Roof Decking With Insulation

But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used.

Roof decking with insulation.

Rigid foam board is just above the roof deck or an exterior insulation option. The dew point is typically within the insulation layer lowering condensation risks. The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. Insulation above the roof deck or air vapor impermeable insulation below the roof deck is needed for condensation control in an unvented roof.

The later is used in new construction as the interior board serves as an inner wall. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Because the insulation is so close to the roof and you want to avoid unwanted moisture buildup these roofs will need to be completely sealed off. Hot roofs are insulated above the rafters.

Install baffles or make sure there s 1 minimum of airspace between the roof deck and insulation. It typically has 3 variations. Explore owens corning commercial roof and roof deck insulation products to help with your next building project. For standard steel deck construction this approach has many advantages such as.

Air sealing hot roofs is critical. For such constructions the principles and benefits of unvented attic construction are similar to that occurring in a single family residence. Insulation for condensation control. Ceiling insulation is then installed on the attic floor.