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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 has been cleverly designed 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 form by stretching it during the installation process. Once Gapseal is in the gap it will expand until it fills the entire width of the gap.

Wooden sash windows contract and expand throughout the course of their life. These variations 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 will mimic the movement pattern of the timber remaining in place retaining 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 experience and requires no adhesive, specialist skills or tools.

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.

The colour "Two-Tone Magnolia™ has been carefully developed to allow the gaps around sash window 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 100 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

13.99 inc VAT

11.66 ex VAT

Additional Application Tool

Do I need another applicator?

2.29 inc VAT

1.91 ex VAT

Sub Total:

£0.00 inc VAT

£0.00 ex VAT

FREE Standard Delivery

All UK orders are shipped FREE of charge and delivered in 2-3 working days by Royal Mail as standard.

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

Next Day Delivery

Orders can be upgraded to next working day delivery for
£4.50 inc VAT and will be delivered by UK Mail.

For delivery on order within the next
and choose next working day delivery.

International Delivery

We offer an international shipping service for customers looking to buy Gapseal from outside of the UK.

If you are intersetd in an internatinal delivery please contact our international sales team for a shipping quote.