OPINION
KRUPANSKY, Circuit Judge.
The defendant-appellant Architectural Metal Works, Inc. (“Architectural”) has contested the district court’s summary judgment for the plaintiff-appellee Sheet Metal Workers, International Association, Local 24, Columbus Area (“the Union”) by which it enforced an award of the National Joint Adjustment Board for the Sheet Metal Industry (“NJAB”), a private alternative dispute resolution body composed of equal numbers of labor and management delegates. The NJAB had mandated that Architectural was bound by the terms of a 1997-2000 collective bargaining agreement entered into between the Union and the Sheet Metal Contractors Association of Central Ohio (“the Association”), a multi-employer trade association which represents the interests of member sheet metal enterprises in central Ohio, because Architectural had voluntarily assented to the terms of the predecessor 1994-97 collective bargaining agreement between the Union and the Association. This agreement included an alleged pledge to either accept the terms of a successor renewal contract between the Union and the Association, bargain independently in good faith with the Union for separate terms for the consecutive contract period, or submit the matter to binding arbitration before the NJAB if the Union and Architectural should fail to agree upon contract renewal terms.
At all times relevant to this litigation, Architectural, a small local construction contractor based in Galena, Ohio, engaged in the fabrication of sheet metal roofing seam components and the installation of those materials on commercial and industrial structures. It bid competitively for its roofing contracts. Historically, Architectural has employed between one and five laborers on a “per-job” basis. The Union exclusively represented the organized sheet metal workers within its tezri-torial jurisdiction in negotiations with area employers regarding wages, hours, and terms and conditions of employment. Since at least June 1, 1991, the Union has sequentially negotiated “pre-hire” collec[421]*421tive bargaining agreements1 of three years’ duration with the Association. Architectural had never formally joined the Association’s membership. Nonetheless, on February 22, 1993, an authorized officer of the defendant company executed a separate one-page “Letter of Assent,” which stated, in material part:
This is to certify that the undersigned firm [Architectural] has examined and does agree to comply with the terms and conditions of employment contained in the collective bargaining agreement by and between Sheet Metal Workers’ Local Union # 24 and the Sheet Metal Contractors of Central Ohio, effective June 1, 1991 through May 31,1994.
It is further agreed that the signing of this letter of assent shall be as binding on the undersigned firm as though it had signed the above referred agreement and any amendments thereto.
Prior to the May 31, 1994 expiration of the three-year “pre-hire” labor contract, the Union and the Association negotiated a successor collective bargaining agreement, to be effective between June 1, 1994 and May 31, 1997. On November 3, 1994, Architectural voluntarily executed a second Letter of Assent; its pertinent verbiage was identical to the initial February 22, 1993 Letter of Assent, quoted above, excepting only that the second letter identified the “pre-hire” contract “effective June 1,1994 through May 31, 1997.”
The master 1994-97 “pre-hire” collective bargaining agreement, in Article XII, Section 1, stipulated that its terms would remain in effect until May 31, 1997, unless certain specified conditions were to prevail:
This Agreement and Addendums attached hereto shall become effective on the First day of June, 1994, and remain in its full force and effect until the 31st day of May, 1997, and shall continue in force from year to year thereafter unless written notice of reopening is given not less than Ninety (90) days prior to the expiration date. In the event such no[422]*422tice of reopening is sewed, this Agreement shall continue in its force and effect until conferences relating thereto have been terminated by either party by written notice, provided, however, that if this Agreement contains Ariicle X, Section 8 [quoted below], it shall continue in full force and effect until modified by order of the National Joint Adjustment Board or until the procedures under Article X Section 8 have been otherwise completed.
(Emphases added). (Article XII, § 1 is sometimes referred to herein as the “extension clause”).
Article X of the 1994-97 “pre-hire” labor contract between the Union and the Association contained the above-referenced optional Section 8. Article X recited, in pertinent segment:
The Union and the Employer, whether party to this Agreement independently or as a member of a multi-employer bargaining unit, agree to utilize and be bound by this Article.
SECTION 8.- — In addition to the settlement of grievances arising out of interpretation or enforcement of this Agreement as set forth in the preceding sections of this Article, any controversy or dispute arising out of the failure of the parties to negotiate a renewal of this Agreement shall be settled as hereinafter provided:
a) Should the negotiations for renewal of this Agreement become deadlocked in the opinion of the Local Union or of the Local Contractor’s Association, or both, notice to that effect shall be given to the National Joint Adjustment Board.
(Emphases added). (Article X, § 8 is sometimes referred to herein as the “interest arbitration clause.”). Subsection 8A of that proviso posited, among other things, that a subsequent decision by the NJAB, or a duly designated subcommittee of its members, which resolves a negotiation stalemate, “shall be final and binding upon the parties.”
On or about February 14, 1997, the Union timely posted a certified notice addressed to Architectural which announced that, in accordance with Article XII of the “pre-hire” agreement, the Union elected to reopen the collective bargaining relationship for negotiation of a new labor contract. Herman (“Butch”) Immel (“Im-mel”), Architectural’s Secretary and Field Superintendent, testified that, during the spring of 1997, he informed Donald Stilt-ner and Doug Biggs, the Union’s Business Representatives, and Charles Frazier, the Union’s Business Manager and Financial Secretary, that Architectural was terminating its voluntary collective bargaining relationship with the Union.2 Immel explained that competitor local sheet metal construction contractors which employed non-organized craftsmen had underbid Architectural for numerous seam metal roofing contracts because of prevailing lower free-market wage rates. Effective June 1, 1997, Architectural ceased contributing to the Union’s fringe benefit funds.
[423]*423On December 9, 1997, the Union initiated, before the National Labor Relations Board (“NLRB” or “the Board”), an unfair labor practice charge against Architectural by which it alleged, inter alia, that Article X, § 8 and Article XII, § 1 of the 1994-97 collective bargaining agreement compelled Architectural to bargain with the Union concerning the terms and conditions of a successor three-year “pre-hire” agreement, but Architectural had failed to do so.
On January 14, 1998, a staff attorney employed by the NLRB’s Regional Office in Cincinnati, Ohio (“Region 9”), pronounced, in an opinion letter delivered to the Union’s lawyer, that neither the 1994— 97 master contract’s “extension,” nor its “interest arbitration,” clauses were implicated in the subject circumstances, because no ongoing negotiations between the Union and Architectural had “deadlocked.” Rather, Architectural had instead elected not to negotiate, because it had resolved not to renew its voluntary relationship with the Union following the purported May 31, 1997 expiration of the existing collective bargaining agreement rather than undertake the negotiations assertedly impelled by the Union’s timely “letter of reopening.” The NLRB counselor explained:
I am sorry to inform you that the Regional Office has determined to dismiss the above-referenced charge, absent withdrawal. The Region carefully considered your argument that Article X Section 8 [the “interest arbitration clause”] coupled with Article XII Section 1 [the “extension clause”] of the applicable contract binds the Employer to one more contract under the facts of this case.
The Region concluded that the year to year renewal provision of Article XII Section 1 of the contract was effectively forestalled by the Union’s letter of reo-pener [sic] sent to.the Employer on or about February 14, 1998 [sic — 1997], The Region also considered the caveat to Section 1 that the “Agreement shall continue in full force and effect ... until modified by the National Adjustment Board or until the procedures under Article X, Section 8 have been otherwise completed.” It appears to the Region, however, that Article X, Section 8 is clearly directed at parties in ongoing negotiations who have deadlocked-far from the situation in the instant case. Therefore it was viewed as inoperative. Moreover, while the National Adjustment Board may apparently fashion a remedy binding an employer to one more contract, there appears to be nothing in Article X, Section 8 indicating that this is a remedy under the contract.
In summation, as the contract has not renewed from year to year, and as the caveat to the automatic renewal clause is inapplicable to the instant situation, the Employer is free to repudiate its relationship with the Union. To determine otherwise could result in the situation where an employer, having once signed a letter of assent, could be bound in perpetuity to the [29 U.S.C. § 158(f); National Labor Relations Act (“NLRA”) §] 8(f) contract at the discretion of the National Joint Adjustment Board.
(Ellipsis in original).
Subsequently, the Union objected to that opinion, which prompted Region 9 to refer the controversy to the Board’s headquarters in Washington, D.C. for additional guidance.
In the meantime, the Union, on February 8, 1998, instituted a parallel complaint against Architectural before the NJAB, presented on a standardized NJAB form entitled “Collective Bargaining Reporting Form, Notice of Unresolved Dispute, Article X Section 8.” The Union alleged there[424]*424on that Architectural had violated the 1994-97 collective bargaining agreement by refusing to negotiate contract renewal terms following the Union’s proper “notice of reopening,” which averredly constituted a “deadlock” of mandatory negotiations, which in turn activated the NJAB’s contractually-bestowed jurisdiction to resolve the alleged bargaining impasse.
On February 18, 1998, an Assistant General Counsel for the NLRB in Washington, D.C. opined that Region 9 had correctly rejected the Union’s unfair labor practice charge against Architectural.3 In accordance therewith, on February 26, 1998, Region 9 alerted the Union’s counsel that Architectural was not compelled to abide by the new collective bargaining agreement entered into between the Union and the Association for the period June 1, 1997 — May 31, 2000. Consequently, on March 12, 1998, the Union voluntarily withdrew its unfair labor practice charge against Architectural.
Nonetheless, the Union’s related complaint against Architectural before the NJAB remained pending. On May 28, 1998, following written notice to both parties, a two-person “subcommittee” of the NJAB convened to hear the Union’s charge that Architectural had violated the 1994-97 “pre-hire” collective bargaining agreement by refusing to negotiate contract renewal terms for the period 1997-2000. Architectural declined to appear at that proceeding or to submit any evidence in its defense, averredly relying upon the NLRB’s previous directives that the 1994-97 contract had not committed Architectural to negotiate post-May 31, 1997 renewal terms with the Union.
On June 15, 1998, the NJAB panel issued a unanimous two-paragraph resolution of the Union’s claim, which propounded:
After review of all information provided, the Subcommittee determined that Architectural Metal had refused to negotiate.
It is the unanimous decision of the Subcommittee that Architectural Metal and SMWIA Local 24 [the Union] enter into an agreement effective June 1, 1997-May 31, 2000 that incorporates the same terms and conditions as the current building trades agreement between Sheet Metal Contractors of Central Ohio [the Association] and SMWIA Local 24.
Thereafter, Architectural refused to comply with the Union’s repeated demands that it execute a Letter of Assent to the 1997-2000 “pre-hire” agreement,4 or to otherwise abide by the NJAB’s award.
[425]*425On December 2, 1998, the Union launched a two-count complaint against Architectural in federal district court, by which it sought judicial enforcement of the NJAB’s edict as constituting a valid exercise of its contractually-bestowed arbitral authority under the 1994-97 “pre-hire” agreement as between the Union and Architectural. See 29 U.S.C. § 185(a). Count One alleged that the “extension” and “interest arbitration” clauses of the 1994-97 labor agreement, taken together, mandated that Architectural must negotiate with the Union for contract extension terms following proper “notice of reopening” given by the Union, and its failure to do so comprised a negotiation “deadlock” which empowered the NJAB, upon application by the Union, to impose substantive contract terms upon Architectural for the renewal interval. Count Two incorporated Count One’s allegations by reference, but additionally asserted that Architectural’s refusal to honor the NJAB’s binding award has caused as-yet-undetermined financial damages to the Union and its members. The Union’s judicial complaint requested enforcement of the NJAB’s decree; an injunction directing Architectural to execute the 1997-2000 “pre-hire” collective bargaining agreement and to specifically perform in accordance with its provisions; monetary damages; and costs including attorney fees.
In August 1999, the litigants lodged cross-petitions for summary judgment in the district court. On February 3, 2000, the district court denied Architectural’s motion but granted the Union’s motion, holding that the 1994-97 collective bargaining agreement, coupled with Architectural’s Letter of Assent thereto, had required Architectural, under the circumstances, either to voluntarily conjoin the successor “pre-hire” agreement executed by the Association and the Union, to separately negotiate contract renewal terms with the Union, or to arbitrate before the NJAB any failure(s) to agree upon renewal covenants. On February 28, 2000, Architectural timely appealed the lower court’s summary judgment for the Union. 28 U.S.C. § 1291.
The keystone issues framed by Architectural primarily concern the construction and application of the 1994-97 collective bargaining agreement’s Article X, § 8 (the “interest arbitration clause”) coupled with Article XII, § 1 (the “extension clause”). The lynchpin question posed is whether the NJAB had disposed of a controversy between Architectural and the Union which was subsumed within the NJAB’s contractually-created arbitral jurisdiction. See AT & T Technologies, Inc. v. Communications Workers, 475 U.S. 643, 648, 106 S.Ct. 1415, 89 L.Ed.2d 648 (1986) (“arbitration is a matter of contract and a party cannot be required to submit to arbitration any dispute which he has not agreed so to submit.”) (citations omitted). If the NJAB possessed jurisdiction over the subject dis[426]*426agreement, the ultimate inquiry then becomes whether its resolution of that conflict was legally proper and enforceable.
Assessment of the enforceability, scope, and meaning of a contractual arbitration clause in a labor agreement typically poses a question of law for judicial resolution. Id. at 649, 106 S.Ct. 1415 (“Unless the parties clearly and unmistakably provide otherwise, the question of whether the parties agreed to arbitrate is to be decided by the court, not the arbitrator.”) (citations omitted); see also Beach Air Conditioning and Heating, Inc. v. Sheet Metal Workers, 55 F.3d 474, 476 (9th Cir.1995) (“Whether a dispute is subject to arbitration is an issue for the courts rather than the arbitrator to decide.”) (citation omitted).5 Moreover, because the construction of pertinent provisions of the 1994-97 labor agreement, and Architectural’s affiliated Letter of Assent thereto, constitute issues of law,6 they may be resolved by a court via summary adjudication under Féd.R.Civ.P. 56.7
By executing its 1994 Letter of Assent, Architectural bound itself to honor all covenants of the 1994-97 collective bar[427]*427gaining agreement, including Articles X and XII. See Carpenters Local Union No. 845 Health and Welfare Fund v. W.D. George Construction Co., 792 F.2d 64, 65-66 (6th Cir.1986) (explaining that a “compliance agreement” similar to Architectural’s “Letter of Assent” was a short-form agreement whereby a non-union employer had pledged to abide by the terms of a labor contract previously negotiated between a local union and an industry employers’ representative). Article X of the 1994-97 master “pre-hire” labor agreement posited that an employer, “whether party to this Agreement independently or as a member of a multi-employer bargaining unit,8 agree[s] to utilize and be bound by this Article.” (Emphases added).
However, although Article X facially stipulated that each of its subparts applied to each employer governed by the master contract, the defendant has nonetheless contended that, irrespective of whether an independent employer such as Architectural had elected to participate in the “pre-hire” agreement by signing that document or by executing a Letter of Assent, Section 8 of Article X did not apply to any employer which was not a member of the Association. Architectural has emphasized the portion of Article X, § 8, subpt. (a), which stated that “Should the negotiations for renewal of this Agreement become deadlocked in the opinion of the Local Union or of the Local Contractor’s Association, or both, notice to that effect shall be given to the National Joint Adjustment Board.” (Boldface added). The defendant has claimed that the preceding clause could not apply to it, because it is not a member of the Association, and therefore it would have no reciprocal right to take a “deadlocked” negotiation to the NJAB.
However, Architectural’s foundational premise that the Association did not represent it during the term of the 1994-97 “pre-hire” arrangement was misconceived. Article XII, § 4 of the master collective bargaining contract propounded, in part, that “[b]y execution of this Agreement the Employer authorizes Sheet Metal Contractors of Central Ohio to act as its collective bargaining representative for all matters relating to this Agreement.”9 Consequent[428]*428ly, in the typical negotiating scenario, the Association, when bargaining with the Union, would act as the representative of all employer parties to the contract, whether or not they were members of the Association.
Therefore, the contracting parties’ use of the characterizations “Local Union” and “Local Contractor’s Association” did not limit, the scope of Article X, Section 8, subpt. (a), to exclude “deadlocked” direct negotiations regarding the provisions of a successor contract between the Union and an individual employer such as Architectural, given the overall language and purpose of the subject sheet metal industry labor agreement. When Architectural repudiated its voluntary adherence to the collective bargain struck between the Union and the Association effective with the May 31, 1997 expiration of the 1994-97 contract, it stepped into the shoes of the Association, its erstwhile collective bargaining agent, for purposes of the “extension clause” and the “interest arbitration clause.” See Sheet Metal Workers Int’l Assoc. Local 110 Pension Trust Fund v. Dane Sheet Metal, Inc., 932 F.2d 578 (6th Cir.1991) (construing a sheet metal industry “pre-hire” agreement containing a proviso denominated Article X, § 8 which was substantially similar to the “interest arbitration clause” implicated in the case in controversy to impose a duty upon an individual employer, which had disassociated itself from the industry’s employer representative, to directly negotiate renewal covenants and conditions with the Union for an additional contract period).
Because the Union had timely notified Architectural of its desire to negotiate the terms of a new “pre-hire” collective bargaining agreement for the approaching three-year contract duration, a contractual duty bound Architectural, by operation of the “interest arbitration clause,” to negotiate renewal terms in good faith.10 See id. [429]*429at 579-82 & n. 1. Architectural’s refusal to bargain interposed a negotiation logjam which, by authority of the “interest arbitration” clause, the Union properly submitted to the NJAB for resolution; consequently, Architectural was contractually bound to accept the solution formulated by the NJAB to the parties’ bargaining stalemate.11 Id. at 581-82. Accordingly, the NJAB possessed proper contractually-created “interest arbitration” jurisdiction to resolve the Union’s and Architectural’s negotiation standstill.
Once an arbitrator’s contractual jurisdiction to resolve a labor dispute is established, judicial review of the arbitrator’s substantive decision is strictly limited, irrespective of whether the subject award had resolved a “grievance” or an “interest” conflict. See Local 58, Int’l Bhd. of Elec. Workers v. Southeastern Mich. Chap., Nat’l Elec. Contractors Assoc., Inc., 43 F.3d 1026, 1030 (6th Cir1995). An arbitrator’s “grievance arbitration” award, which entails the interpretation and application of provisions of an existing collective bargaining agreement, should be sustained if it “draws its essence from the agreement.” Id. “[A]s long as the arbitrator is even arguably construing or applying the contract and acting within the scope of his authority, [the award should be sustained;] that a court is convinced he committed serious error does not suffice to overturn his decision.”12 Id. (quoting Federated Dep’t Stores, Inc. v. J.V.B. Indus., Inc., 894 F.2d 862, 866 (6th Cir.1990)).
Moreover, an arbitrator’s resolution of an “interest arbitration” controversy, which necessitates dictation of the substantive contractual terms which will prevail in a new collective bargaining relationship of finite duration to follow the expiration of an existing labor agreement, is entitled to comparatively even greater judicial respect than the already elevated degree of court deference accorded to “grievance arbitration” decisions:
We find that this framework of analysis, formulated in the context of grievance arbitration, is applicable to interest arbitration with slight modification. Interest arbitration, unlike grievance arbitration, focuses on what the terms of a new agreement should be, rather than the meaning of the terms of the old agreement. Thus, the arbitrator is not acting as a judicial officer, construing the terms of an existing agreement and applying them to a particular set of facts. Rather, he is acting as a legislator, fashioning new contractual obligations. Consequently, we recognize that even greater deference must be paid to the arbitrator’s decision, once it [430]*430is established that he had the authority to resolve the issue.
Id. (Italics and boldface added; citations omitted).
Therefore, the NJAB’s edict that Architectural must accede to a collective bargaining agreement with the Union “effective June 1, 1997 — May 31, 2000 that incorporates the same terms and conditions as the current building trades agreement between” the Union and the Association was not subject to judicial reassessment, at least regarding the NJAB’s importation of the substantive covenants and conditions governing the labor-management relationship contained within the June 1, 1997 to May 31, 2000 master “pre-hire” collective bargaining agreement consummated between the Union and the Association. See id. at 1030-33; see also Dane Sheet Metal, 932 F.2d at 581-82.
However, the NJAB did not have the power to add any “interest arbitration clause,” or “extension clause,” to the new June 1, 1997 — May 31, 2000 labor agreement which it had created for the Union and Architectural, irrespective of the incorporation of such clauses into the master 1997-2000 collective bargaining agreement approved by the Union and the Association, because the predecessor 1994^97 agreement had contractually bound Architectural only to negotiate a successor three-year labor contract which addresses the subjects of collective bargaining which would be mandatory under the NLRA if the Union had been the duly certified labor representative of Architectural’s workers. See Local 58, Int’l Bhd. Elec. Workers, 43 F.3d at 1032. “In NLRB v. Wooster Div. of Borg-Warner Corp., 356 U.S. 342, 349, 78 S.Ct. 718, 2 L.Ed.2d 823 (1958), the Supreme Court held that the duty to bargain in good faith is limited to the subject of wages, hours, [and] terms and conditions of employment. Neither party is required to bargain on other matters.” Id. (citing, inter alia, 29 U.S.C. § 158(d)).
The law of the Sixth Circuit forbids including, in any arbitrator-fashioned labor contract legitimated by a contractual “interest arbitration” clause, any contractual term which does not address a legally mandatory subject of collective bargaining, in the absence of the agreement of all parties:
Although interest arbitration of mandatory subjects is permissible, interest arbitration is not itself a mandatory subject of bargaining. Moreover, interest arbitration as to non-mandatory subjects is “void as contrary to public policy.” Consequently, the law is clear that an arbitrator may not use an interest arbitration clause as a means of self-perpetuation, and that this type of “second generation” interest arbitration clause cannot be included over another party’s objection,13
[431]*431Id. at 1032 (emphasis added; citations omitted). Hence, if the 1997-2000 master “pre-hire” labor agreement between the Union and the Association included any “interest arbitration” and/or “extension” clause(s), and/or any other covenant or condition which did not directly implicate a mandatory subject of collective bargaining, such term(s) shall be deemed null, void, and unenforceable against Architectural.
Consequently, the NJAB validly imposed against Architectural the identical covenants and conditions governing wages, hours, and other terms and conditions of employment, which had been memorialized in the collective bargaining agreement adopted by the Union and the Association, for the duration June 1, 1997 through May 31, 2000. However, on May 31, 2000, that NJAB-created agreement finally lapsed. No consecutive labor agreement can be imposed against Architectural in the absence of its voluntary assent.
Accordingly, after carefully considering each argument mounted by the defendant Architectural, and construing all record evidence in the light most favorable to it, the district court’s summary judgment for the plaintiff Union, which had sustained the NJAB’s award against Architectural, is AFFIRMED, to the extent that it ratified the NJAB’s incorporation of covenants and conditions which concerned mandatory subjects of collective bargaining, namely wages, hours, and other terms and conditions of employment, into an arbitrator-fabricated “pre-hire” labor contract between the Union and Architectural spanning June 1, 1997 to May 31, 2000. However, this cause is REMANDED to the district court for such necessary further proceedings as are consistent with this opinion, including, but not necessarily limited to, the exclusion from the NLRB-fashioned “pre-hire” contract, of any “interest arbitration clause,” “extension [432]*432clause,” and/or other provision(s) which did not directly address a mandatory subject of collective bargaining. See Int'l Bhd. Elec. Workers, 43 F.3d at 1033.
AFFIRMED AND REMANDED WITH INSTRUCTIONS.