The insulation of the roof is very important!

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When I was a child, in the winter, my mother always said to me: “Wear a hat! It is by the head that you lose all your warmth! I hate hats, but my mother was right: it is indeed from above that warm air escapes, not only from the body, but also from the house.
Without adequate insulation, your home may lose much of its heat, including 11% of the roof. If it is flat and you can not access it from the inside, the addition of an insulating coating should be done by an entrepreneur. On the other hand, if your attic is easy to access, you can do the work yourself.

Check your insulation

If you have access to your roof, some signs (mold or discoloration of the existing insulation) may confirm a problem and indicate where hot air escapes. By checking your attic when the winter temperature is extremely cold outside, you will be able to see or not the presence of frost. If necessary, a good amount of frost will confirm a ventilation problem.

Insulation in roll or mat or bulk insulation?

If your attic is uniform and there are not too many obstructions over the joints, insulation with roll or mat or mat insulation is ideal. If there are several obstructions, you will need to use bulk insulation to finish covering the surface and fill the spaces. Remember that it is better to have a layer of insulation over the joints and all around the obstructions. If the space is very irregular, it will be simpler to use only bulk insulation. No matter what you use, check the thermal resistance value of the product and use the thickness required to achieve the R40 coefficient.
The mat (or mat) insulation has the appearance of a roll of wadded wool and is sold in widths of 16 or 24 inches. After measuring the space between your joints, cut a piece of insulation of adequate size in the roll; If this is not possible (the piece can not cover everything), cut a complementary piece in another roll, or use bulk insulation. Place your pieces between the joints and fill any remaining space with bits of mat insulation.
A second insulating layer may be installed at an angle to the first; It is also possible to use mat insulation (or mattress insulation). The important thing is not to interfere with the ventilation of the roof. Also, allow a minimum clearance between 1.5 inches and 2 inches between the top of the insulation and the underside of the roof.
If the bulk insulation can be transvided by hand, it is imperative to ensure a uniform thickness across the attic to obtain the correct thermal resistance value.
Isolating an attic is a demanding operation and is an investment for your home. Whether you do it yourself or not, you can get help and even financial support through the EnerGuide for Houses program. If you are uncertain about the need for better insulation, a certified technician can go to your home and conduct a thorough and professional audit. Visit the Energy Efficiency Agency website for more information.