Best Removable Draught Excluder for a Sash Window

Sash windows leak air along the moving meeting rail and around the frame, so the right product has to seal a sliding gap without gluing the sash shut. This short roundup covers five removable draught excluders that handle that job in different ways, from brush pile for the sash channel to clear film tape for the glass edge. The picks suit renters who cannot drill, owners restoring old timber sashes, and anyone sealing one cold room on a budget. The overview table below puts all five side by side so a decision can be made in under a minute.

Overview of the Picks

Product	Key Spec	Best Use	Price Tier
16 Ft Sliding Sash Windows Brush Seal Strip	5mm x 12mm brush pile, 16 ft roll	Sash channels and meeting rails	Budget
Alien Draft Seal Set of 49 Feet	Adhesive flexible flap, 49 ft	Wide gaps around frames and doors	Mid
Clear Weather Stripping Seal Strip	35mm wide silicone, 33 ft total	Transparent seal on frames and glass	Budget
Holikme 4-Pack Draft Blocker	65 ft total, strong adhesive, clear	Multi-window jobs and shower glass	Mid
Weather Stripping Tape	2 inch x 90 ft, clear	Window gaps and AC units	Budget

1. 16 Ft (5m) 196 Inch Sliding sash Windows Doors Tape Pile Draught excluder Brush Seal Strip weatherstrip 5mm x 12mm (3/16 1/2 Inch, Gray)

Type: Brush pile seal strip
Profile: 5mm x 12mm
Length: 16 ft (5m)
Color: Gray

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This is the pick that understands how a sash window actually works. The strip is a dense brush pile mounted on a backing tape, and the brush flexes against the sash as it slides rather than gripping it. That means the window still opens, but the airflow through the channel is blocked. It is the closest thing in this list to the original brush seals fitted to timber sashes.

It suits owners of older sash windows where the gap between the sash and the frame is narrow and consistent. The gray color disappears into a painted channel, and the roll is long enough to run down both sides and across the meeting rail. The trade-off is that brush pile is a narrow-gap product; a badly warped sash with a wide, uneven gap will need something bulkier.

2. Alien Draft Seal Set of 49 Feet Anti-Draft Adhesive and Flexible Flap to Seal Gaps Around Doors and Windows As Seen On TV

Type: Adhesive flexible flap seal
Length: 49 ft
Application: Doors and windows
Format: Set

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The Alien Draft Seal uses a flexible flap rather than a brush or a foam strip. The flap sits over the gap and bends as the window or door moves, which makes it forgiving on frames that are not perfectly square. The adhesive backing means it goes on without tools, and the 49 ft set covers several windows or a window plus a door.

It suits buyers dealing with wider, uneven gaps where a thin strip would not bridge the opening. The flap format is also easier to remove than a glued foam tape, which matters for renters. The trade-off is that a flexible flap is more visible than a clear strip and can catch on a sash that is pulled sideways rather than lifted straight.

3. Clear Weather Stripping Seal Strip for Doors and Windows – Draft Stopper for Frames, Glass & Gaps | Transparent Silicone Insulation Seal (35mm Wide, 10M / 33Ft Total, 2-Pack)

Type: Transparent silicone seal strip
Width: 35mm
Total length: 33 ft (2-pack)
Application: Frames, glass and gaps

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This is the discreet option. The strip is clear silicone, so it seals a gap without changing the look of a period window. At 35mm wide it covers a broader band than a thin tape, and the two-pack gives 33 ft in total, enough for several sashes plus a door frame.

It suits buyers who care about appearance as much as draughts, and anyone sealing glass edges where a visible strip would be an eyesore. Silicone also stays flexible in cold weather, which is when the seal matters most. The trade-off is that a wide clear strip is more noticeable up close than the marketing suggests, and it will not compress into a very narrow sash channel the way brush pile does.

4. 4Pack Draft Blocker for Doors, Windows, Shower Glass – Strong Adhesive, Draft Seal Strip, Transparent Holikme 65FT Weather Stripping Door Seal Draft Stopper Window Seal

Type: Transparent adhesive draft seal strip
Total length: 65 ft
Format: 4-pack
Application: Doors, windows, shower glass

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The Holikme set is the volume pick. Four packs totaling 65 ft means a whole house of sash windows can be sealed from one purchase, and the strong adhesive is aimed at strips that stay put through a season of opening and closing. The clear finish keeps it low-profile on painted frames.

It suits buyers sealing multiple windows at once, or anyone who wants spare strip on hand for next winter. The shower glass listing also makes it a reasonable pick for a bathroom window that sees moisture. The trade-off is that a strong adhesive cuts both ways: it holds well, but it can lift paint or leave residue when the strip is removed, so a test patch on a hidden edge is worth the two minutes.

5. Weather Stripping Tape, To Stop Drafts Through Window Gaps and AC Units, Insulation Seal for Home and Air Conditioners Window Weather Sealing Tape (2 Inch Wide x 90 Ft, Clear)

Type: Clear weather sealing tape
Width: 2 inch
Length: 90 ft
Application: Window gaps and AC units

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This is the cheapest way into the list and the longest roll by far. The 2 inch clear tape is designed for the gap between a sash and its frame, and the same roll seals a window-mounted air conditioner, which is where a lot of winter draughts actually come from. At 90 ft there is plenty left over for a second room.

It suits budget buyers and anyone sealing a window AC unit for the season. The tape is also the simplest product here to apply and remove, which helps renters. The trade-off is that plain tape is the least durable option on a sash that is opened daily; it is better suited to a window that stays shut for the winter than one in constant use.

Before You Buy

• Material: Brush pile flexes in a sliding channel, silicone stays flexible in cold, and plain tape is the least durable on a window opened daily.
• Gap width: Measure the gap at its widest point; brush pile suits narrow channels, flap seals and wide strips suit uneven openings.
• Sash movement: Any seal on the moving sash has to let it slide; test the window through a full open-and-close cycle before trusting the seal.
• Adhesive and finish: Strong adhesive holds better but can lift paint on removal; clear strips are less visible but still noticeable up close.
• Coverage: Total length matters more than pack count; a 90 ft roll covers more windows than a 4-pack of short strips.
• Removability: For renters, prefer flap or tape formats that peel away cleanly over high-tack strips.
• Season: Seal before the cold sets in; adhesive bonds better on a dry, mild day than on a frozen frame.

Frequently Asked Questions

1. Will a draught excluder stop a sash window from opening?
   No, if the right format is chosen. Brush pile and thin clear strips are designed to let the sash slide while blocking airflow; a thick flap on the moving sash is the one to avoid.

2. What is the best removable draught excluder for a sash window?
   Brush pile strip is the best match for the sash channel, while clear silicone strip suits buyers who want a discreet seal on the frame and glass.

3. Can these products be used on rented windows?
   Yes, most can, but strong adhesive strips may lift paint on removal. A test patch on a hidden edge is the safe approach.

4. How much length is needed for one sash window?
   A single sash typically needs strip down both sides and across the meeting rail; a 16 ft roll covers one window with a little spare.

5. Does clear tape work on a window air conditioner?
   Yes, the 2 inch clear weather tape is listed for window gaps and AC units, and it seals the gap around a window-mounted unit for the season.

6. When should the seal be replaced?
   Brush pile flattens and tape loses tack over time; a seal that no longer blocks a tissue test at the gap has done its job and needs replacing.

Bottom Line

For a sash window, the brush pile strip is the pick that matches the window’s own design: it seals the sliding channel without stopping the sash, and it is the cheapest product here. Buyers who want a discreet clear seal on frames and glass should look at the silicone strip instead. The 16 Ft Sliding Sash Windows Brush Seal Strip is the top choice for most sash windows.