The later is used in new construction as the interior board serves as an inner wall.
Roof decking with insulation.
Ceiling insulation is then installed on the attic floor.
For standard steel deck construction this approach has many advantages such as.
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Insulation for condensation control.
For such constructions the principles and benefits of unvented attic construction are similar to that occurring in a single family residence.
It typically has 3 variations.
For most of us in the low slope roofing industry it s considered to be absolutely standard to have insulation placed above the roof deck.
Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.
The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions.
Install baffles or make sure there s 1 minimum of airspace between the roof deck and insulation.
Air sealing hot roofs is critical.
Insulation above the roof deck or air vapor impermeable insulation below the roof deck is needed for condensation control in an unvented roof.
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Vented attics have insulation installed underneath the roof deck in direct contact with the decking.
The dew point is typically within the insulation layer lowering condensation risks.
Hot roofs are insulated above the rafters.