Insulating The Roof Deck

For the same reason insulation shouldn t touch the roof s underside.

Insulating the roof deck.

Insulating the roof is a priority if the ceilings of your home happen to be part of the roof deck as is the case with cathedral ceilings. However it is the most labour intensive and most expensive option. When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air. This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4.

Materials commonly used for the insulation of the roof deck include. Add insulation above the roof deck this approach fits current building science thinking in terms of putting the thermal control layer on the outside of the building structure. Rigid foam insulation boards. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. When installing a foil faced foam board insulation. You may also insulate your roof to help regulate the temperature in an attic that is a part of your living space. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the.

Generally more insulation is needed for condensation control in colder climates. There are different roof decks that require different insulation techniques. Typically this would be achieved by adding polyiso insulation above the plywood deck. Cold roofshave insulation between the rafters allowing for ventilation space below your roof deck.

Hot roofsare insulated above the rafters. Also the higher the indoor humidity the more insulation is needed to avoid condensation. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions.