Roof Decking With Insulation

The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions.

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. Insulation above the roof deck or air vapor impermeable insulation below the roof deck is needed for condensation control in an unvented roof. 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. The dew point is typically within the insulation layer lowering condensation risks.

Vented attics have insulation installed underneath the roof deck in direct contact with the decking. It typically has 3 variations. The later is used in new construction as the interior board serves as an inner wall. Install baffles or make sure there s 1 minimum of airspace between the roof deck and insulation.

Ceiling insulation is then installed on the attic floor. Insulation for condensation control. Explore owens corning commercial roof and roof deck insulation products to help with your next building project. Walls foundations roof and roof decks air distribution ceilings interior solutions mechanical pipe equipment appliances commercial insulation home page.

For such constructions the principles and benefits of unvented attic construction are similar to that occurring in a single family residence. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. For standard steel deck construction this approach has many advantages such as. Air sealing hot roofs is critical.