In wet areas where accepted footings cannot be used, engineers can institute a series of wooden pilings or posts that will preserve a buildings which otherwise could not be built there using regular construction methods. Large pilings can range from twelve inches in diameter or more and be thirty, forty, fifty or even a hundred feet long or more. The institute is based on the soil type. Obviously piles of that size must be installed by a pro using a pile driver. We have all seen a driver sitting somewhere and heard the well-known thump noise they make, as the hammer strikes the top of the pile driving it further and further into the earth with each hit. The hammer will at last not be able to drive the pile any further and at the point it is called refusal. Any way smaller projects for a deck or a shed maybe are within the scope of a homeowner. Using accepted excavation equipment such as a backhoe to excavate the holes and set the pilings, a construction may be built where otherwise it would not.
A homeowner can get ready made pilings from their local utility business and in most cases for free. The utilities constantly turn their poles either for power line upgrades, damages and so on. The old poles must be disposed of so they are glad to give them away. The end corollary is you get the poles for free. A small contractor with a tag-a-long trailer can certainly load and carry them to your site. Once at the site the four best and straightest poles should be selected for the corners of your building. The others for internal supports are not quite as critical.
If the new buildings is wooden, it may be built right onto the new pilings in a pole barn manner. If the buildings is concrete or masonry, pile caps may need to be poured and we will cover these in a moment. By excavating the holes and placing the piles by hand you are not getting the same type of adhesion you would by using a pile driver. New soils must be used and be compacted as it is located nearby the poles. Many designs call for over filling the holes by several feet and then allowing a set time period to expire before any construction can begin. This added weight of soil above the accomplished pile helps compress the soils nearby the piling. Once the time period expires, the excess soils can be removed exposing the top of the pilings. This time period can last for months but can also be years.
The pilings at this point would all be cut off level with one other at ground level height. By installing a perimeter rim joint, bolted to the piles and a series of floor joists, you now have a foundation or base to build your buildings upon. In very wet areas where some pile movement is expected, extra wall and roof connections are required called slip joints to allow the walls to move with the pilings. The movement is commonly dinky but if the walls were affixed solid, cracks would appear in accomplished surfaces.
If your construction is to be built of concrete or masonry you will have to install concrete pile caps to carry the weight of the concrete footings and walls. In these cases, piles are located adjacent to each other in pairs and are then connected together with a concrete beam or cap. Once all the caps are in place, then the regular footings can be built spanning from cap to cap for support. Once all the footings are in place the walls can amble from there. This is not work for the midpoint homeowner to attempt.
Pilings are used anywhere today. Bridges over water, fishing piers into the ocean, and many high rise buildings sit on piles today. Using piles for your project may allow use of land that otherwise would sit empty.
Pete Ackerson
Your kindly construction Inspector
http://www.Wagsys.com
Bices-Building Inspection & Code promulgation law software
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