Every building has a building envelope: office towers, schools, hospitals, residential buildings, industrial plants and government buildings. Ensuring envelope performance in a new building is a matter of delivering sufficient strength, resilience, resistance and impermeability to maintain two different sets of conditions: one on the inside and one on the outside.

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Improving the performance of an existing building generally concentrates on controlling air leakage and ensuring adequate and appropriate ventilation. With high-rises (anything over three floors), the pressure differences caused by stack, wind and mechanical effects, can create flow of air and moisture that cause many different problems. Among these are: High energy costs Drafts, uneven temperatures Transfer of odorus from floor to floor Moisture, mildew, condensation and mold Deterioration of building materials and cladding at air leakage points Good news… there are a variety of materials and techniques available to overcome these adverse pressure effects.

COMPLAINT STOPPER Dear Building Owner or Manager Are still getting complaints about DRAFTS? SMELLS? DIRT? PESTS? STATIC? NOISE?

If you are, we would like you to know that there is a way to solve these problems and save money at the same time. For Example:

Did you know that AIR LEAKAGE causes most of these problems?

Building air leakage is “uncontrolled migration of conditioned air through the building envelope”. This is air that you are paying to heat (or cool) and is escaping as a result of pressure differences. These pressures are created by wind, stack effect or mechanical systems. It directly causes most of these problems, as well as accelerating building breakdown or damage.

Many bank branches, including Royal Bank, Bank of Nova Scotia and Bank of Montreal, have used the services of to reduce dryness, static electricity, and fuel costs; while increasing employee comfort and productivity.

Controlling Air Leakage stops drafts, dirt, smells, noise, pests and reduces dryness:

Zerodraft controls leakage by using appropriate systems to find and seal gaps and holes with proven materials. This stops the unwanted air flow and prevents everything from noise, bad smells, such as second hand cigarette smoke and cooking, flies, and other insects from either getting into the building or moving around from one part of the building or another.


“Before Zerodraft came along to help us solve the problem, people on the second and third floor of your building suffered from cold drafts, low humidity in the winter and flies in the summer!

Gerry Tanner, Supervisor of Mechanical Maintenance, AECL, Mississauga.



Buildings with controlled air leakage have lower heating bills:

Air leakage has also been shown to represent the single largest source of heat loss (or gain) through the envelopes of nearly all types of buildings. Control it and you keep the heated (or air conditioned) air inside the building so you don’t have to pay to recondition it. Ventilation is provided mechanically in a controlled manner.

Controlling air leakage is a simple and clean building repair:

Envelope repair, or air leakage control does not disrupt occupants. In addition to reducing energy costs, it usually makes tenants happy by delivering “non-balance sheet” benefits such as a healthier, safer, comfortable and more durable building.



“Slough Estates Canada Limited, a national property developer, uses Zerodraft’s sealing methods to limit the migration of odor-laden air between industrial rental units when necessary”.
- David S Craig.



Do you want to reduce complaints and improve your building:

We can help. Our business is controlling air leakage by repairing building envelopes. This includes work such as re-weather sealing doors and windows of all types, sealing elevator shafts and mechanicals, plumbing service shafts, isolating underground garages and mechanical rooms, eliminating air leaks behind baseboards, and construction joints in roofs and walls.

When we have controlled the air leakage in your building, it will be more comfortable, cleaner and less of an irritation. The people who live and work there will be a lot happier and stop complaining, and the energy bills will probably be a lot lower.

Have us assess your building and put our experience and technology to work for you.