Coated steel window sills to drawing — exterior use

An external sheet metal sill combines protection below the window with an attractive façade finish. A suitable shape helps carry water beyond the wall face, while the colour can highlight the frames or blend gently with the render. SteelProfil offers sills sized to the building and helps plan details that work well at an individual window and across the whole façade.

Set the sill depth in relation to the final wall thickness, including insulation and finish. This allows the projection and drip edge to do their intended job while keeping the component in proportion. The folds next to the window and the side terminations matter too. Custom sizing is useful for new homes and refurbishment, where openings may differ in width or frame recess depth. A properly sized sill also fits naturally into an insulation upgrade because it can be coordinated with the new reveal depth from the start.

When choosing sheet metal, we consider how visible the surface will be and the conditions in which it will be used. Our wider range includes first- and second-grade sheets and panels, with selected materials available from stock. Lead times for custom sills are agreed separately. The material options allow you to compare finish quality and cost, while the characteristics of the actual batch must suit a visible façade component.

A metal sill can be colour-coordinated with gutters, roof flashings or the garage door. For buildings with many windows, a common surface finish gives the exterior a coherent appearance. The coating should suit outdoor use, and installation should provide proper support and a suitable window connection. Planning all the sills together helps maintain a consistent line and projection on each elevation.

• A suitable profile and drip edge help direct water away from the wall below the window.
• Made-to-measure fabrication makes it easier to fit the sill to the insulation thickness and window frame.
• A consistent sill colour brings visual order to all the building’s window openings.

The main information needed for a schedule is the length, depth and a drawing of the required cross-section. For renovation, allow for any planned changes to insulation and reveal finishes. We help organise these details so that each window receives the right component. Sills can also be ordered together with flashings for other façade areas, keeping the same material and shade throughout the work.

SteelProfil offers competitive prices and frequent promotions to help you assemble façade finishing materials economically. For larger orders, we compare the quantity of sheet metal and the components required to keep the quotation clear. Send your window schedule and desired colour, and we will match the sill proposal to your wall finish. The result is a detail planned for drainage and the appearance of the house, with dimensions settled before the final façade work.