SureSlope™ Pre-Cut Miters (MTR) are produced with a closed-cell polyisocyanurate (polyiso) foam core integrally bonded to non-asphaltic, glass fiber reinforced organic felt or inorganic coated-glass facers. Dimensionally stable SureSlope MTR provide a 4’x4’ (1220mm x 1220mm) pre-fabricated tapered valley or hip solution.