Insulation Below Roof Deck

With rising heating and cooling.

Insulation below roof deck.

Insulation above the roof deck or air vapor impermeable insulation below the roof deck is needed for condensation control in an unvented roof. Hence the term cold decks construction materials wood based products absorb moisture. This section outlines the conditions for unvented attic roof assemblies. This variation on the unvented attic design requires a thermal barrier such as an approved intumescent coating.

The project is in climate zone 4 seattle area and i want to have an open beam look in the ceiling. I m considering a roof design that would place all the insulation above the roof deck with no insulation below. The greater your home s thermal resistance factor or r value the more energy efficient it is. How to attach rigid insulation on the underside of the roof deck.

The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. 07 22 00 roof and deck insulation. The roof deck is cold wood decks without insulation above them will readily equilibrate to the exterior temperature. Placing a layer of fluffy insulation below the roof deck would needlessly complicate the.

Below you will find links to company and product information for manufacturers and suppliers listed in the roof and deck insulation section of sweets. I would use polyiso with a top layer of eps as recommended in your blog post on the topic.