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Sill Extensions and Flashings

Sill Extensions and Flashings

Protecting against air and water leakage through the windows requires careful detailing. Window failures through water intrusion result in  indoor air quality issues to structural problems. Proper sill flashing will protect the wall and drain water away. The sill is your last line of defence against future big problems. Once the window is installed, a back dam has to be created with a continuous bead of sealant along the window frame and the sill to block any incidental water that may intrude in. 

The primary purpose of flashing under sills is to protect the wall below. If there is a moisture penetration problem, it is easier and cheaper to repair a sill than to repair the wall. In general, whenever flashing is installed in a wall, weep vents have to be created.. Without weeps, water may become trapped behind or under the sill, which could eventually enter the building or deteriorate the mortar and/or sill through freeze thaw cycles.

Extreme care should be taken to prevent sags, which may collect water and eventually leak into the wall insulation system or building. You should use rigid flashings, which are available online from facadeshop at competitive prices.

The Over Sill Flashing is designed to extend the length of an existing window sill, so that it overhangs the insulation. The purpose of this is to prevent water ingress behind the insulation, and to prevent serious damage to the insulation.

Over sill flashings and under sill flashings are used on top and the bottom of window openings and other openings to stop the rain water from directly attacking the insulation and render. 

Aluminium Verge profiles are designed to protect the system on gable ends and roof lines. Eaves Flashings are used on the overhang and at the edge of the roof to protect the facade from adverse weather conditions. They create a roof drip edge that helps channel water into a gutter or away from the facade. 

Usually avaiable in Aluminium White Coated with peel-off low tack film to protect the section during transportation and fixing on-site. Jointing clips can be supplied to retain the projecting nose of the section if required. Larger sizes or variations on any of these profiles can be manufactured to your specification, and powder coated to any standard RAL colour.

30mm Aluminium Window Sill Extension WEC 761 (with Full End Caps - pair) - 2.5m Length
Guide Price
Brand: Wemico Model: WEC761/30 - 30mm
Delivery Time: In stock, 1-2 days
30mm Aluminium Window Sill Extension WEC 761, powder coated to any RAL colours together with matching end caps, a ready made easy to use solution. Standard colour: white.             Dim 'A' = 30mm Gauge: 1.2mm..
Guide Price: £14.18
£17.02 inc VAT
30mm Eaves Flashing, Oversill and Window Sill Extension WEC721 (with full end caps-pair) - 2.5m Length.
New Guide Price
Brand: Wemico Model: WEC721/30- Free Delivery
Delivery Time: In stock, 1-2 days
30mm Eaves Flashing Oversill and Window Sill Extension WEC 721 is aluminium white coated as standard and can be powder coated to any RAL colours, a ready made easy to use solution for most conditions requiring the weathering of External Wall Insulation Systems and Rendering. Supplied together with m..
Guide Price: £18.46
£22.15 inc VAT
Brand: Wemico Model: WEC 771OT - 50mm - Free delivery
Delivery Time: In stock, 1-2 days
50mm Aluminium Verge Over Trim Profile WEC 771 is designed for use in situations where sealing the rear of the profile is possible. It has an increased drip section to improve visual appearance and a large front face to help prevent the water blowing up and soaking the insulation. It is manufac..
£19.02
£22.82 inc VAT
Brand: Wemico Model: WEC771 - 50mm - Free delivery
Delivery Time: In stock, 1-2 days
50mm Aluminium Verge Trim Profile WEC 771 is designed for use in situations where sealing the rear of the profile is possible. It has an increased drip section to improve visual appearance and a large front face to help prevent the water blowing up and soaking the insulation. It is manufactured..
£19.02
£22.82 inc VAT
50mm Aluminium Window Sill Extension WEC 751 (with Full End Caps - pair) - 2.5m Length
New Hot Guide Price
Brand: Wemico Model: WEC751/25 - 50mm
Delivery Time: In stock, 1-2 days
50mm Aluminium Window Sill Extension WEC 751, powder coated to any RAL colours together with matching end caps, a ready made easy to use solution. They are suitable for most conditions requiring the weathering of External Wall Insulation Systems and Rendering. Standard colour: white.   &nb..
Guide Price: £16.58
£19.90 inc VAT
50mm Aluminium Soffit Flashing and Window Sill Extension (with Full End Caps - pair) - 2.5m Length
Guide Price
Brand: Wemico Model: WEC741/50 - Free delivery
Delivery Time: In stock, 1-2 days
50mm Aluminium Soffit Flashing and Window Sill Extension powder coated to any RAL colours together with matching end caps, a ready made easy to use solution. Standard colour: white.                     Dim 'A' = 50mmGauge: 1.2mm..
Guide Price: £21.03
£25.24 inc VAT
25mm Aluminium Undersill Flashing and Window Sill Extension (with Full End Caps - pair) - 2.5m Length.
Hot Guide Price
Brand: Wemico Model: WEC731/25mm - Free delivery
Delivery Time: In stock, 1-2 days
25mm Aluminium Undersill Flashing and Window Sill Extension powder coated to any RAL colours together with matching end caps, a ready made easy to use solution. Standard colour: white.          Dim 'A' = 25mm..
Guide Price: £22.18
£26.62 inc VAT
Brand: Wemico Model: 50mm
Delivery Time: In stock, 1-2 days
50mm wide End Cap, manufactured in 1.2mm pre-coated white aluminium can be used with WEC 771, WEC 781, WEC 791 AND IGT range of verge trim profiles. A good quality sealant must be applied to the inside of the profile before sliding the end cap into position. Aluminium rivets should be used to secure..
£5.72
£6.86 inc VAT
Brand: Wemico Model: WEC 781- 50mm
Delivery Time: In stock, 1-2 days
50mm Grind in Verge Trim Profile manufactured from 1.2mm pre-coated white aluminium in 2.5m lengths that can be used where there are problems sealing the rear of the profile. It has an increased drip section and a large front face to help prevent the water blowing up and soaking the insulation. It i..
£27.00
£32.40 inc VAT
Brand: Wemico Model: WEC 791 - 50mm
Delivery Time: In stock, 1-2 days
50mm Verge Trim Upstand Profile, manufactured from 1.2mm pre-coated white aluminium in 2.5m lengths, has an up-stand that can be pushed under a barge board. This reduces the need for a mastic seal and removes future maintenance issues. It has an increased drip section and a large front face to help ..
£26.27
£31.52 inc VAT
Brand: Wemico Model: WEC732 - 60mm
Delivery Time: In stock, 1-2 days
60mm Undersill Profile WEC 732, manufactured from 1.2mm pre-coated white aluminium, in lengths of 2500mm, has an increased drip section to improve visual appearance and a large front face to help prevent water blowing up and soaking the insulation. The new design of drip also allows the end caps to ..
£23.99
£28.79 inc VAT
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