At the hearing on defendants’ motions for summary judgment they presented much evidence, expert and otherwise, tending to show that plaintiffs did not properly erect the steel for their building and are liabile to them for the structure’s collapse. In gist, their evidence tends to show that the framing collapsed in wind of only 27 miles an hour due to two failures on plaintiffs part — the failure to adequately brace the steel framing, as the North Carolina State Building Code requires, and the failure to tighten various bolts that held the different parts of the framing together. The main question presented by plaintiffs’ appeal is whether their forecast of evidence materially contradicts defendants’ evidence as to the particulars stated, and thus raises a question of material fact for the jury. We believe that it does and vacate the order of summary judgment.
In pertinent part the affidavit of the plaintiff Gerald Raynor is to the following effect: He has twenty-two years experience in steel construction and is familiar with the generally accepted steel erection practices and procedures in this state. The drawings for many pieces of structural steel used in the building did not show bolt connections and required welding to hold them in place but before the steel could be welded it had to be erected and plumbed. York provided only two anchor bolts for each steel column, installed the bolts in concrete blocks not strong enough for the purpose, and one of the columns could not be firmly attached to an anchor bolt because the bolt was loose inside the block that it was embedded in. He told York Construction’s site *656superintendent, Mr. Little, that he was concerned that the structural steel had not been designed strong enough, it didn’t have sufficient bracing, and the foundation was not strong enough to hold up the steel; Little told him to go ahead with his work and that York wanted the steel erected as soon as possible. During construction he discovered that many pieces of the structural steel were too long or too short and the holes for some connections were too big or misaligned; because of the defects he could not make the steel pieces fit snugly against each other, and the connecting bolts did not fit some of the holes. These fabrication errors were also called to York’s attention and he was again told that they were in a hurry to complete the building and he should complete his work without further delays. On 27 July 1984 he had erected basically all of the structural steel and had properly tightened, bolted and braced the structure. He saw the collapsed steel and in many places the two anchor bolts had pulled out of the concrete block causing the columns to fall. In his opinion the structure collapsed because it was not designed properly and because of the fabrication errors and insufficient footings described.
This forecast of plaintiffs’ proof at trial clearly raises issues of material fact for a jury and the court’s ruling to the contrary is error. It tends to show, inter alia, that plaintiffs substantially performed their agreement and duties, and that they properly tightened and braced the frame; that defective materials furnished by defendants were used upon their instructions; and that the structure fell because defendants’ footings, fabricated steel and design were defective. Nor is the judgment necessarily correct, as defendants argue, because defendants’ proof indicates that the State Building Code was not complied with and there is authority for the proposition that the Code holds the erector strictly liable for properly bracing and tightening a steel frame under construction. Lindstrom v. Chesnutt, 15 N.C. App. 15, 189 S.E. 2d 749, cert. denied, 281 N.C. 757, 191 S.E. 2d 361 (1972). For plaintiffs’ forecast of evidence gives rise to the legal principle that a subcontractor is not liable to his contractor for using the contractor’s materials and following the contractor’s instructions. Burke County Public Schools Board of Education v. Juno Construction Corp., 50 N.C. App. 238, 273 S.E. 2d 504, aff’d, 304 N.C. 187, 282 S.E. 2d 778 (1981); 17A C.J.S. Contracts Sec. 515 (1963). But, of course, which of the many legal rules that could apply to the case actual*657ly do so will depend upon the view that the jury takes of the evidence when it is presented to them. Which is why issues involving negligence, proximate cause, reasonableness and the like can seldom be correctly determined by summary judgment. Lamb v. Wedgewood South Corp., 308 N.C. 419, 302 S.E. 2d 868 (1983). Thus, the judgment entered is vacated in all respects.
Vacated.
Judges PARKER and COZORT concur.