Aug 4 (Reuters) - British building materials supplier SIG reported a 31% slump in first-half profit on Tuesday, hurt by lower demand in a weak construction market and rising costs, and again warned its markets would not recover this year and possibly not in 2027.

The company reported underlying operating profit of £10.5 million ($14.10 million) for the six months ended June 30, down from £15.4 million a year earlier, but a touch above the £10 million forecast by analysts in a company-compiled poll.

($1 = 0.7446 pounds)

(Reporting by Amna Mariyam; Editing by Subhranshu Sahu)

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