BALI PREFAB WORLD has developed a special system and technique to have our models safely built over water, either in lakes or coastal waters. Our senior in-house Civil/Hydraulic and Geotechnical engineer with 50 years of International experience under his belt may help and advise you on the required piling, piling depth and super structure. In order to safely determine the pile capacities one need to take into account the pile's end bearing capacity + negative or positive friction along the pile shaft. This will define the safe pile driving depth. Waves have minor influence on piles, however, it needs to be investigated if wave run up caused by cyclones need a special superstructure. Our company would be happy to prepare a quotation for the engineering works for your over water project, even when you will not order one of our units. Pile structures can be made from either concrete, steel or wood. the latter being the cheapest.
Properly employed timber marine piles are a long term, low cost, environmentally sustainable solution. They do not corrode and proper treatment protects them from environmental degrade mechanisms such as marine borers and rot. They do not require expensive cathodic protection systems or expensive coating systems to provide them with adequate service life, but they will benefit from wrap or a PVC tube encasement between the mud line and the high tide mark. If this is done the piles will outlast their counterparts with low initial cost, very low ongoing maintenance costs and wil last for > 50 years.
Piles below the mud line will not decay or be attacked by marine borers. Above the mud line and below the high tide mark (splash zone) they are susceptible to various levels of marine borer attack. This is generally classified in various standards as high hazard in salt water (coastal and some salt water rivers). In these waters we recommend a treat with a special wrap. Such treatment protects the timber from all kind or marine borers such as the most dangerous shipworm (Toredo, Bankia), the less dangerous gribble, piddocks, pill-bucks, and more.
NOTE: A number of wooden prefab manufacturers show houses built over water on their web sites. Such is true, however, none of these companies could design the over water sub-structure (piles, piling depth, capping beams, etc.), since they lacked the technical knowledge and needed to subcontract these design works to an external consultant or a contractor. Based on A and B above our company is well capable to design a fully integrated structure (the iling system and the houses) .
NOTE: In the event that you will not order an over water unit from us but only need the design for the over water substructure + piles, let us know via our contact form. Our senior civil/hydraulic engineer would be happy to help and advise. Click <here> for his credentials.