There are several factors must be taken into consideration in preparation of any work, or projects as simple as an asphalt paving. There are many people or companies whom they call themselves a professional. These professionals either have some type of technical background, or studied to become a professional, at technical (trade) school, college, or university level. These technical backgrounds must be involved with several year work of experience. Inquire, and ask these questions from your contractor. Ask the credentials, and inquire about their licence with RBQ, or Consumer protection association of Quebec, or any government related associations. What are their specialities in, how many fields of speciality? Does not mean that having an RBQ licence you could do any work, each field requires a special number and permit. Being a member of non governmental association does not mean the contractor is specialized, or has the expertise. Today paying any fees to an association you can become a member of that association, regardless of your credentials and expertise. As long as, they have name of few references, and dues are paid, and contractor has settled their differences with the clients, they can have membership. Every contractor has hopefully few good references, but what about those clients, that you don’t know!
We at Pavcan Construction Inc. believe all professionals in this field must know the soil consistency and land drainage in order to be able to make a sound judgment on the depth of excavation or backfill materials, either for compaction or drainage purpose.
Also one must be very clear about (Settling) or (Compaction). Settlement does not necessarily means ground is well compacted. Compaction is obtained only by adding a certain quantity of water while compressing the gravel (0-3/4) or compaction sand. The common compaction is at 95% Proctor density. Also compaction must be done variable gravel thickness depending on the type of compaction machinery. Where as, settling mainly happens on an area of deep excavation, like newly constructed residence, near foundation area, and or where the water main is installed.
There are several type of soil which commonly knows as Sand, Silt, Clay, and Loam, where each of these behave differently with weather fluctuation and excess humidity (water content). The most unstable of these four are Clay and Silt, which care must be taken into excavation and preparation of sub-base. Most common way of protecting the heaving, or frost movement and stabilization of the base is by installing Geotextile or Membrane. Or in case of deep excavation or structural construction soil bearing capacity must be determined by soil test with a recognized testing lab.
Drainage is also one of the most important aspects of landscaping or construction. Surface drainage is the best way of sloping the land or any structure. Under ground perforated drain is helpful where is possible. Any perforated pipe (French Drain) installation at less than 2 feet below ground, eventually with heave and push upward. If there is no slop to evacuate water, do not install drains to no where. Do not connect your roof gutters or surface runoff to your foundation French drains. In some municipalities this is illegal, and also many insurance companies do not insure you in case of flooding.