Fitting Sash Windows

Sash windows are becoming more and more popular every year.

They can give your home the right balance between a traditional and modern style.

The problem is that sash windows have a bit of a reputation for being difficult to fit and maintain.

They often need replacing but this doesn’t have to be the case.

To help our customers, we’ve written this brief guide on fitting replacement sash windows to help you out.

Measuring the frame

First of all, you need to measure the frame that is already there in the wall.

Make sure you measure straight across from the jamb to the opposite jamb for the width.

Then measure from the sill to the head jamb for the height.

Removing old sashes

Now you need to pry off any window stops on the sides of the sashes.

Locate the lower sash, pull it out, and disconnect the chain.

Next is the parting bead, a trim in a recessed sort of groove – remove it in pieces and discard them.

The upper sash needs to be removed as well, and also disconnect the chain like before.

The pulleys need to be removed next but you can discard them straight away.

Inspecting the frame

Take a look at the existing frame – is it in good condition?

Replace or repair the rotted sections, and make sure the head and sill jambs are both level.

Lastly, check that the side jambs are both plumb.

Jamb liners

Install the liner clips.

You need to check the manufacture’s specifications, but usually one is needed about four inches from the head jamb and another at four inches up from the sill.

Place several more in between this – the number is based on the height of the window jamb.

The clips can be installed by putting them up against the outer window trim, then taking them back about an eighth of an inch.

Drill a hole for starters, then put your nail in place using one-inch roofing nails that are galvanised.

Make sure you don’t get the nails in too tight – if you do, you might not be able to move them around if necessary.

Also make sure to install the brackets evenly to ensure the tabs fit in the jamb liners. On each side, snap the jamb liner into place.

Installing the sashes

The top sash is the best place to start – tilt it into the opening and engage the lower pin in the metal cam in the liner.

The other side needs to be lowered until the pin also hits the metal cam.

Lift the sash, push the jamb liner, and ease the sash to its position.

Do this for the lower sash as well now.

Get in touch

We hope we’ve given you some helpful information of fitting sash windows.

It can be tricky, but with the right knowhow, you’ll get the job done.

If you any have further questions, don’t hesitate to get in touch.