Installing A Window Sill Extender

Dows before window installation.

Installing a window sill extender.

A permanent extender requires the installation of brackets into the wall studs beneath the window. Measure the distance between the two wall marks then add 1 1 2 inches to factor in your overhang on each side. Mark a reference line on the wall on each side of the window. Check this dimension against the shorter pieces of frame pocket filler.

Apply firm pressure to the adapter at the tape location to ensure proper adhesion to the window frame. To see hands on demonstrations of techni. Determine your window sill horn overhang. You can replace your entire window sill to get the space you want or you can simply extend the window sill you already have.

Use sandpaper to make sure the edge is flush and that it is smooth as well. 30 door 30 32 door 32 34 door 34 step 3 installing sill extender with the sill extender cut to the proper length attach the extender to the sill that is on the door system. Install filler by snapping leg of filler into. Sill extender is field trimmable for any necessary adjustments.

A sill extender is shipped with your order to allow height adjustments and is field trimmable. Measure across window from jamb to jamb at the head and sill. Step 1 finishing the current window sill. This measurement is your window sill length.

Casements and awnings are not compatible with a sill angle or head extender. I typically use for an overhang. The aluminum sill extender is sized for a 36 wide door narrower units will need to have the extender cut to the same size of the sill. Use a saw and cut the window sill flush with the wall on either side of the window.

Press the sloped sill adapter onto the sill of the window. If filler is too long trim to the measured length.