DIY Draught Sealing — Double-Hung Windows

Sellaseal · DIY draught-sealing kits · Australia-wide

25,000 windows sealed.
Now it's your turn.

Sellaseal puts the exact seals, beads and cords trusted by Sealasash — the specialists behind 25,000+ timber window installs — into a kit you can fit yourself. Delivered anywhere in Australia.

Shop the double-hung kit → See how it works
Founded by Sealasash — the window people, not the window replacers.
Sellaseal double-hung window draught sealing kit for timber sash windows
25,000+
Windows sealed across Australia
4.9
Average rating, 180+ reviews
2011
Sealasash established
AU
Kits delivered nationwide
Who we are

The pro products, finally in your hands.

Sellaseal is the trading arm of Sealasash — the team that restores and seals Australia's original timber windows every working day. Sealasash does the installs; Sellaseal exists so that everyone, everywhere in Australia, can buy the exact seals, beads, cords and hardware those carpenters trust on the job.

No watered-down consumer versions. No mystery hardware-store strips. The same professional-grade system, boxed with step-by-step instructions and delivered to your door.

Our story

Perfected one sash at a time.

Sealasash began in 2011, built on decades of combined sealing solutions across our directors — and the craft was learned in real Australian homes: federation terraces, Victorian cottages and grand old weatherboards, many with windows that hadn't closed or opened properly in decades.

Across 25,000+ window installations — including extremely heritage-sensitive buildings, where there's zero margin for damaging original fabric — our carpenters met every problem a hundred-year-old sash can throw at you, and tested every seal, bead, brush and cord on the market. Only what lasts made the cut. Our motto says it plainly: no seals, no deal.

Sellaseal was created to share exactly that — the products that survived 25,000 installs — with every home in Australia, whether or not a Sealasash carpenter can get to you.

The problem · double-hung windows

Your window isn't cold because of the glass.

It's cold — and noisy — because air leaks around the pane, through the operating gaps that let the sashes slide. These are the four points that matter.

Sealasash core service diagram showing where draught seals are fitted on a double-hung sash window
Double-Hung-Core-Service.png
Your core-service diagram displays here on the live site.
Where we seal a double-hung — the Sealasash core service.
01 · Sides

Where the sashes slide

Discreet twin-fin brush seals so the sash still glides, but the air gap all but vanishes.

02 · Parting bead

The channel between sashes

The run the sashes travel in — a constant source of cold air movement when it leaks.

03 · Meeting rails

The join in the middle

One of the biggest leak points for both air and noise — and the source of that whistle.

04 · Staff beads

The room-side perimeter

Seals the inside edge and kills the rattle when a truck rolls past.

The quiet truth

Seal the gaps, and your glass can finally work.

Most people jump straight to glass. But in a double-hung, much of the noise and cold comes around the pane through the operating gaps — acoustically, they're open doorways. In lab conditions, the twin-fin brush system alone accounts for roughly a 6–10 decibel acoustic improvement (real-world results vary with window and fit). Seal first, and any glass — single, double or vacuum — can finally do its job.

Read the full article on Sealasash →
What we've perfected

Three things, done properly, on every window.

Step 01 · Function

Make it work

Re-cord and free the sashes so the window opens, closes and seats the way it should. A seal on a window that won't move is wasted.

Step 02 · Seal

Close the leak paths

Fit brush seals, beads and a meeting-rail track to the exact points air and noise bypass — working with the sliding sash, never against it.

Step 03 · Discretion

Leave no trace

The seals become built into the working window. From the room it still reads as a traditional timber sash — just warmer and quiet.

The kit · Australia-wide access

The professional kit, boxed for you.

We can't send a carpenter to every home in Australia — so we packed the double-hung system into a single kit and made it available everywhere.

  • + White-primed timber staff bead (2×2m + 2×1m)
  • + White-primed timber parting bead (2×2m + 1×1m)
  • + Twin-fin brush seals, white — beads & meeting rail (11m)
  • + Meeting-rail track (1m)
  • + 10m hank of premium 6mm sash cord (cotton over poly core)
  • + Step-by-step instructions
$168 AUD · single kit · suits windows to 2m × 1m
Get your kit →

For painted timber double-hung windows on cords. Best for the confident DIYer happy to pull the sashes apart.

★★★★★

The system behind 25,000 sealed windows — now in your hands.

4.9 / 5from 180+ verified reviews
25,000+windows sealed nationwide
Heritagetrusted in the most sensitive buildings
Endorsedtwin-fin approach backed by acoustic engineering
Australia-widekits to your door

Same window.
Warmer and quieter.

Stop shoving newspaper in the gaps. Get the exact kit that's sealed 25,000 windows and give your old sashes the upgrade they've waited decades for.

Shop the double-hung kit → Prefer it installed? Visit Sealasash