Window, Shopfront & Perimeter Weatherseal

Window perimeter sealants and weatherseals for aluminium windows, shopfronts, curtain walls, skylights and other glazing interfaces. This range covers flexible silicone and polyurethane sealants used to keep non-structural joints sealed against rain, air movement and building movement around glass, aluminium frames, masonry, cladding and façade systems.

Window and aluminium perimeter sealants

For mechanically fixed windows and shopfronts, the perimeter sealant forms the flexible weatherseal between the frame and surrounding construction. Typical applications include aluminium window perimeters, shopfront frames, curtain wall interfaces, frame-to-masonry joints, frame-to-cladding joints and other exterior glazing details where movement must be accommodated without losing the weather seal.

Choosing the right window weatherseal

• Adheseal PU15: a low-modulus polyurethane sealant for highly flexible window perimeter joints, curtain walls and façade weathersealing. Its softer Shore A 15 profile suits movement-sensitive glazing and aluminium details.
• Adheseal PU25 FC: a medium-modulus, fast-curing polyurethane sealant for window perimeters, curtain wall interfaces and broader construction joints where a firmer all-round sealant is preferred.
• DOWSIL 791 Weatherproofing Sealant: a neutral-cure silicone specifically suited to glazing, curtain wall and building-façade weathersealing, with high movement capability and excellent long-term weather resistance.
• Pasco Hypersil 911, SA Contractors and Adheseal N70: silicone options for compatible window, shopfront and glass-to-frame weathersealing applications.

Perimeter weathersealing is not structural glazing

These products are selected primarily to weatherseal around glazing systems and mechanically fixed window assemblies. They should not be assumed to carry structural glass loads. Where the sealant itself forms part of the structural glazing system, use a product and joint design approved for structural glazing and refer to our Structural & Fin Glazing range.

For broader façade movement joints, cladding interfaces and construction-joint sealing beyond window perimeters, see our Curtain Wall, Façade & Movement Joints collection.