Abstract: An insulating panel (1) comprises a first sheet (2), a second sheet (3) with an insulating foam (4) therebetween. The foam may, for example be a polyurethane foam, polyisocyanurate foam or a phenolic foam. The first and second sheets (2, 3) are metal such as steel, for example a galvanised or coated sheet. At least one reinforcing element (20) is provided within the insulating foam (body (4) and extends between the first and second sheets (2, 3). The reinforcing element (20) extends longitudinally along at least part of the length of the panel (1). For enhanced structural strength there are at least two reinforcing elements (20) which are spaced-apart between the side marginal edges of the panel (1). The reinforcing element (20) comprises a first flange (21), a second flange (22) and a web (23) extending between the flanges. The reinforcing element (20) is adapted to interengage with the insulating foam body (4) during manufacture.

Abstract: A roof panel (1) for use in forming a low pitch or flat roof comprises a profiled inner liner or decking sheet (2), an outer waterproof membrane (3) and a body (4) of insulation between the inner liner (2) and outer membrane (3). The membrane liner sheet (3) has a backing such as a fleece or scrim to aid adhesion of the membrane (3) to the foam body. The membrane (3) comprises a side lap (5) extending sidewardly of at least some of the marginal edges of the body (4). The inner liner (2) comprises joint formations for forming a nested side lap joint between adjacent panels. The joint formations comprise a first joint formation (20) at one edge of the liner (2) and a second joint formation (21) on an opposite edge of the panel. The first and second joint formations (20, 21) of adjacent panels are adapted to interengage on assembly and are clinched together using a clinching tool (22) to form a clinched joint (25). The first joint formation (20) comprises a liner extension which is shaped to define a recess.

Abstract: An insulating panel (1) comprises a first sheet (2), a second sheet (3) with an insulating foam (4) therebetween. The foam may, for example be a polyurethane foam, polyisocyanurate foam or a phenolic foam. The first and second sheets (2, 3) are metal such as steel, for example a galvanised or coated sheet. At least one reinforcing element (20) is provided within the insulating foam (body (4) and extends between the first and second sheets (2, 3). The reinforcing element (20) extends longitudinally along at least part of the length of the panel (1). For enhanced structural strength there are at least two reinforcing elements (20) which are spaced-apart between the side marginal edges of the panel (1). The reinforcing element (20) comprises a first flange (21), a second flange (22) and a web (23) extending between the flanges. The reinforcing element (20) is adapted to interengage with the insulating foam body (4) during manufacture.