My 4 Star has flat aluminum sheet floor... We've not had any problems with it. It also has W.E.R.M. on top of it....

A sheet flooring and one made up with planks, both need regular inspections and maintenance, whether they are coated or bare. Werm should be inspeced for loose material and delamination. A liner material should be also be looked at, and repaired if damaged.

Both flooring systems should be regularly flushed if they are bare metal. This does not have to result in the complete removal of the mats. Most urine is confined to the curb side of the trailer in a slant load. With a plank system, this is often contained to a couple of feet from the wall. On a sheet flooring, the urine can migrate further towards the center. Many times the mats can just be rolled back in place and the flooring flushed with a hose. Leave the mats turned back until the flooring dries out.

Either aluminum system can be long lived if regularly maintained. If corrosion is noted, it should be quickly addressed to minimize any lasting damage. Liners and Werm will lessen the problems caused by urine, but they themselves are not an absolute cure. The Werm has been known to delaminate and hold moisture against the metal. The liners can be physically damaged, both allowing corrosion as a result.

Regular inspections and water flushings, will ensure a long lifespan for aluminum flooring.