How retrofitting high-density pile carrier systems stops Fremantle rattles and cuts household heat leakage by up to 88% without visual alterations.
One of the primary complaints about old double-hung windows is that they are drafty and noisy. When the ‘Fremantle Doctor’ blows in off the ocean, many Perth homes suffer from howling breezes, whistling currents, and annoying structural rattles from their window frames. Homeowners often try to solve this by purchasing sticky-back foam strips or felt tapes from the local hardware shop. Within a few months, these foam pads disintegrate, sticky residues jam the window track, and the sashes become impossible to open.
To understand why sash windows leak air, we must understand their physical tolerances. Original joiners left a gap of 2mm to 4mm between the sliding sash wood and the vertical channel guide beads. This gap was essential to allow the timber to breathe—expanding in winter’s humidity and shrinking in summer’s dry heat—without locking up. Unfortunately, these gaps represent a permanent open door for thermal drafts, coastal dust, and external street noises.
The answer is not sealing the window shut, but rather retrofitting a hidden draught-seal system. Our system works by plowing high-density weatherproofing carriers directly into the physical timber beads that frame your sliding sashes. Using custom, hand-guided routering tools, our master carpenters carve out small, hidden tracks along the parting beads, staff beads, and horizontal meeting rails.
We then feed a high-performance, silicone-fin polypropylene brush pile into these routed channels. The weather-pile is completely hidden from view when the window is closed, preserving 100% of the historic exterior lines. When the window operates, the soft polypropylene fibers slide silently and smoothly against the sash rails, keeping them perfectly steady and stopping rattles completely, even in heavy WA winds.
The impact of these seals on your home’s thermal footprint is profound. Laboratory and field tests indicate that retrofitted pile systems decrease cold draft air infiltration by up to 88%. This converts your single-glazed heritage window into a comfortable thermal barrier, reducing your winter heating bills and summer air-conditioning loads dramatically, while reducing acoustic traffic hums by up to 10-15 decibels.