delivered the opinion of the court:
Claudette Dyback, the plaintiff, filed suit in the circuit court of Lake County against Arthur J. Weber and Francis E. Weber, d/b/a Weber Construction Company, following a fire that damaged her home. She alleged that the fire was caused by the negligence of the defendants in leaving a fuel-oil heater on the premises where they were making repairs and, alternatively, in a second count that the defendants were liable under the doctrine of res ipsa loquitur. The third count of the complaint alleged that the defendants had failed to perform repairs in a good and workmanlike manner. The trial judge, at the close of the plaintiff’s case, directed a verdict in favor of the defendants on all counts under Pedrick v. Peoria & Eastern R.R. Co. (1967),
The plaintiff hired the defendants, who are in the home-construction business, to make repairs on her home in Prospect Heights, after it had been damaged extensively in a firе caused by lightning. The second fire, which is the basis of this lawsuit, occurred about 3 a.m. on December 28, 1978. This second fire caused even greater damage than the previous one, and eventually the house was razed.
The plaintiffs house was unoccupied while it was being restored by the defendants and had only limited electrical service and was without gas service. The defendants used a portаble tubed-shaped “salamander” fuel-oil heater in the area where they were working. One of the defendants, Arthur J. Weber, who was called as an adverse witness under section 2 — 1102 of the Code of Civil Procedure (Ill. Rev. Stat. 1985, ch. 110, par. 2 — 1102), testified that only one electrical outlet, located in the dining room on the first floor of the house, was working. He and Francis, his brother, would plug the heater into the live outlet and, using an extension cord, were able to move the heater from room to room. The Webers used fuel-oil cans to fill the nine-gallon heater but did not leave the cans on the premises. The Webers were at the house on December 27, 1978, the day before the fire, but had not used the heater that day because they worked only about one hour. Weber could not recall if he or his brother had unplugged the heater the last day they had used it but said it had been moved to the back bedroom on the first floor after working hours so that it could not be seen through windows in the front of the house. The evidence showed that the defendants used a set of keys provided by the plaintiff, who had instructed them to lock the house when leaving.
The record shows that after the second fire the plaintiff hired Russell & Associates to investigate the fire. Ken Schultz of the firm, after detecting the odor of accelerants in the house, took four samples of substance found on the floors and one sample from the heater. A chemical analysis of the samples indicated the presence of naphtha, an accelerant, in the attic and of a fuel oil in the sample taken from the heater in the bedroom. No other accelerants were present in the three other samples taken from areas of the first floor. Schultz observed in his report, however, that the burn pattern he found on the first floor of the residence led from the front door to the bedroom and kitchen. He concluded that the fire had been set by some unknown person.
James Miller, a licensеd public adjustor, testified as an expert for the plaintiff. He was qualified as an expert on causes and origins of fires and the valuation of losses produced by fires. Miller had inspected the plaintiff’s house only in January 1980, more than a year after the second fire. His inspection was conducted solely from the exterior of the house. Although he conceded that he did not know the cause of the fire, he stated his opinion that the fire would not have occurred if the heater had not been on the premises. He also said, based on Schultz’ report, that there were two separate and simultaneous fires, one in the attic and the other on the first floor. Miller also gave the opinion that the fire did' not originate in the room in which the heater was located. Miller theоrized that the reason the chemical analysis of the three floor samples taken by Schultz did not indicate the presence of accelerants was because the fuel oil had burned about 99.9 percent pure, leaving no hydrocarbon residue behind that would be detected in a chemical analysis. Miller concluded that the fire was not caused by arson because there wаs no indication of a forcible entry into the house. In reaching his opinions, he relied extensively on the investigation of Schultz, who died during the pendency of the lawsuit. He referred, too, to an investigation by the local fire department conducted almost immediately following the fire. That report concluded that the heater was not the cause of the fire because it was not pluggеd into the electrical outlet, and that the fire did not originate in the bedroom where the heater was located.
The plaintiff’s complaint of negligence was grounded solely on the defendants’ bringing the heater to the house and leaving it there, rather than removing it at the end of each workday. The plaintiff showed that the heater could have been moved by one person with little diffiсulty.
At the conclusion of the plaintiff’s case, the trial court granted the defendants’ motion for a directed verdict on all counts. The court stated that the opinion of the plaintiff’s expert was based on guess and conjecture and held that the simple leaving of the heater in the house did not constitute negligence.
The appellate court in its opinion, though the question had not bеen raised in the trial of this case, stated that one of the elements for invoking the res ipsa loquitur doctrine has been abrogated by this court’s adoption of pure comparative negligence in Alvis v. Ribar (1981),
We consider that the appellate court here correctly concluded that a plaintiff’s freedom from contributоry negligence should no longer be a requirement in order to make out a prima facie case under the doctrine. At least five other comparative fault jurisdictions have considered the question and have decided that proof of a plaintiff’s freedom from negligence is no longer required under res ipsa loquitur. (See Tipton v. Texaco, Inc. (1985),
The defendants argue thаt, since the plaintiff in a res ipsa loquitur situation is given the benefit of an inference of general negligence, it is appropriate to continue requiring the plaintiff to show his freedom from negligence. They argue that the doctrine, founded on an inference of general negligence, differs so significantly from specific negligence cases that comparative fault should not аpply to the former. We disagree because “[t]he analysis, from the viewpoint of comparative negligence, focuses on whether a ‘defendant’s inferred negligence was, more probably than not, a cause of the injury *** though [the] plaintiff’s [or third party’s] negligent acts or omissions may also have contributed to the injury’ ” Tipton v. Texaco, Inc. (1985),
Since this court has extended the principle of comparative negligence to other areas (Coney v. J.L.G. Industries (1983),
The defendants contend that the appellate court did not apply the proper standard when reversing the trial court’s order directing a verdict for the defendants on the res ipsa loquitur count. Specifically, the defendants argue that the appellate court did not consider the explanatory and contradicting evidence of arson, which it should have done in considering a motion for directed verdicts under Pedrick v. Peoria & Eastern R.R. Co. (1967),
The only ground for claiming negligence that the plaintiff alleged was that the defendants left the salamander heater in the plaintiff’s house overnight, rather than removing it after each day’s work. Without this, the plaintiff’s argument continues, a fire ordinarily would not have occurred in an unoccupied house without gas service and with only limited electrical service. We consider the trial court correctly held that the plaintiff did not prove the first element of the res ipsa loquitur count — that is, that the fire ordinarily would not have occurred in the absence of negligence. As other courts not surprisingly have concluded, fires frequently have сauses other than negligence, as when lightning struck this plaintiffs house, causing the first fire, or when arson occurs. (Allstate Insurance Co. v. Winnebago County Fair Association, Inc. (1985),
Too, the plaintiff presented no evidence that it is the custom and practice in the housing-construction trade to remove heaters of the type here from the wоrk site at the end of the workday. The plaintiff’s expert, Miller, was qualified to testify as to origins and causes of fires, along with valuations of resulting losses, but he was not qualified to offer opinions on the duty of care owed by home-construction contractors’ use and maintenance of heaters of the type here, and he offered none. An expert witness’ opinion cannot be based on mere conjecture and guess. (Hahn v. Eastern Illinois Office Equipment Co. (1976),
Plaintiff refers us to several decisions involving fires in which the res ipsa loquitur doctrine was held applicable, but all are distinguishable because there were other surrounding circumstances beyond the fire itself to support an inference of negligence. (Schurgast v. Schumann (1968),
For the reasons stated, the judgment of the appellate court reversing the trial court’s judgment as to the res ipsa loquitur count is reversed and the appellate court’s judgment affirming the trial court’s judgment as to the negligence count is affirmed.
Appellate court affirmed in part and reversed in part; circuit court affirmed.
