Quebec Real Estate Tips
Insulation is the material which controls heat transfer through the envelope of the building. A reduction of heat loss in winter allows energy savings and, in summertime, heat gain reduction lowers air conditioning requirement for the building.
Due to low energy cost prior to seventies, building envelopes had low insulating capabilities. In these cases, it will be advantageous to retrofit the existing wall assembly, adding onto the existing insulation.
The provincial law on energy saving measures in a building now requires minimum insulation levels depending on the building type, its function and location. Designers and builders are now required be law to properly insulate and to submit a compliance certificate when seeking contract documents approval for a construction permit. Existing buildings do not have to comply to this law.
While the purpose of insulation is to resist heat transfer, it must be uniform to be truly efficient. If this uniformity is not achieved, heat flow variations will cause stains on the walls and ceilings(dust). For example, in old buildings there are marks showing the underside laths over which the plaster has been applied. This is because gaps between the planks allow cold air to pass through, condensation then forms on the inside surface of the wall, dust gets caught by it and eventually stains the wall surface.
Cold penetration can also cause structural problems.
Catalin Ivan-Quebec Real Estate Broker