External wall insulation installed recently?

Window sill turns out to be as well curt?


Windows provide any home with a clear view of the outside as well as reliable protection confronting inclement weather. If yous have quality windows fitted in your house, you are not planning to replace them shortly. However, when you lot decide to install outside insulation, everything changes. Although window may remain the aforementioned, merely the window sill turns out to be too short. Am I right?

You will then need to extend the sills during external insulation jobs.

The simplest and nearly effective way to extend the sill is to add a new sill over the top of the existing 1, with a bigger width to let the water to run off properly.


For customers that don't like UPVC we got an aluminum sill to offer. Thy tin exist pre-painted for you in all RAL colours. Pre-painted sill will not only friction match window color only also will provide a magnificent await to your property. Remember "the devil is in the details". No wonder people say that. They mean that minor things are important. In other words, details affair and when they are overlooked, bug with sills ascend. What will yous end up with? Cease of the twenty-four hour period it's all upwards to you .


Most of the London backdrop seems to have stone or tile sills. It means a piece of stone or concrete across the length of the window is fitted. Many installers find them tricky to extend, as they need to go on manner of the property.
Wemico ® Company offers perfect fashionable finish to all of those properties where yous need to proceed the appearance as similar as possible.

You tin can cull between:

Blazon 721- Oversill Eaves Flashing and Window Sill Extension

blue window sill extension

Type 731- Aluminium Undersill Flashing and Window Sill Extension

blue window sill extension type 731

Type 741- Aluminium Soffit Eaves Flashing and Window Sill Extension

blue window sill type type 741

Type 751- Aluminium Oversill and Window Sill Extension

blue window sill extension type 751

Type 761- O'sill Aluminium Window Sill Extension

blue window sill extension type 761

What is external window sill?

External window sill protects the masonry from accumulating moisture and grime and modern thermal insulation techniques also reliably foreclose harmful estrus bridges from forming.

How to extend an external window sill?

Perhaps you desire to know how to fit them?

When you install external wall insulation, you lot may notice that external window sill should exist wider than the thickness of the insulation layer on which it is installed. Yeah,that is right.

Window sill extender have to stick out from the wall to enable the water to run off properly when information technology rains. Without a window sill extender, the rain h2o tin can puddle and cause damp problems. Information technology should exist tightly connected with the window frame and so that during rain the water runs down the window and plaster onto the window sill, and and then onto the ground, not under the window.

In club for the water to baste downwardly, the external window sill should exist installed with a gradient of 1-2% to the outside. It must beetle 2.5-5 cm beyond the face of the wall.

Additionally, an important element of external window sills is an outer edge. It should always be profiled in a way that prevents water from seeping nether the window sill.

window sill outer edge

How to install window sill extension? Installation guide.

The window sill must non cover the woodwork drainage holes.

When installing external steel window sills, the following guidelines should be taken into account:

one.The window sill should protrude 30-forty mm beyond the finished facade.

ii. When cut the sill to size, protect the edges.

3. Aluminum window sills have a slight linear expansion (heating by fifty degrees Celsius causes an elongation of 0.5 mm), thanks to which window sills upwards to half dozen one thousand long can exist installed without an expansion joint.

4. In order to ensure proper drainage of h2o from the sill surface, a 5-degree inclination should be used.

5.The self-agglutinative protective motion-picture show should be peeled off immediately after installing the window sill.

6.The gap under the sill must be filled with low-expansion polyurethane cream. Information technology is a skillful idea to load the sill along its entire length correct after applying the cream.

Polyurethane foam must exist applied carefully, in pocket-sized portions. When too much of foam is practical, it tin can button the sill upwardly.

vii. Remove the protective pic from the window sill and secure it with silicone.

How to cut an aluminium sill?

Most oft, angle grinders, circular saws and jigsaws are used for this purpose.

The angle grinder works well when cutting aluminum, provided that a special cutting disc is used for this material.

Some other handy piece of equipment suitable for cutting aluminum is a jigsaw. In this case suitable saw blade must be purchased.

It is worth paying attention to whether the specification contains data about the possibility of cutting aluminum and the maximum thickness of the canvas.

A circular saw is a universal tool used in diverse types of workshops. It tin also be used for cutting aluminum, but equally with an angle grinder, you should cull an aluminum blade for it.

When cutting an aluminum, it is absolutely necessary to remember virtually personal protective equipment: glasses and gloves.


five things you lot'll need to install window sill

Before commencing installation of you windows sill you should bank check yous have all necessary materials and tools to complete the job. In particular y'all will need

  • Exterior silicone
  • Expanding (fixing) foam
  • Tape measure
  • Pencil
  • Caulk gun

We offer i of the widest ranges of sill extensions.

Extensive stock levels are held, enabling an fantabulous level of service, whilst also maintaining uncompromising quality.

All our Aluminum window sills are produced by the aluminum pulling method from structural alloys that meet the highest quality standards.

In addition to this, a specialist fabrication service is bachelor for unique specifications requiring made to measure details.