JLM composites origins in the home improvement market have since diversified to meet the demands of the growing construction industry JLM Composites, 47a Gortnagola Rd, Donaghmore, County Tyrone, BT70 3BD,, Northern Ireland JLM Composites Providing innovative GRP components to Irish and UK Industries Ldquo;As a recognised leader in the production of GRP building solutions JLM composites is regarded as the primary source of innovative GRP components to the Irish and UK construction industries