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Weepholes are a very important component of Precast Hollowcore Plank, they are critical for drainage. It is NOT recommended to leave trapped water in the cores of plank. Drilling weepholes can also help to identify water infiltration in your building.
General Contractor's should look for signs of trapped water at the lower floors of installed plank, water migrates down to lower floors this can sometimes lead to darker stained bottom finish and water droplets may be visible. This entrapped water will eventually migrate though the plank and result in damage to your finished project, much beyond the completion of your building. Entrapped water can result in damage to drywall, paint, finish materials and could potentially introduce MOLD into the building.
Don't assume your planks are not getting water intrusion because it's not "rainy-season." Water infiltration into the hollowcore plank system is a common problem and comes from many different sources which include rain, wet coring, wet saw cutting, and deck cleaning for topping placement preparation.
Ceiling Trades can immediately follow behind BRUNTCO. They no longer have to be concerned about their crews being doused with water, their equipment or their materials.
Drilling weepholes into CURED PLANK gives a clear drainage hole. A common misconception is weepholes which are Factory-installed are "the best way" to produce a clean weephole.
Many times a production weephole will require clearing, potentially could need to be redrilled once the plank is set on your building or new weepholes will need to be drilled.
Redrilling or adding additional weepholes after factory-installed weepholes fail, can add to your projects budget.
Factory installation leads to weepholes becoming obstructed with loose material when curing.
It's a mistake to assume that after rainy season you do not need weepholes. Water becomes trapped in plank cores from jobsite conditions such as wet coring or wet concrete cutting. Or water may still be trapped in the planks from rainy season.
Concrete is a porous material, hollowcore planks by themselves are not waterproof. Planks must be protected from water exposure during your project, not only will they absorb rain but water from wet core drilling and cutting. The upward camber of the plank at the midspan, causes the water to drain toward the bearing end of the plank and settles there. That water is entrapped and needs to be eradicated, via a weephole.