Sealing doors and windows from the weather is more demanding than it may seem. Strong winds create 'pressure drops' at doors and windows where the air pressure difference between inside and outside literally sucks water and cold air into the building or forces warm air to leak outside through any gaps and cracks in the door or window.

Simpler designs of threshold seals (such as Cyclone) create an effective barrier to the passage of air and water through doorways but once rain has dripped from the bottom of the door leaf or blown inside as the door is used, there is no means for it to escape.

For door thresholds particularly exposed to rainwater, Sealmaster developed the Watershed range which incorporates discrete troughs to collect dripping water and channel droplets back outside.

The advantage of redirecting water back outside came at a small cost to the seal's air leakage performance since air could leak back through the water outlets. SmartSeal technology overcomes this by including a one-way valve. This allows the water to drain away whilst preventing cold air and or droplets from being sucked back through into the building.

Until now, threshold seals have tended to be designed to perform best in air leakage tests (at the expense of not draining water) or are obliged to strike a balance between performance on water-tightness and on air leakage. SmartSeals overcome the problem by switching the way they operate to give the best performance whatever the weather.

In heavy rain, SmartSeals collect surplus water and drain it back outside. When gusts of wind attempt to force air back through the drainage outlets, they close until the pressure of water inside the collection trough rises above the air pressure outside to reopen the outlets and enable water to drain away. We called it SmartSeal Technology because the products respond automatically to the weather conditions as they change at the threshold of each doorway.

Surplus water droplets at the bottom of the door are wiped by the two elastomeric blades in the timber (or aluminium) weatherboard section of the seal through a semi-porous lid into the collection trough. The inclusion of a lid which allows the water through but keeps dirt out cuts the risk of tripping presented by a broad open channel and is easier for wheeled traffic to negotiate.

The SmartSeal range is unique in combining the latest sealing technology with traditional timber weatherboards discretely.

A very high performance combination seal, with hidden fixings, for inward or outward opening external doors of either single or double leaf design.

The low-rise SmartSeal threshold section with Sealmaster's patented valve-controlled drainage ensures ease of access with maximum weather protection.

The SmartSeal threshold section is available in two versions: one for timber or vinyl floor finishes (section TB) and the other for carpet finishes incorporating a square edge to butt against the carpet (section TA).

The SmartSeal threshold drainage trough is covered to prevent a tripping hazard. A range of weatherboard and contact strip options is available in a choice of finishes to suit both traditional and contemporary door designs.

For outward opening doors the contact strip is fitted to the inside face of the door and is a discrete section, which does not detract from the style of the door.

The threshold, weatherboard and contact strip sections all utilise covers to hide their fixings and ensure clean, crisp, lines.

SmartSeal seals can be used with virtually all Sealmaster stop seals.

e.g Sealmaster SmartSeal TAS/CAS (for threshold / contact strip) or TAS/WAS (for threshold / weatherboard) to suit door in .......mm wide opening. Threshold to be bedded in silicone and fixed to floor with screws/plugs. Contact strip (or weatherboard) to be fixed to door with screws.

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