Insulating The Roof Deck

Rigid foam insulation boards.

Insulating the roof deck.

Install baffles or make sure there s 1 minimum of airspace between the roof deck and insulation. For the same reason insulation shouldn t touch the roof s underside. The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. You may also insulate your roof to help regulate the temperature in an attic that is a part of your living space.

However it is the most labour intensive and most expensive option. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the. Hot roofsare insulated above the rafters. 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. Insulating the floor and the roof this is certainly the most interesting solution when the attic is also going to be used. Materials commonly used for the insulation of the roof deck include.

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. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Also the higher the indoor humidity the more insulation is needed to avoid condensation. Generally more insulation is needed for condensation control in colder climates.

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. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. 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. When installing a foil faced foam board insulation.