How do I extend an external window sill?

The simplest and most often used way to extend the sill is to add a new UPVC sill over the top of the existing one, with a bigger width to allow the water to run off properly. If the windows or the sill are plastic already, then this is often the option an installer will use.

Can you use PVC for window sill?

PVC moldings are weather-resistant, easy to work with, durable and ideal for exterior use. Nothing works better to finish off or replace a sill nose. The sill nose butts into the jamb or spacer and works to channel water away from the window.

How far should window sill extend?

The sill should extend 1½ to 3 inches beyond the jambs on each side of the window opening. On the chart to the right, look in the Window Width column to find the bracket in which the width of your window opening fits. The Sill Length column indicates the recommended sill length.

Which is the best PVC sill for Windows?

That’s why it’s so important to choose a PVC sill, most importantly a PVC sill with an accurate historic profile. Kleer Historic Sills, Replacement Sills and Sill Noses give your windows an authentic look on both the inside and outside of your home.

When to use uPVC for window sills and cover board?

They can be used in homes, including extensions and conservatories, and in outbuildings. UPVC is the material of choice for modern window sills and cover board. That is because traditional products made from wood have to under-go regular maintenance. They routinely need sanding down and painting or staining every three to five years.

How tall is PVC sill moulding in feet?

The Royal Mouldings 7 ft. x 1-3/8 in. x 1-5/16 in. PVC Sill Moulding is rot resistant. The pre-finished moulding can be painted to match the look of your home. Adding moulding to your home or office adds value and a nice finishing touch. The Royal Mouldings 7 ft. x 1-3/8 in. x 1-5/16 in. PVC Sill Moulding is rot resistant.

Can you put a sill on top of a window?

The SILL MOULDING fits under the bottom edge of the window to drain the water away from the window and building. It probably would not work to put a sill on top of a sill. I would probably remove all of the old trim and sill. Then you would replace the trim for the top and sides to join over the molding.