Exterior Window Surrounds
An exterior surround is the set of profiles applied around window and door openings to frame them; it typically consists of side jambs, a head lintel, a keystone and a sill below. Thanks to its closed-cell structure a polyurethane surround absorbs less than 1% water, so it is unaffected by the water and frost load at the window edge. Because the profile closes the transition between joinery and wall, it also reduces thermal bridging.
How are surround measurements taken?
What is the most common installation mistake?
How is it combined with sills and keystones?
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Frequently Asked Questions
Is the surround applied over the window frame?
No, it is applied to the wall surface around the frame. The profile sits adjacent to the window frame but must not overlap it, otherwise sash operation and gasket function are affected.
Does a surround provide thermal insulation?
A surround is not an insulation product; however, by closing the transition between wall and joinery it reduces the thermal bridge at the window edge. Closed-cell polyurethane inherently has low thermal conductivity.
Can surrounds be applied over external wall insulation?
Yes. The surface must be sound and even, the adhesive applied in an uninterrupted bead, and mechanical screws planned so that they reach the load-bearing layer.
How often does a surround need maintenance?
The product itself needs none; there is no rot or insect problem. Maintenance depends on the topcoat: a UV-resistant elastic facade paint is renewed at the interval specified by its manufacturer.
Are non-standard sizes and profiles produced?
Yes. Non-catalogue sections and motifs can be produced by mould machining or CNC; a quotation requires window dimensions, a facade photograph and the location.
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