Diamond Pier Systems
LIFT ® Low Impact Foundation Technology
To Order Call (253) 858-8809 or see www.pinfoundations.com.
|The Pin Foundation Advantage:
A solid foundation that reaches deep into the ground without digging holes! Installation is simple. The precast concrete head is installed at the ground surface and pre-determined lengths of pipe are slid through receiver holes cast in the concrete and driven into the ground using simple hand tools.
This is the best way to install a reliable and durable foundation that will last the lifetime of your structure. Any penetrable, native soil or compacted fill can be accommodated - even frost, expansive or saturated soils.Applications
The Diamond Pier™ can support just about any structure that will connect to a post or beam bracket. Deck, porches, carports, walkways, ramps, stairs, gazebos, sheds, additions - you name it!
Diamond Pier's lightweight components and ease of installation makes it the first choice for any project. Set the pier, drive the pins, connect the bracket, and start building. It is that easy.
Diamond Piers are ideal in areas not suitable for traditional construction methods. They are often a good solution on sites deemed unbuildable due to poor soils, wet conditions, or environmental sensitivity. Diamond Piers are installed using only hand tools with minimal disturbance to native vegetation, and the piers are fully removable, also making them great for temporary installations.
The Diamond Pier™ foundation is frost and heave resistant. The unique pointed base of the concrete combined with the pins set deep into the ground work together against heaving action. Since there are no large flat surfaces to push against and the pins resist the upward movement of the pier, the soil takes the path of least resistence and cleaves around the pier.
Pin foundations are pre-engineered systems. Their load capacity is determined from the soil information specific to each site. Selecting the right foundation system for your site is dependent on this capacity and the aesthetic and structural considerations of your project (see project planning).
Another unique feature is that multiple piers can be used in tandem to carry heavy loads, and the piers can be placed in close proximity to one another without pin interference, provided the piers are set in line with one another and are oriented in the same direction.
Diamond Pier DP-50 Diamond Pier DP-100 Other Product Brochure Product Brochure Inspection Tips Installation Instructions Installation Instructions Driving Hammers Specifications Specifications Details Details Frost & Expansive Soils
Diamond Pier™ come in two sizes: The DP-50 and the larger DP-100, which offers a maximum load rating of 4000lb and 8000lb respectively. Both versions are light enough to hand carry to your site and utilize the same three components as described below:
|Precast Concrete Connector
Precast concrete with air entrainment and fiber reinforcement for durability and strength. An anchor bolt cast into the top of the pier works with a variety of common post or beam connectors. The DP-50 is 10” square at its midport and 11” in height and weighs approximately 50 pounds; while the DP-100 is 13" square at it's midpoint and 14" in height and weighs approximately 100 pounds.
|Steel Bearing Pins
The pins are galvanized schedule 40 steel pipe for long-lasting corrosion resistance and are cut to a specific length as required. The DP-50 utilizes 1-inch nomial (1.315 actual) outside diameter, while the DP-100 utilizes 1 1/2 -inch nominal (1.900 actual) outside diameter pipe. The length of pipe depends on your project's requirements.
Injection molded caps are placed over the exposed ends of the pins after they're driven into place. The cap serves to prevent water infiltration into the pipe and to provide a finished appearance.
A pin foundation can be used virtually everywhere, but there are a few considerations during the planning phase.
Most importantly, check for buried utilities and layout the piers to avoid contact. Make sure the piers are located far enough away from visible obstructions leaving enough room around the pier to drive the pins. Likewise, subsurface structures (like foundation walls) need to be identified so piers are set far enough away to allow full penetration of the pins without interference. Vegetation in the area with significant roots can be avoided by spinning the pier so the pins miss large roots.
Diamond Piers™ can accommodate sloping sites, but slopes greater the 2:1 make it difficult to install Diamond Piers™ because the dowhill pin can't get much of a bite into the soil. It is possible to dig the pier into the hillside to improve the cover on the downhill pin, but then the upside of hill needs to cut back enough to facilitate the installation of the pins.
The Diamond Pier will work in many soil types including clays, silts, sands, and small gravels. Roughly speaking, clays and silts are small particles that feel smooth and greasy and tend to stick together, while sands and gravels are larger distinct rounded particles that can be seen and will pour out of your hand as individual particles. These properties affect the bearing capacity of our Diamond Pier. For Small projects, our DP-50 bearing chart will help select the right pin lengths based on what soil type you have. It is helpful to know your local frost depth, because some jurisdictions require longer pins than are needed for bearing in order for the pin tips to extend below the frost line.
It's important to identify the soil within the typical pin depth - typically 2 to 5 feet below the ground surface - but need not involve a testing lab or expensive coring equipment. Generally one or two observations will suffice for a small project, unless the project is very long, like a boardwalk, where a site profile may be required to determine varying pin lengths along the length of the project.
For high capacity projects using DP-100 piers, or projects in poor soils, a geotechnical evaluation may be required. Most local geotechnical engineers can make these determinations with a single field visit, or be able to determine the information from regional soil surveys or previous soils studies done on site. For Pin Foundations to determine load capacity, your engineer must provide us a general description of the soil, along with its angle of internal friction (phi angle), cohesive strength (if applicable), unit weight, and any issues regarding local water tables or flowing water near the piers.
The pier capacity developed in the soil will determine the spacing for individual Diamond Piers at post or beam locations. These spacing are determined from framing layouts where the dead and live loads are distributed to the piers expressed as pounds per linear foot on beams and point loads for posts. Calculate the weight of the structure itself (dead load) and the live loads the structure is meant to carry like snow, people, hot tubs, etc. Some regions have special requirements such as snow or wind loads. Tall posts require adequate bracing to prevent side sway. Some structures, such as additions, may require more in-depth analysis for the proper spacing of Diamond Piers.