OPINION
MAYER, Judge.
Plaintiff Salem Engineering and Construction Corporation (Salem) brought this suit under the Contract Disputes Act of 1978, 41 U.S.C. § 609(a)(1) (Supp. IV 1980), for an equitable adjustment of a construction contract price for work performed on instructions of defendant allegedly exceeding the requirements of the contract. The government defended on the basis that Salem’s interpretation of the contract is unreasonable and it had a duty to request clarification if the contract specifications and drawings were unclear or ambiguous. Trial was held in Boston, Massachusetts.
FACTS AND CONTENTIONS
Salem was awarded a contract for the extension and remodeling of the Social Security Administration District Office Building in Haverhill, Massachusetts. In the course of performance, a dispute arose over the scope of roofing work required. When Salem was asked by defendant’s Clerk of the Works how it intended to protect the existing occupied building from damage during reroofing, Salem responded that the contract required it to remove and install only so much of the existing roof as was necessary to join it to the roof installed on the new addition. The Clerk replied that under the contract Salem was required to also remove and replace the roof on the existing building. At Salem’s request, a written directive to that effect was issued by the General Services Administration (GSA) and, under protest, Salem performed the reroofing work.
After completion of the project, Salem submitted a written claim to GSA on March 5, 1979, with a breakdown of costs for removing and replacing the existing roof and met with GSA representatives to discuss the matter. Three months later, by letter of June 14, 1979, Salem requested a final decision from the contracting officer pursuant to the disputes clause of the contract. Salem’s claim for an adjustment was denied and this suit followed.
[805] The disagreement centers around the interpretation of paragraph 2.2 of contract section 0211 on demolition, and general note No. 4 of drawing 27-A-301. Paragraph 2.2 provides:
Remove existing east wall shown to top of foundation walls. Remove all interior partitions as indicated on drawings. Remove exterior grade mounted lighting fixtures. Remove all existing carpet. Remove existing drinking fountain and wheelchair toilet stalls and wall rails. Remove existing B.U. [built up] Roof, Roof insulation and gravel stop. (Emphasis added.)
Note No. 4 on the drawing states:
Remove existing B.U. [built up] roof, insulation and gravel stop. Install new tapered urethane insulation, B.U. roof and gravel stop. Add additional blocking and base flashing as required.
Defendant argues that these provisions clearly require Salem to remove and replace the entire existing roof.
Salem, on the other hand, says that when these provisions are read together with the contract drawings and other specifications, and in light of the primary purpose of the contract, construction of an addition to the office building, it is reasonable to interpret them as requiring removal and replacement of the existing roof only to the extent necessary to join it to the roof on the new addition.
As support for this interpretation, Salem points to the following three paragraphs of contract section 01000 on special conditions:
2.1 Existing structures shown shall remain in place except as otherwise noted on drawings and specified under Section [0211], Demolition.
22.1 Unless otherwise noted on drawings or specified, new work in extension of existing conditions shall correspond in all respects with that to which it connects, or to similar existing conditions, in materials, workmanship and finish.
23.1 Existing work shall be cut, drilled[,] altered, removed, or temporarily removed and replaced as necessary for performance of work under the contract. Work that is replaced shall match similar existing work. Structural members shall not be cut or altered, except where noted on drawings, without authorization of the Contracting Officer. Work remaining in place which is damaged or defaced during this contract shall be restored to the condition existing at time of award of contract.
In addition, it cites drawings 27-A-301 and 27-A-303. The principal diagram on drawing 27-A-301 represents an aerial view of the building as it would appear after completion of the addition and contains arrows delineating the existing roof in contrast to the roof on the new structure. It shows the location for a “new” roof scuttle on the “existing” roof, “new” roof drains on the addition, and “new” blacktop and curbing along the side of the building. The north, south, east, and west elevation diagrams on the drawing are shaded to represent the new addition, but not the roof on the existing building. The detail schematic of the gravel stop in the north elevation is shown in the new addition and shows only one layer of insulation as required by the contract for the new roof. In drawing 27-A-303, however, the detail at the air conditioning unit on the existing roof is shown with two layers of insulation, which was the construction of that roof. Salem argues that if it was required to remove and replace the entire existing roof the air conditioning unit detail should show only one layer of insulation as required for the new roof under the contract, just as the one for the gravel stop did.
Defendant counters that paragraph 2 of the general provisions section says that “[i]n case of difference between drawings and specifications, the specifications shall govern,” and “[i]n case of discrepancy either in the figures, in the drawings, or in the specifications, the matter shall be promptly submitted to the Contracting Officer, who shall promptly make a determination in writing.” Defendant further contends that Salem’s reliance on the absence of shading on the existing roof in the elevation details of drawing 27-A-301 is mis[806] placed because the diagrams do not indicate the scope of the work to be performed. No significance should be attached to the fact that the detail at the gravel stop is shown on the new addition because it is merely an example which could have been shown anywhere on the roof, new or existing, and defendant notes that the steel deck in that detail is labeled “new and existing.”
Defendant also points out that the typical duct opening diagram on drawing 27-A-303 contains the phrase, “existing roof deck and structure to remain,” along with “(new) 4-ply built-up roofing.” These phrases indicate that a new roof was to be placed on the existing structure. Finally, defendant asserts that Salem’s interpretation of the contract must be rejected because it gives no meaning to the directive in the specification and drawing note to “[rjemove existing B.U. Roof, insulation and gravel stop.”
CONTRACT INTERPRETATION
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OPINION
MAYER, Judge.
Plaintiff Salem Engineering and Construction Corporation (Salem) brought this suit under the Contract Disputes Act of 1978, 41 U.S.C. § 609(a)(1) (Supp. IV 1980), for an equitable adjustment of a construction contract price for work performed on instructions of defendant allegedly exceeding the requirements of the contract. The government defended on the basis that Salem’s interpretation of the contract is unreasonable and it had a duty to request clarification if the contract specifications and drawings were unclear or ambiguous. Trial was held in Boston, Massachusetts.
FACTS AND CONTENTIONS
Salem was awarded a contract for the extension and remodeling of the Social Security Administration District Office Building in Haverhill, Massachusetts. In the course of performance, a dispute arose over the scope of roofing work required. When Salem was asked by defendant’s Clerk of the Works how it intended to protect the existing occupied building from damage during reroofing, Salem responded that the contract required it to remove and install only so much of the existing roof as was necessary to join it to the roof installed on the new addition. The Clerk replied that under the contract Salem was required to also remove and replace the roof on the existing building. At Salem’s request, a written directive to that effect was issued by the General Services Administration (GSA) and, under protest, Salem performed the reroofing work.
After completion of the project, Salem submitted a written claim to GSA on March 5, 1979, with a breakdown of costs for removing and replacing the existing roof and met with GSA representatives to discuss the matter. Three months later, by letter of June 14, 1979, Salem requested a final decision from the contracting officer pursuant to the disputes clause of the contract. Salem’s claim for an adjustment was denied and this suit followed.
[805] The disagreement centers around the interpretation of paragraph 2.2 of contract section 0211 on demolition, and general note No. 4 of drawing 27-A-301. Paragraph 2.2 provides:
Remove existing east wall shown to top of foundation walls. Remove all interior partitions as indicated on drawings. Remove exterior grade mounted lighting fixtures. Remove all existing carpet. Remove existing drinking fountain and wheelchair toilet stalls and wall rails. Remove existing B.U. [built up] Roof, Roof insulation and gravel stop. (Emphasis added.)
Note No. 4 on the drawing states:
Remove existing B.U. [built up] roof, insulation and gravel stop. Install new tapered urethane insulation, B.U. roof and gravel stop. Add additional blocking and base flashing as required.
Defendant argues that these provisions clearly require Salem to remove and replace the entire existing roof.
Salem, on the other hand, says that when these provisions are read together with the contract drawings and other specifications, and in light of the primary purpose of the contract, construction of an addition to the office building, it is reasonable to interpret them as requiring removal and replacement of the existing roof only to the extent necessary to join it to the roof on the new addition.
As support for this interpretation, Salem points to the following three paragraphs of contract section 01000 on special conditions:
2.1 Existing structures shown shall remain in place except as otherwise noted on drawings and specified under Section [0211], Demolition.
22.1 Unless otherwise noted on drawings or specified, new work in extension of existing conditions shall correspond in all respects with that to which it connects, or to similar existing conditions, in materials, workmanship and finish.
23.1 Existing work shall be cut, drilled[,] altered, removed, or temporarily removed and replaced as necessary for performance of work under the contract. Work that is replaced shall match similar existing work. Structural members shall not be cut or altered, except where noted on drawings, without authorization of the Contracting Officer. Work remaining in place which is damaged or defaced during this contract shall be restored to the condition existing at time of award of contract.
In addition, it cites drawings 27-A-301 and 27-A-303. The principal diagram on drawing 27-A-301 represents an aerial view of the building as it would appear after completion of the addition and contains arrows delineating the existing roof in contrast to the roof on the new structure. It shows the location for a “new” roof scuttle on the “existing” roof, “new” roof drains on the addition, and “new” blacktop and curbing along the side of the building. The north, south, east, and west elevation diagrams on the drawing are shaded to represent the new addition, but not the roof on the existing building. The detail schematic of the gravel stop in the north elevation is shown in the new addition and shows only one layer of insulation as required by the contract for the new roof. In drawing 27-A-303, however, the detail at the air conditioning unit on the existing roof is shown with two layers of insulation, which was the construction of that roof. Salem argues that if it was required to remove and replace the entire existing roof the air conditioning unit detail should show only one layer of insulation as required for the new roof under the contract, just as the one for the gravel stop did.
Defendant counters that paragraph 2 of the general provisions section says that “[i]n case of difference between drawings and specifications, the specifications shall govern,” and “[i]n case of discrepancy either in the figures, in the drawings, or in the specifications, the matter shall be promptly submitted to the Contracting Officer, who shall promptly make a determination in writing.” Defendant further contends that Salem’s reliance on the absence of shading on the existing roof in the elevation details of drawing 27-A-301 is mis[806] placed because the diagrams do not indicate the scope of the work to be performed. No significance should be attached to the fact that the detail at the gravel stop is shown on the new addition because it is merely an example which could have been shown anywhere on the roof, new or existing, and defendant notes that the steel deck in that detail is labeled “new and existing.”
Defendant also points out that the typical duct opening diagram on drawing 27-A-303 contains the phrase, “existing roof deck and structure to remain,” along with “(new) 4-ply built-up roofing.” These phrases indicate that a new roof was to be placed on the existing structure. Finally, defendant asserts that Salem’s interpretation of the contract must be rejected because it gives no meaning to the directive in the specification and drawing note to “[rjemove existing B.U. Roof, insulation and gravel stop.”
CONTRACT INTERPRETATION
The initial inquiry is whether the contract specifications and drawings with respect to removal and replacement of the existing roof are ambiguous. The contract is ambiguous if it sustains the interpretations advanced by both parties, Max Drill, Inc. v. United States, 192 Ct.Cl. 608, 627, 427 F.2d 1233, 1245 (1970), and in construing it, the court must place itself in the shoes of a reasonable and prudent construction contractor. Norcoast Constructors, Inc. v. United States, 196 Ct.Cl. 1, 9, 448 F.2d 1400, 1404 (1971); Firestone Tire & Rubber Co. v. United States, 195 Ct.Cl. 21, 30, 444 F.2d 547, 551 (1971). The language of the contract must be given that meaning which a reasonably intelligent contractor acquainted with the circumstances surrounding the contract would derive. Id.; Hol-gar Manufacturing Corp. v. United States, 169 Ct.Cl. 384, 388, 351 F.2d 972, 975 (1965). Therefore, the court must consider the purpose of the contract along with its language.
After examining these specifications and drawings in light of the testimony at trial, the court concludes that the contract can be read to support both parties’ interpretations and is, therefore, ambiguous. The court disagrees with defendant’s assertion that to find the roofing provisions ambiguous one would have to ignore or give no meaning to the specification and drawing note to “remove existing B.U. Roof, insulation and gravel stop.” It is correct that the court should accept an interpretation which gives a reasonable meaning to all parts of a contract, rather than one which renders a provision of the instrument meaningless or useless. Hol-gar Manufacturing, 169 Ct.Cl. at 395, 351 F.2d at 979. But Salem’s interpretation does not disregard the directives in question; it varies from that of defendant only on the scope of removal required.
The contract does not specifically state that the contractor must remove and replace the “entire roof” on the existing building. Unlike other provisions in the contract, the section on roofing does not contain a description of the scope of work to be performed. Compare sections 0952 on acoustical wall panels; 1516 on thermal insulation; and 0990 on painting and finishing, with section 0750 on built-up bituminous roofing system. Nevertheless, defendant contends that the work was clearly and unambiguously prescribed by the contract and if it merely had wanted the new roof connected to the existing one, it would have specifically said how to do it. This may have been clear in the minds of the drafters of the contract or defendant’s architect, but their subjective intent does not control. The representations of the specifications and drawings govern the interpretation of the contract. Max Drill, 192 Ct.Cl. at 628, 427 F.2d at 1245; L. Rosenman Corp. v. United States, 182 Ct.Cl. 586, 590, 390 F.2d 711, 714 (1968).
The section on demolition refers to removal of existing roof, insulation and gravel stop, but defendant’s own contracting officer testified that a portion of the existing roof would have had to be removed to connect it to the new roof in any event. The scope of work for other items referred to in the demolition section includes qualifying phrases such- as “all” or indicates the [807] number or locations of items to be removed.