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How to Fit our Sash Window Gap Seal

Gapseal Window seal has been designed to address difficult gaps of varying thickness and in areas where windows either cannot be opened or have to slide up and down within a frame. Gapseal is very easy to apply:

Simply rake out any accumulated dirt with the handy applicator provided. Then start the installation of the Gapseal roll in a corner of the window. Then stretch the seal until it has the right thickness for the gap and push the seal into the gap with the applicator. Push it to about 2-3 mm depth below the surface of the window frame. Cut to length and push end into the gap.

Cleaning the sash gap using a screwdriver

Step 1 - Preparation

Before fitting Gapseal ensure that the gap between the window and the frame is clean and free from dirt and debris. Any dirt and debris can be removed using the applicator provided or an appropriate tool such as an old credit card.

A hand using an old credit to insert the first 1-2 inches of DraughtEx

Step 2 - Beginning the Application

Using the applicator provided push the end of the Gapseal into the gap at the end of the window frame. To make the first part of the installation easier the end of the Gapseal can be trimmed into a point using a pair of scissors, this will allow the end of the seal to be pushed into the window gap easily.

A hand using the applicator to insert Gapseal into the gap

Step 3 - Fitting the seal

Stretch the windows seal as much as necessary to fit into the gap without excessive force. The resistance to the applicator should be comfortable. Work a short section at a time! Repeat this process over the length of the window gap. The ideal depth is 2-3 mm below the surface of the window frame.

Gapseal being cut to size with household scissors

Step 4 - Cutting to Size

Once you have sealed the full window and reached the end of the gap, cut the seal leaving around 1 inch surplus length (this is done to prevent gaps being created at a later stage) using a pair of household scissors and push the seal into the gap using the applicator.

A hand not maintaining a safe distance from the applicator to reduce the risk of injuries

Safety Tip - Avoid Injury Risks

The Gapseal application tool is designed to avoid injuries. However, excessive force or using the tool not as intended can result in injury. Never work the applicator towards your face. Please store the applicator away from children.

Buy Gapseal Now

Gapseal is available in 10m rolls and each order is supplied with a FREE application tool.

Gapseal 10m Pack Suitable for 2 - 7mm gaps 13.99 inc VAT

Additional Application Tool Do I need an additional applicator? 2.29 inc VAT

Each order is supplied with 1 x FREE application tool as standard

Shipping Only: 1.99 Per Order (inc VAT)
Sub Total: £0.00 inc VAT
Beginning the installation of Gapseal Gapseal fitted to a sash window A finished window after gapseal has been installed