Flat-Roof Insulation

The insulation of a flat roof depends on the system and the building requirements. These systems include the ventilated flat roof and the thermal roof. In the second case, insulation is critical, because, unlike the first system, the flat roof is not ventilated. Before performing insulation work, we must analyze the needs of your building and determine the solution best adapted to the existing system. In this way, the work will maximize the durability of the covering and protect the integrity of the building over the long term. Without this, problems associated with inadequate insulation could arise in the short to medium term. It is therefore important to entrust the insulation work to specialist roofers to ensure the quality of the work and protect your investment


Two Separate Roof Insulation Systems

The ventilated flat roof has an attic with enough space for ventilation. The flat roof is therefore ventilated and so the insulation should support that system. In general, this type of system requires fans located in strategic places, vents, and insulation with a high R-value. For more information on the R-value, refer to the fact sheet or speak to a technical consultant.

The thermal roof does not include such an attic ventilation system. Insulation plays an important role in the overall performance of the roofing system. In this case, it is necessary to insulate from above using rigid panels placed directly on the vapour barrier. Since various products are available, with different properties, it is best to speak with our technical consultants who will be able to recommend the right choice in light of the compression tolerance and the R-value appropriate for your building. The most common products on the market are:

  • Fiberglass insulation.
  • Foamed polystyrene.
  • Polyisocyanurate.

Roof Insulation Work

Our roofers master all roofing systems and sealing solutions for flat-roof residential and commercial roofs. Their expansive knowledge allows them to make the appropriate choices for your building in addition to optimizing the insulation. For an efficient roof insulation, there must be a gap of at least 75 mm (3 1/2 inches) between the flat roof and the new insulation to allow air to circulate. If there is not enough space in the attic, our roofing specialists can raise the structure to create the play required for air circulation. If necessary, they can also install a vapour barrier and insulation to maximize the effectiveness of the entire system.

If you notice an accumulation of ice on your roof, mould, stains on interior walls, paint peeling away, an uncomfortable and unstable temperature inside the building, or an elevated cost of heating and air conditioning, please entrust the roof insulation work to experts. Les Couvreurs Duro-Toit hold certifications that attest to the quality of their flat-roof insulation, including those from manufacturers and CAA Habitation. After our intercession, you can rest assured that all of the pieces are in place to protect you investment over the long term.

Frequently Asked Questions