Description

Tapes and seals for joints

Even when boards and sheets meet the specification, a small joint can admit air or water. Tape and seals are used to connect the relevant layer across the gap. This matters particularly with PIR insulation, roof sheeting and lightweight cladding.

1 Connecting the surfaces of adjacent boards

On boards with a compatible facing, aluminium tape joins adjacent surfaces into a tighter layer. This limits air passing through the joints and bypassing the insulation. Board thickness alone cannot compensate for leaky connections. In a loft or similar assembly, sealing the facing as designed helps control air movement across the whole insulated surface.

2 Accommodating surface irregularities

Butyl tapes remain pliable and can fill minor irregularities where surfaces meet. Resilient gaskets are designed to work under compression. A suitable sealing layer can limit water entry at a metal sheet lap more effectively than the overlap alone. Select it for the surface, exposure and any small movements or vibration at flashings and panel joints.

3 Select the material for the exposure

Aluminium tape seals a compatible facing, a profiled gasket follows the shape of roof sheeting and a separation layer limits direct contact between surfaces. Suitable EPDM products resist UV, ozone and weathering where the detail is exposed. A tape not designed for the substrate or exposure may not last. The accessory works with the board and covering; it does not replace the design.

SteelProfil can help select tapes and seals for the materials being joined. Ask about stock and promotions when ordering accessories with insulation or roofing materials, including first- and second-grade options.