Cold Deck Roof Insulation

The second and nearly as important goal is to keep the roof deck as cold as possible during upstate new york winter months.

Cold deck roof insulation.

Ratio of r value between rigid insulation and batt insulation is climate dependent. It can also be used as a roofing cover board and in building envelope applications. Ventilation is required for these roofs. Polyisocyanurate thermal insulation also referred to as polyiso pir or iso is a popular low slope commercial building roof insulation.

Rigid insulation used to control condensing surface temperatures rigid insulation installed above roof deck. Guidance advice on. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. In cold and very cold climates selecting a roof deck condensing surface temperature criteria of 45 f is very conservative.

Cold roof sheathing is one of many components in keeping ice dams at bay. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. To create a cold roof we provide each rafter bay with a full width vent chute that leaves a 1 1 2 inch air channel under the roof deck. Zones 5 6 7 and 8 in that the manufacturers of these materials assume that roof deck may require ventilation to assist drying.

This construction relies on a vapour control layer working effectively and in tandem with a continuous ventilated airspace to disperse the water vapour to atmosphere before it reaches the cold deck and condenses. Care should be taken with these assemblies particularly in cold climate zone locations i e. The roof deck is cold wood decks without insulation above them will readily equilibrate to the exterior temperature. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.

It is a thermoset closed cell foam that is an optimal insulation solution for low slope roofs. Hence the term cold decks construction materials wood based products absorb moisture. The breakdown warm roof vs cold roof. A cold roof has the insulation placed below the structural deck which thus remains cold.

Where insulation depth is restricted by the flat roof construction it may be necessary to install the roof insulation between and below the joists to create a cold deck structure. During cooler night times and in winter periods the deck temperature can then be below the dew point of the interior air.