Cold Roof vs Warm Roof: What's the Difference?
If you're considering purchasing trusses, you've probably also considered how you'll insulate them. In this blog we'll go through the difference between a cold and warm roof, along with the advantages and disadvantages of both.
Cold Roof
A cold roof is called as such because the insulation is placed at ceiling level, insulating the room below but leaving the roof space uninsulated and cold. If you've got standard (or fink) trusses, this is the type of insulation you'll probably use.
Advantages
Cost: Less insulation is needed overall, so costs are reduced
Ventilation: Cold roofs typically rely on ventilation to prevent moisture buildup. Air flows through vents in the eaves and exits at the ridge, keeping the roof space cooler and drier.
Disadvantages
Decreased efficiency: Less insulation also means less efficient, unfortunately. Cold roofs don't retain heat in the attic, potentially increasing heating costs.
Warm Roof
A warm roof is one that places the insulation between the rafters, insulating the attic space below and resulting in a warmer roof structure overall.
Advantages
Increased efficiency: Although the simple definition says the insulation is placed above the attic space, it can also be placed on the floor and in other void areas, resulting in a multi-layered approach that offers greater efficiency and reduces cold spots.
Disadvantages
Cost: The initial cost for the insulation will be higher, however, you will make this back eventually in the savings from heating costs.
Moisture management: If not properly designed, warm roofs can lead to condensation issues if there’s insufficient airflow or if moisture is trapped within the insulation. Choose a reputable and experienced tradesperson to install your insulation to avoid this.