JONATHAN MCNABB, APPELLANT,

v.

TAYLOR ELEVATOR CORP.; BAY VILLAGE CLUB CONDOMINIUM ASSOCIATION, INC.; AND D.G. SUITOR & ASSOCIATES, INC., APPELLEES

KHOUZAM, Judge.

Jonathan McNabb appeals the final summary judgment entered in favor of Taylor Elevator Corp. We reverse.

The dispute in this case arose after McNabb slipped and fell near an elevator on the premises of Bay Village Club Condominium Association, Inc. Bay Village owned the premises but contracted with Taylor Elevator Corp. to maintain its elevators. At some point prior to McNabb’s fall, a Vietaulic seal in the elevator machinery broke and leaked oil into the machine *185room and out into the hallway. McNabb slipped and fell on the oil, injuring himself. Darren Gulmy, an elevator service technician, serviced the leak after McNabb’s fall. In his deposition, Gulmy stated that the Victaulic seal was leaking at a rate of a drip every two seconds. He also testified that the oil on the floor of the machine room was a quarter-inch deep.

McNabb filed suit alleging that Bay Village and Taylor Elevator were negligent for failing to properly maintáin the elevator and surrounding area. Bay Village and Taylor Elevator moved for summary judgment. Taylor Elevator submitted evidence showing that three days prior to McNabb’s fall, it had inspected the elevator machinery, including the Victaulic seal. The inspectors testified in their depositions that the seal was not leaking at time of the inspection. In opposition to Taylor’s motion for summary judgment, McNabb submitted the affidavit of Dr. Charles Benedict, a mechanical engineering expert. In his affidavit, Dr. Benedict opined, in pertinent part, that the Victaulic seal had been leaking between four-and-a-half to eighteen days. He based this opinion on the flow rate of the oil leaking from the seal as observed by Gulmy, drip tests based on Gulmy’s description, the depth of the oil observed by Gulmy, and the dimensions of the machine room.

The trial court granted Taylor Elevator’s motion for summary judgment.1 In doing so, it discounted Dr. Benedict’s affidavit:

I’m going to discount this affidavit of Charles Benedict, because I' don’t believe it’s based on any actual facts. To me this is just really more in the line of pleading because he’s saying theoretically speaking, et cetera, et cetera, et cet-era. And [Taylor Elevator has] a ton of evidence that indicates that three days before this slip and fall there was nothing on the floor. It was inspected, there [were] no problems that anybody could see.

On appeal, McNabb argues that the trial court erred in granting summary judgment in favor of Taylor Elevator because Dr. Benedict’s affidavit created a material issue of fact.2 We agree.

“This court reviews de novo a trial court’s decision on a motion for summary judgment.” Bernhardt v. Halikoytakis, 95 So.3d 1006, 1008 (Fla. 2d DCA 2012). The burden is on the moving party “to come forward with competent evidence to demonstrate the nonexistence of a material issue of fact.” Id. Supporting or opposing affidavits must set forth facts based on personal knowledge “as would be admissible in evidence.” Fla. R. Civ. P. 1.510(e); see also W. Edge II v. Kunderas, 910 So.2d 953, 954 (Fla. 2d DCA 2005). Once a movant meets his or her initial burden, the burden shifts to the opposing party to come forward with evidence to the contrary. First N. Am. Nat’l Bank v. Hummel, 825 So.2d 502, 503 (Fla. 2d DCA 2002). In ruling on the motion, the trial court is precluded from weighing the evidence. 4 Corners Ins., Inc. v. Sun Publ’ns of Fla., Inc., 5 So.3d 780, 784 (Fla. 2d DCA 2009). “[T]he merest possibility of the *186existence of a genuine issue-of material fact precludes the entry of final summary judgment.” Id. (alteration in original) (quoting Nard, Inc. v. DeVito Contracting & Supply, Inc., 769 So.2d 1138, 1140 (Fla. 2d DCA 2000)):

Although Taylor Elevator produced evidence tending to show that the Victaulic seal was not leaking at the time of its inspection three days before McNabb fell, Dr. Benedict opined that the oil must have' been leaking for four-and-a-half to eighteen days prior to the accident. This conflicting evidence created a material issue of fact. The trial court erred in finding that Dr. Benedict’s affidavit was not based on any facts. Dr. Benedict’s conclusions as to the duration of the leak were based on a drip test, Gulmy’s observation of the drip rate, the depth of the oil as described by Gulmy, and the dimensions of the machine room.3 Moreover, the trial court improperly weighed the evidence when it discounted Dr. Benedict’s affidavit and reasoned that Taylor Elevator had a large amount of evidence indicating that the seal was not leaking at the time of the inspection. Accordingly, we reverse the summary judgment entered in favor of Taylor Elevator and remand to the trial court for further proceedings consistent with this opinion.

Reversed and remanded.

VILLANTI, C.J., and SALARIO, J., Concur.