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What is Gapseal?

Gapseal is a proven sash window gap filler which is designed to reduce cold draughts created by the gaps around your sash windows and improve the comfort and energy efficiency of your home.

How Does it Fill Window Gaps?

Gapseal sash window gap filler has been cleverly manufactured with thousands of tiny, concealed air pockets which allow it to be compressed by almost 90% of its original profile.

These flexible properties allow Gapseal to be easily fitted into sash window gaps much smaller than its original width by stretching and compressing it during the installation process. Once the sash window filler has been inserted into the gap it will expand until it fills the entire width of the gap.

Wooden sash windows naturally contract and expand throughout the course of their life. These variations often create varying gap widths which can cause alternative methods such as scrunched up newspaper to fall out or absorb moisture which can lead to rotting and discolouration.

Gapseal can easily be removed when the window needs to be opened and is designed to expand and contract with the movement pattern of the timber and will therefore remain in place retaining the insulation.

Easy Fitting with No Mess

Gapseal has a profile of 8mm and is suitable for sash window gaps between 2 and 7mm. Our quick and easy fitting process can be completed by any competent person with limited DIY knowledge or experience and requires no adhesive, specialist skills or tools. We have also created a helpful installation video to demonstrate the fitting process.

Every order is supplied with a FREE applicator which is specially designed to push Gapseal into the gaps around your sash windows without damaging them.

Natural "Two-Tone" Appearance

The design of Gapseal follows extensive research and testing which has been carried out to ensure that the product is not only efficient but also aesthetically pleasing when installed into the sash window gaps.

The colour "Two-Tone Magnolia™" has been carefully developed to allow the gaps around sash windows to be sealed without compromising the natural appearance of the window.

Do You Have Draughty Floorboards Gaps?

Cold draughts created by the gaps between floorboards can also lead to chilly and uncomfortable rooms and increased heating bills during the winter months. Even rooms that have carpet and underlay fitted often have gaps between the skirting board and the floorboards that allow significant heat to be lost.

Traditional floorboard gap filling techniques and products are time consuming, messy to install and will often fall out over time. DraughtEx is a proven floorboard gap filler, designed to reduce the cold draughts and improve the comfort and energy efficiency of your home.

Our Customers Love Gapseal

4.5 / 5 Stars

Read reviews from 184 customers who've installed Gapseal to eliminate draughty windows and make their homes warmer.

Buy Gapseal Now

Gapseal 10m Pack

Suitable for 2 - 7mm gaps
More than 20 in stock Expected dispatch: Today

£13.99 inc VAT

£11.66 ex VAT

Do You Need to Fill Different Size Gaps?

If you are looking to fill floorboard or skirting board gaps that can't be covered by this size of Gapseal we offer a full range of different sizes to suit all gap widths.

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£0.00 inc VAT

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FREE Economy Delivery

All UK orders are shipped FREE of charge and delivered in 3-5 working days by Evri by Hermes as standard.

Please Note: Deliveries to islands and remote locations can take an additional 1-2 days to be delivered.

Express Delivery

Orders delivered in 1-2 days by DHL from £4.50 inc VAT.

Please Note: Deliveries to islands and remote locations can take an additional 1-2 days to be delivered.