Opinion of the Court by
Chief Justice MINTON.
I. INTRODUCTION.
Decades after working on projects in various premises owners’ buddings, an independent contractor’s employee developed asbestosis, the cause of which the employee claimed arose from exposure to asbestos while working in the various buildings. Assuming that asbestos exposure occurred on the premises as the employee claimed, under what circumstances can the premises owners be held liable for the employee’s disease? Did the owners have a duty to warn of the presence and potential dangers of asbestos, which at one time was used extensively in building construction but later attracted notoriety as a potential health hazard?
Some argue that these questions are answered by longstanding Kentucky precedent establishing a duty to warn only where the building owner has actual knowledge of the danger and the independent contractor had neither actual nor constructive knowledge of the danger.1 Oth[144]*144ers argue that Kentucky should adopt an approach used by other state courts, which imposes a duty to warn only where the premises owner had superior knowledge of the danger at the time of exposure.2 Still others press for more liberalized recovery afforded by the burden-shifting approach used by Kentucky courts in business invitees’ slip-and-fall cases.3
We accepted discretionary review to provide guidance concerning when a premises owner’s duty to warn independent contractors4 arises in asbestos cases and in other hidden-danger cases.5 We now reaffirm the applicability of our longstanding precedent of Owens v. Clary, decline to adopt the similar-sounding but more dispute-producing superior knowledge approach and decline to expand the burden-shifting approach as used in customer slip-and-fall cases to the present context.
Charles E. Brewster filed the case before us after he was diagnosed -with asbestosis several years ago. Brewster alleges that he was exposed to asbestos-containing building materials while performing construction work for independent contractors at Colgate-Palmolive’s plant in Jefferson-ville, Indiana, in the 1960s and 1970s and at Jewish Hospital in Louisville in the 1970s. Brewster seeks to hold both premises owners liable for his asbestosis. Apparently, Brewster never sought workers’ compensation benefits for asbestosis from his independent-contractor employers because the statute of limitations had expired for such claims.6 The trial court granted summary judgment in favor of the premises owners. We agree with the Court of Appeals that summary judgment was proper based on the lack of evidence to establish a duty to warn under Kentucky law, and we decline to reach other issues raised by the parties as unnecessary for [145]*145resolution.7 We further decline to extend the burden-shifting approach employed in customer slip-and-fall cases.
II. FACTS.
Brewster worked as a laborer for several employers on numerous worksites between 1950 and 1979. Between 1966 and 1976, Brewster worked often for Dahlem Construction, a company based in Louisville, Kentucky. While employed by Dah-lem, he worked on projects at the Colgate-Palmolive plant in Jeffersonville, Indiana, for one or more brief periods.8 He recalled tearing out various materials at the plant. He also recalled pouring concrete for a new construction project.
Between employment stints at Dahlem, Brewster worked for Wilhelm Construction Company for a period beginning in 1970. He spent all of his time working for Wilhelm at Louisville’s Jewish Hospital. He recalled tearing out old materials, including insulation for ceilings, wiring, and tanks, while a new addition to the hospital was being built. He also recalled being present when new insulation was being installed.
A back injury disabled Brewster from work beginning in 1980. In 2001, he was diagnosed with asbestosis and brought suit against numerous parties. His suit alleged negligence claims against several property-owner defendants, including Jewish Hospital and Colgate, stating that they breached duties by failing to warn independent contractors working on their premises of the presence and dangers of asbestos. Eventually, the trial court granted summary judgment in favor of Jewish Hospital on the grounds of Brewster’s failure to produce evidence of exposure to asbestos at Jewish Hospital and failure to show breach of a duty owed to him by Jewish Hospital. The trial court also granted summary judgment in favor of Colgate based on Brewster’s failure to show breach of any duty owed to him by Colgate, although the trial court rejected Colgate’s claim of statutory immunity from Brewster’s tort claim based upon the “up-the-ladder” defense.9
[146]*146The Court of Appeals affirmed the trial court on the ground that the property owners did not have a duty to warn of dangers of possible asbestos exposure or to take steps to protect Brewster from asbestos exposure because there was no evidence that either property owner had actual knowledge of a hidden danger of asbestos, citing both Farley and Clary. Although the Court of Appeals agreed with the trial court that the premises owners had no duty to warn, it rejected as inapplicable under Kentucky law the superior-knowledge standard cited by the trial court. The Court of Appeals also declined to extend to employees of independent contractors injured on the owner’s premises the burden-shifting approach used for business customers in slip-and-fall cases as in Lanier10 We now affirm the Court of Appeals.
III. ANALYSIS.
Before we address the question of the premises owner’s duty to warn, we note that other cases involving similar issues of potential premises-owner liability might be resolved without reaching the issue of duty if the trial court determines that the premises owner is entitled to up-the-ladder immunity. Jewish Hospital apparently never claimed this type of immunity. Colgate did claim it, but the trial court did not grant it summary judgment on this ground.
While we will express no opinion about whether Colgate could have been ultimately entitled to up-the-ladder immunity because we resolve this case on other grounds, we do not agree with Colgate that our recent ruling in Cain automatically establishes that Colgate is entitled to up-the-ladder immunity in this case. Since Brewster testified to pouring concrete at Colgate for a new addition, we think that the trial court properly found material issues of fact concerning the regular and recurrent characteristic of his work at Colgate, despite the fact that some tasks he performed — ripping out old materials in what may have been a routine maintenance project — closely resembled those held by this Court to be regular and recurrent in another case involving an independent contractor’s employee allegedly contracting an occupational disease at Colgate.11 We refer those seeking informa[147]*147tion on the up-the-ladder defense to our recent decision in Cain, which discusses in some detail the regular and recurrent aspect of the up-the-ladder defense.
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Opinion of the Court by
Chief Justice MINTON.
I. INTRODUCTION.
Decades after working on projects in various premises owners’ buddings, an independent contractor’s employee developed asbestosis, the cause of which the employee claimed arose from exposure to asbestos while working in the various buildings. Assuming that asbestos exposure occurred on the premises as the employee claimed, under what circumstances can the premises owners be held liable for the employee’s disease? Did the owners have a duty to warn of the presence and potential dangers of asbestos, which at one time was used extensively in building construction but later attracted notoriety as a potential health hazard?
Some argue that these questions are answered by longstanding Kentucky precedent establishing a duty to warn only where the building owner has actual knowledge of the danger and the independent contractor had neither actual nor constructive knowledge of the danger.1 Oth[144]*144ers argue that Kentucky should adopt an approach used by other state courts, which imposes a duty to warn only where the premises owner had superior knowledge of the danger at the time of exposure.2 Still others press for more liberalized recovery afforded by the burden-shifting approach used by Kentucky courts in business invitees’ slip-and-fall cases.3
We accepted discretionary review to provide guidance concerning when a premises owner’s duty to warn independent contractors4 arises in asbestos cases and in other hidden-danger cases.5 We now reaffirm the applicability of our longstanding precedent of Owens v. Clary, decline to adopt the similar-sounding but more dispute-producing superior knowledge approach and decline to expand the burden-shifting approach as used in customer slip-and-fall cases to the present context.
Charles E. Brewster filed the case before us after he was diagnosed -with asbestosis several years ago. Brewster alleges that he was exposed to asbestos-containing building materials while performing construction work for independent contractors at Colgate-Palmolive’s plant in Jefferson-ville, Indiana, in the 1960s and 1970s and at Jewish Hospital in Louisville in the 1970s. Brewster seeks to hold both premises owners liable for his asbestosis. Apparently, Brewster never sought workers’ compensation benefits for asbestosis from his independent-contractor employers because the statute of limitations had expired for such claims.6 The trial court granted summary judgment in favor of the premises owners. We agree with the Court of Appeals that summary judgment was proper based on the lack of evidence to establish a duty to warn under Kentucky law, and we decline to reach other issues raised by the parties as unnecessary for [145]*145resolution.7 We further decline to extend the burden-shifting approach employed in customer slip-and-fall cases.
II. FACTS.
Brewster worked as a laborer for several employers on numerous worksites between 1950 and 1979. Between 1966 and 1976, Brewster worked often for Dahlem Construction, a company based in Louisville, Kentucky. While employed by Dah-lem, he worked on projects at the Colgate-Palmolive plant in Jeffersonville, Indiana, for one or more brief periods.8 He recalled tearing out various materials at the plant. He also recalled pouring concrete for a new construction project.
Between employment stints at Dahlem, Brewster worked for Wilhelm Construction Company for a period beginning in 1970. He spent all of his time working for Wilhelm at Louisville’s Jewish Hospital. He recalled tearing out old materials, including insulation for ceilings, wiring, and tanks, while a new addition to the hospital was being built. He also recalled being present when new insulation was being installed.
A back injury disabled Brewster from work beginning in 1980. In 2001, he was diagnosed with asbestosis and brought suit against numerous parties. His suit alleged negligence claims against several property-owner defendants, including Jewish Hospital and Colgate, stating that they breached duties by failing to warn independent contractors working on their premises of the presence and dangers of asbestos. Eventually, the trial court granted summary judgment in favor of Jewish Hospital on the grounds of Brewster’s failure to produce evidence of exposure to asbestos at Jewish Hospital and failure to show breach of a duty owed to him by Jewish Hospital. The trial court also granted summary judgment in favor of Colgate based on Brewster’s failure to show breach of any duty owed to him by Colgate, although the trial court rejected Colgate’s claim of statutory immunity from Brewster’s tort claim based upon the “up-the-ladder” defense.9
[146]*146The Court of Appeals affirmed the trial court on the ground that the property owners did not have a duty to warn of dangers of possible asbestos exposure or to take steps to protect Brewster from asbestos exposure because there was no evidence that either property owner had actual knowledge of a hidden danger of asbestos, citing both Farley and Clary. Although the Court of Appeals agreed with the trial court that the premises owners had no duty to warn, it rejected as inapplicable under Kentucky law the superior-knowledge standard cited by the trial court. The Court of Appeals also declined to extend to employees of independent contractors injured on the owner’s premises the burden-shifting approach used for business customers in slip-and-fall cases as in Lanier10 We now affirm the Court of Appeals.
III. ANALYSIS.
Before we address the question of the premises owner’s duty to warn, we note that other cases involving similar issues of potential premises-owner liability might be resolved without reaching the issue of duty if the trial court determines that the premises owner is entitled to up-the-ladder immunity. Jewish Hospital apparently never claimed this type of immunity. Colgate did claim it, but the trial court did not grant it summary judgment on this ground.
While we will express no opinion about whether Colgate could have been ultimately entitled to up-the-ladder immunity because we resolve this case on other grounds, we do not agree with Colgate that our recent ruling in Cain automatically establishes that Colgate is entitled to up-the-ladder immunity in this case. Since Brewster testified to pouring concrete at Colgate for a new addition, we think that the trial court properly found material issues of fact concerning the regular and recurrent characteristic of his work at Colgate, despite the fact that some tasks he performed — ripping out old materials in what may have been a routine maintenance project — closely resembled those held by this Court to be regular and recurrent in another case involving an independent contractor’s employee allegedly contracting an occupational disease at Colgate.11 We refer those seeking informa[147]*147tion on the up-the-ladder defense to our recent decision in Cain, which discusses in some detail the regular and recurrent aspect of the up-the-ladder defense. Ultimately, however, we resolve Brewster’s case on the issue of duty, not on the issue of up-the-ladder immunity.
A. Both Premises Owners Were Entitled to Summary Judgment Based on Lack of Evidence to Support a Duty to Warn Independent Contractors of Hidden Danger of Asbestos.
Although Kentucky law prohibits granting summary judgment where there are “valid issues to try,”12 “a party opposing a properly supported summary judgment motion cannot defeat it without presenting at least some affirmative evidence showing that there is a genuine issue of material fact for trial.”13 Because Brewster failed to offer affirmative evidence establishing a genuine issue of material fact concerning the premises owners’ actual knowledge of the presence or danger of asbestos in response to the premises owners’ properly supported summary judgment motion,14 we conclude that the Court of Appeals properly affirmed the trial court’s summary judgments granted to Jewish Hospital and Colgate on the issue of duty.
We note that we review the propriety of the summary judgments granted here applying the traditional standard of premises-owner duty to independent contractors spelled out in the Clary case. And we do not believe that the advent of comparative negligence since Clary was decided demands a change in the law concerning premises-owner duty. Comparative negligence simply allows for proportional reduction in the award rather than barring recovery when both parties are at fault in some manner.15 But comparative negligence does not, by itself, change the law as to when one owes another a duty that could lead to liability for breaching that duty. Because Brewster presented no evidence establishing the premises owners’ actual knowledge of the presence and dangers of asbestos, we conclude that the premises owners were entitled to judgment in their favor as a matter of law.
Brewster points to evidence that Jewish Hospital conceded the presence of [148]*148asbestos in its buildings. Evidence of the presence of, or even exposure to, a potentially injurious substance or condition, however, is insufficient to overcome a properly supported summary judgment motion showing that no duty was established. Even if we assume solely for the purposes of argument that Brewster was exposed to asbestos while working at Jewish Hospital,16 his claim would still fail because he did not offer any evidence that Jewish Hospital knew of the presence or danger of asbestos at the time he worked there. Jewish Hospital has admitted to awareness of the presence of asbestos in some of its buildings in the 1980s when it undertook an asbestos abatement study. But this survey occurred long after Brewster worked for an independent contractor to build an addition to Jewish Hospital around 1970. We look at what the premises owner actually knew at the time the independent contractor worked on the premises in determining the duty owed at that time.
Similarly, Brewster offers no evidence that Jewish Hospital had actual knowledge of the dangers of asbestos exposure at the time he worked there. And while Brewster attempts to establish Jewish Hospital’s constructive knowledge at that time through various periodicals circulated during that time period, our precedent clearly establishes that actual — rather than constructive — knowledge of a hidden danger is required to establish a duty for a landowner to warn or take steps to protect an independent contractor and its employees.17 Given the lack of any evidence that Jewish Hospital had actual knowledge of the presence or dangers of asbestos exposure at the time Brewster worked there, we conclude that the trial court properly granted summary judgment on the issue of duty. Although it is not necessary to reach the issue of the contractor’s, Wilhelm’s, actual or constructive knowledge of the presence or dangers of asbestos, we also note that no proof regarding Wilhelm’s knowledge was offered by Brewster or Jewish Hospital.
We also conclude that the Court of Appeals properly affirmed the summary judgment granted in favor of Colgate. Unlike the proof regarding Jewish Hospital, Colgate had actually specified the use of asbestos-containing materials in its building expansions in the 1930s through the 1950s, which would seemingly establish at least an issue of fact regarding Colgate’s actual knowledge of the presence of asbestos in its buildings. But Brewster has failed to bring to our attention evidence showing that Colgate had actual knowledge of the danger of asbestos at the time he worked there. While we took note of deposition testimony showing that Colgate’s own employees used respirators when dealing with asbestos starting in the late 1970s or early 1980s, we found no proof in this record establishing that such protective measures were taken for Colgate’s employees during the same time Brewster worked on the plant, which ended in 1976.
[149]*149Brewster has failed to point to any specific evidence that Colgate was actually aware of the dangers of asbestos exposure at the time he worked there. And no evidence suggesting such awareness has come to our attention during our review of this case. Again, despite Brewster’s attempts to argue constructive knowledge through various periodicals in general circulation at the time he worked at Colgate, the premises owner must have actual — not just constructive — knowledge for a duty to warn to arise under Kentucky law. And a Colgate representative testified by deposition to Colgate’s relying on its contractors to have knowledge of the various materials present on the site and to take necessary precautions to protect their employees. Brewster offered no proof to show that his employer, Dahlem, did not have such knowledge. Given (1) the lack of evidence that Colgate had actual knowledge of the danger of asbestos exposure during the relevant time period and (2) the lack of evidence that Dahlem did not have actual or constructive knowledge of the danger of asbestos exposure during the relevant time period, we conclude that the trial court properly granted summary judgment on the issue of Colgate’s duty.
Because Brewster failed to offer evidence that either premises owner had actual knowledge of the dangers of asbestos at the time he worked on their premises, the Court of Appeals properly affirmed the summary judgments rendered in their favor on this ground.
B. Superior Knowledge Not Correct Test.
While other jurisdictions may use a test where the premises owner’s duty to warn depends on its having knowledge of a risk superior to that of its contractor, we believe this comparative approach would yield more confusion and factual disputes.18 We find our traditional approach, which demands that the premises owner have actual knowledge of the danger and the contractor have neither actual nor constructive knowledge of the danger for the premises owner’s duty to warn to arise, is still the most straightforward and fair approach. So we find no reason to abandon our traditional approach in favor of a superior knowledge approach.
C. We Decline to Extend Burdenr-Shifting Approach.
Brewster argues that he was a business invitee to Jewish Hospital’s and Colgate’s premises and, as such, the burden-shifting approach adopted in Lanier should apply to him. While we recognize that some confusion may have resulted when we began our discussion by generally referring to customers as “business invitees” 19 in Lanier; we note that our holding there concerned shifting the burden from a “customer” to a business owner since we chose to “impose a rebuttable presumption that shifts the burden of proving the absence of negligence, i.e., the exercise of reasonable care, to the party who invited [150]*150the injured customer to its business premises.”20
We find no reason to extend Lanier to the context of the case at hand; and, in fact, we explicitly limit Lanier to cases involving customers or clients or patrons suffering “slip and falls” or other injuries resulting from dangerous conditions on a business owner’s premises. And we note that other Kentucky reported cases following Lanier have also involved customers’ slip-and-fall cases,21 not injuries to other types of business invitees, such as independent contractors’ employees.
In cases like the case at hand, independent contractors’ employees (unlike retail customers) will generally have another available remedy through workers compensation; and someone other than the premises owner — their employer, the independent contractor — owes them a duty to look after their safety. So we see no reason to extend the burden-shifting approach established in Lanier for customers’ slip-and-fall claims to encompass the present context. Although, in some unfortunate situations, such as here, the worker might be unable to obtain workers’ compensation benefits because of the running of the statute of limitations, we think that this issue might better be addressed through appropriate legislative action on limitations than through our court’s extending a burden-shifting approach that might penalize premises owners who reasonably relied on their independent contractors’ knowledge and duty to provide a safe workplace for their own employees. So we decline to extend Lanier to the present context.
IV. CONCLUSION.
For the foregoing reasons, we affirm the opinion of the Court of Appeals.
MINTON, C.J.; CUNNINGHAM, NOBLE, SCHRODER, SCOTT, and VENTERS, JJ., sitting. CUNNINGHAM, NOBLE, and SCHRODER, JJ., concur. VENTERS, J., dissents by separate opinion in which SCOTT, J., joins. ABRAMSON, J., not sitting.