Here are the most frequently asked questions about our screw piles. And you, what’s your question?
Generally, we recommend keeping each screw pile eight (8’) to ten (10’) feet apart, based on industry best practices.
The load or weight that a pile can carry is determined by the type of soil in which it is installed. The denser the soil, the higher the load bearing capacity.
In very loose soil, your Postech installer will decide between a bigger blade or extensions (to reach denser soil) so that the necessary torques are achieved.
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. They then can assure, using a precise guide chart, the load bearing capacity of the screw pile.
Postech Screw Piles are recognized by the Canadian Construction Material Centre and conform to the National Building Code.
Postech Screw 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 being supported, type of soil, length, region, etc. We recommend you contact the Postech dealer in your area for more details. They will be pleased to provide you with a price that includes installation.
Our piles are 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 screw pile to continue its descent. If the rock is really too large, and if construction parameters allow, the screw pile may be installed at another location. In the case where the screw pile must be installed in a very precise location, excavation may become necessary, but these cases are rare.
Yes. Postech has developed a simple method that allows the permanent anchoring of the screw pile to bedrock.
Yes. However, the proposed locations of the screw 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 access to allow the screw piles to be installed. For example, in the case of a wood patio, the client may need to remove some floorboards to allow installation in a precise location.
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.
Absolutely not. The frost has no hold on the galvanized steel shaft. The base (blade) acts as an anchor and prevents the screw pile from moving with the frost heave. That’s why the screw pile must be installed 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.
No. All Postech Piles are hot-dipped galvanized according to standard ASTM 123A. Additionally, Postech Screw Piles have no impact on the environment.
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Absolutely. Postech Screw Piles have been tested using many required and vigorous industry standards (see Technical Information section) and are approved by the Canadian Construction Materials Centre (CCMC #13102-R). This organization is responsible for evaluating and approving all products that are recognized as construction materials in Canada. What this means is that Postech Screw Piles meet high quality standards. For your protection, it is very important to use screw piles that have been tested and approved by the CCMC. In fact, most local and state governments, as well as insurance companies demand it.
Yes. However, a hole in the asphalt must be made in the location where the screw pile will be installed. Afterwards, a slight touch-up of the asphalt will be needed.
No. Postech Screw Piles must be installed by certified installers, all of whom have attended a complete training seminar, and have all the qualifications required to best guide you with your projects.
There are many advantages in using Postech Screw Piles rather than concrete post foundations (sonotubes ®). See Why choose Postech Screw Piles? for more details.
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 any 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 municipal government for the location of underground installations.
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.
Yes! All our piles are guaranteed against manufacturing defects. In addition, your Postech certified installer provides an installation warranty against movements due to frost.
The lifespan depends on the type of soil where the screw pile is installed and it’s chemical properties (pH, humidity, etc). Under normal use in average soil you can expect about 75 years.