Frequently Asked Questions

What distance is recommended between piles?

Generally, we recommend to keep a distance between each pile of eight (8’) to ten (10’) feet, based on industry best practices.

What load can a pile bear?

The loads or weight that a pile may carry is determined by the type of soil in which it is installed.  The denser the soil, the higher the load bearing capacity will be.

In very loose soil, the Postech installer will decide between a bigger blade or extensions (to reach denser soil) so that the necessary torques will have been reached.

While installing the last few inches of the screw pile, the trained Postech installer validates hydraulic pressure, with the help of a pressure gauge located on the excavator arm. He then can assure, thanks to a precise guide chart, the load bearing capacity of the pile.

Postech Screw Piles are recognized by the Canadian Construction Material Center and are conform to the National Building Code.

How much does a pile cost?

Postech Piles are the affordable solution to your foundation requirements. However, it is difficult to determine an exact cost since several factors must be taken into account: The structure to be supported, type of soil, length, region, etc.  We recommend you contact a Postech Dealer in your area for more details. He will be pleased to provide you with a price that includes the installation cost.

What happens when you hit a rock?

Our piles are, unfortunately, not equipped with a drilling head. However, in the overwhelming majority of cases, the installer will be able to deviate around the rock, to allow the pile to continue its descent. If the rock is really too large, and that construction parameters allow, the pile may be installed at another location. In the case where the pile must be installed in a very precise location, excavation may become necessary, but these cases are rare.

Can your piles be installed in rock?

Yes, Postech has developed a simple method that allows the anchoring of the pile to bedrock permanently.

Can the piles be installed under an existing structure?

Yes, it is possible to install the piles under an existing structure. However, the proposed location of the piles must be relatively close to the edge of the structure. If the piles must be installed in the middle of a structure, there must be an access to allow the piles to be installed. For example, in the case of a wood patio, the customer may remove some floorboards to allow installation of the piles in a precise location.

Must we leave a space between the soil and the structure?

Yes, It is very important to leave sufficient space between the soil and the structure (including trellises, stairs, etc.), to allow for heaving of the soil due to frost. If the structure is in contact with the soil, then the pile’s usefulness is limited, because the frost will make the soil heave and move (raise) the structure.

Is it necessary to have a protective coating around the pile to guard against frost heave?

Absolutely not, the frost has no hold on the galvanized steel shaft. It is the base of the pile (blade) which acts as an anchor, and which prevents the pile moving with the frost heave. It is for this reason that the pile must be installed in such a manner so that the blade is BELOW the frost line. In fact, Postech has developed a process which prevents cold air from moving down the inside of the shaft. See section THERMAL PILES for more details.

Do Postech Screw Piles rust?

No. All Postech Piles are hot-dipped galvanized according to standard ASTM 123A. Furthermore, Postech Screw Piles have no impact on the environment.

Have performance tests been completed on Postech Screw Piles?

Absolutely, Postech Screw Piles have been tested using many required and vigorous industry standards (see section Technical Information) and are approved by the Canadian Construction Materials Centre (CCMC #13102-R). This organization is responsible for the evaluation and approval of all products that are recognized as construction materials in Canada. What this means is that Postech Piles meet high quality standards. For your protection it is very important to use piles that have been tested and approved by the CCMC. In fact, most local and state governments, as well as insurance companies request it.

My driveway has an asphalt surface, and I want to build a carport. Can screw piles be used?

Yes, it’s possible. A hole, however, must be made in the location where the pile will be installed. Afterwards, a slight touch-up of the asphalt around the pile will be needed.

Can we install the piles ourselves?

No, Postech Piles must be installed by certified installers, all of which have attended a complete training seminar, and have all the qualifications required to best guide you with your projects.

What are the advantages of a screw pile over a concrete post (sonotube® types)?

There are many advantages in using Postech Piles rather than concrete post foundations (sonotubes ®). Consult section Why choose Postech piles for more details.

Must we complete certain verifications prior to having screw piles installed on our property?

What’s important is that you know if there are certain installations buried on your property at the locations where you wish to have screw piles installed, (water main, electrical cables, sewer, gas main, or all other underground installations). If you do not know what installations are buried on your property, it will be difficult for our installers to know. Please check with your local (town or city) municipal government for location of underground installations.

My property has a slope, can you still install piles?

Yes! We can do the installation in almost all types of terrain. Contact us to determine whether we need specialised equipment for your specific case.

Is a warranty offered?

Yes! All our piles are guaranteed against manufacturing defects. In addition, your Postech certified installer provides an installation warranty against movements due to frost.

How long does a pile last for?

The lifespan of a pile depends on the type of soil where the Screw Pile is installed and it’s chemical properties (pH, humidity, etc). Under normal use in a average soil you can expect about 75 years.