Full | 53 x 74 ½" | 134.5 x 189 cm | Also known as "Standard" |
| Queen RV | 60 x 74 ½" | 152.5 x 189 cm |
RV mattresses are typically this size |
| Queen | 60 x 79 ½" | 152.5 x 202 cm | |
| King RV | 72 x 79 ½" | 183 x 202 cm | Gaining in popularity in RV's |
| California King (Western King)1 | 72 x 84" | 183 x 213 cm | |
| King (Eastern King) | 76 x 79 ½" | 193 x 202 cm | Standard Canadian & American King |
1 - Although California King is available in Canada, this size only represents a small portion of our king mattress sales.
Nearly all mattress sizes are rounded up. For example a Twin bed in real-world dimensions is usually 38 x 74" or a Double is 53 x 74". Queen and King are almost always 79 inches long. Most mattresses today are still primarily hand made, which will always lead to variances. Foam mattresses tend to adhere to sizing guidelines more accurately than spring mattresses.
Square, rectangle, round, cut corners to fit antique four poster beds, we're well-suited to work with our manufacturing partners to provide these unique requirements. Our handcrafted luxury natural mattress range from Berkeley Ergonomics, Harrison Spinks, and t•masc (made in Ottawa by Obasan) allows for just about any possibility.
Our custom mattress category is an excellent starting point for obtaining ideas and approximate pricing on special sized natural mattresses.
Our partner suppliers are able to craft a mattress in just about any of these uncommon mattress dimensions. Be sure to check out our custom mattress category as a starting point to source these sizes.
| Old Style Single2 | 36 x 72" | 91.4 x 182.9 cm |
| Twin/Single Waterbed | 36 x 82" | 91.4 x 208.3 cm |
| Half California King | 36 x 84" | 91.4 x 213.4 cm |
| Supersingle (3/4) | 47 x 74 ½" | 119.5 x 189 cm |
| Supersingle (3/4) Extra Long (XL) | 47 x 79 ½" | 119.5 x 202 cm |
| Supersingle Waterbed | 47 x 82" | 119.4 x 208.3 cm |
| Double/Full Extra Long (XL) | 53 x 79 ½" | 134.5 x 202 cm |
| Queen Waterbed | 58 x 82" | 147.3 x 208.3 cm |
| California Queen3 | 60 x 84" | 152.4 x 213.4 cm |
| King Waterbed | 70 x 82" | 177.8 x 208.3 cm |
| Alaskan King | 108 x 108" | 274.3 x 274.3 cm |
Note, sizing may vary dependent upon the manufacturer.
2 - 36 x 72" was a common size in the middle part of the 20th century. It is no longer a standard size.
3 - California Queen was used primarily as a replacement for wood-framed water beds and is nearly obsolete.
This table lists the European sizes we most frequently source for our customers here in Canada. Our TEAM 7 European Platform Beds are available in most of these sizes.
| Width x Length | ||
| EU - Single/Twin | 90 x 200 cm | |
| EU - Single Extra Long | 90 x 210 cm | |
| EU - Small Double | 120 x 200 cm | |
| EU - Double | 140 x 200 cm | |
| EU - King | 160 x 200 cm | |
| EU - Grand King | 180 x 200 cm | |
| NL - Extra-Large Double | 200 x 210 cm | TMASC King |
| UK - King | 152 x 198 cm | 60 x 78" |
| UK - Queen or Super King | 183 x 198 cm | 72 x 78" |
Visit our European & British Mattress & Bed Sizes page for more details.
About Discrepancies
It is normal for a particular mattress to not match up exactly to a size listed above. As many aspects of building a mattress are still done by hand, there will always be variations in sizing from one mattress to the next. Depending on the mattress manufacturer, deviations of 1" or more may still be considered as within the acceptable tolerance.
-
On Display @ TMASC
Spring Air is on display in Calgary, Edmonton, Sherwood Park, and Vancouver (Early 2027!)
Sandcastle Foundation Specifications
- The border fabric is 97% GOTS Certified Organic Cotton
- Quilted to 3/16" polyurethane foam
- Slatted wood top deck with 1" slat spacing
- ½" polyurethane foam padding atop the slats
- Available in 2", 4" or 9" height
- Made in Canada
Included with all TEAM 7 bed frames
The 2" (5 cm) Spring Air foundation is included at no extra cost with all TEAM 7 beds and serves as the breathable support structure for use with any high-performance mattress.
All About the Sandcastle Foundation
About TMASC
About TMASC
ClickTap to Close the Availability & Lead Times tab
ClickTap to Close the Availability & Lead Times tab
Calgary Edmonton Sherwood Park Usually available for immediate collection at our Alberta galleries or prompt nationwide dispatch.
Calgary Warehouse Edmonton Warehouse Regularly held at our regional distribution centres; we specialize in white-glove local delivery, immediate collection, and nationwide freight. Learn more about our furniture & mattress delivery.
Regularly Stocked Sandcastle Foundation Variants
Twin XL (38 x 80") / 9" | 23 cm (Standard)
Twin XL (38 x 80") / 4" | 10 cm
Twin XL (38 x 80") / 2" | 5 cm (for platform beds)
Double/Full (53 x 74") / 9" | 23 cm (Standard)
Queen (60 x 80") / 9" | 23 cm (Standard)
Queen (60 x 80") / 4" | 10 cm
Queen (60 x 80") / 2" | 5 cm (for platform beds)
Split King (2 Twin XL Side-by-Side) / 9" | 23 cm (Standard)
Split King (2 Twin XL Side-by-Side) / 4" | 10 cm
Split King (2 Twin XL Side-by-Side) / 2" | 5 cm (for platform beds)
Sandcastle Foundation Lead Times
If a specific variant isn't listed as 'Regularly Stocked,' it is made to order just for you. Please allow 2-4 weeks for Spring Air to produce and prepare your selection for dispatch.
On Display/Samples In-store
The Sandcastle Foundation is available to experience in-person (as a display model or physical sample) at these store locations: Calgary, Edmonton, and Sherwood Park.
Inventory Notice
Stock levels are updated frequently but are not real-time. Final availability and lead times will be confirmed at the time of order processing. Our team is available to assist with availability and lead times. Call us toll-free at 1-877-750-1212.
-
![Independent support for each sleeper, and fully adjustable for different body types]()
-
![]()
Metal Bed Frame
