Stop Rattles and Drafts in Sash Windows - the Rumple




Introduction: Stop Rattles and Drafts in Sash Windows - the Rumple

In a Perfect world, your sash windows would be a perfect fit.
There would be no gaps, and the windows would slide up and down with zero friction.
When first fitted, your sash window would have been pretty efficient.

However, in the real world, your sash window fits badly.
Years of use have caused wear on the moving parts.
Staff beads have been adjusted to close up the gaps, while still allowing the windows to slide freely.
Cold air and noise enter through the gaps - shown in blue below.
The lower pane is most frequently used, and is therefore the most worn part of the window.

By fitting the RUMPLE, the window frame is pressed against the parting bead.
This closes the gap and prevents air and noise from entering your home.

The Problem.

The solution.
The Rumple

The Rumple fixes on to the staff bead.

By turning the threaded screw, the window is pushed lightly against the parting bead of the window, eliminating drafts and rattles.
Materials are easily sourced for pennies, and you may find that you have many of them in your toolbox already.

Step 1: Materials

Modesty Block - AKA

                 Jointing Blocks
                 Knock Down Block
                 Knock Down Fittings
                 Fixit Block
                 Fixing Block
                Cabinet Fixing Block
Machine Screw – Pan Head M5x 30mm
M5 Tap from Tap & Die set
Cordless Drill
25mm Drywall screw
Drill Press

Step 2: Preparation:

You need to machine a thread into the modesty block.
Very easy – run the M5 Tap into the block using the drill.

You need to cut the machine screw to the right length using a hacksaw
You need to cut a slot into the screw so that you can turn it with a screwdriver.

Step 3: Assembly

Assemble the Rumple as shown in the photo

Step 4: Fitting.

Position the Rumple 3 inches from the top of the lower pane.
Drill pilot holes into the staff bead.
Screw the Rumple into the staff bead.
Push the window against the parting bead with one hand while turning the adjusting screw until it just catches.

Do the same on the other side of the window.
Stand back and admire your work.

Step 5: Benefits

The first effect is that the window stops rattling.
Then you notice that the room is quieter.

When it gets cold, you will find that drafts have been reduced.

Rumples are pretty easy to make, but  if  you want to buy readymade rumples, send me an email at

I will sell them on eBay

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    4 Discussions


    8 years ago on Introduction

    it's not free, unless you add up the money you will save on energy bills, but StopGap is very simple to use and it works:


    8 years ago on Introduction

    Having been raised in an old house with sash windows, stopping the rattle is a big thing. However, wouldn't it be easier to take one of these:
    throw away the pin and attach the rollers hard against the window? At least that way it would be able to open the windows easily.


    Reply 8 years ago on Introduction

    Nice Idea.
    I looked at spring loaded ball catches too.
    With your idea, the windows would be easily openable without scratching the window frame.

    However, I found that I needed to make the Rumple completely adjustable.
    Some gaps are pretty big!
    Using the screw means that you can get the window just right.
    It does mean that you need to have a screwdriver handy to open the window.


    Reply 8 years ago on Introduction

    Mount a L-shaped piece of metal on the front of your rumple's thread somehow, and have the L sweep back over the rumple's body. Then fit the spring catch to the L?

    That way you'd have a large adjustment using the thread, but the spring catch flexes back enough that you can open and close the window.