Vented Insulated Roof Sheathing

Enhancing roofing material life span by reducing sheathing temperature.

Vented insulated roof sheathing.

There are traditionally four main reasons for venting a roof. So i ll start by saying something that might sound controversial but really isn t. Removing moisture from roof cavities structural members sheathing and insulation. 7 16 apa teco rated osb or min.

The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Consisting of acfoam ii or acfoam iii polyisocyanurate polyiso insulation board and a min. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. 19 32 cdx plywood separated with and bonded to 5 individual 1 0 1 5 or 2 0 vent spacer strips acfoam crossvent is offered in a variety of composite thicknesses.

So much information has been devoted to the subject of roof venting that it s easy to become confused and to lose focus. Thermally efficient cross ventilated non structural composite insulation. Hunter cool vent cool vent is a venting composite insulation board that consists of a 4 x8 panel of rigid polyiso a middle layer of solid wood spacers creating a standard 1 air space and a top layer of apa teco rated osb or plywood. Unvented roofs vented roof.

There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing. There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing. The ventilated roof insulation should be a factory assembled panel consisting of one layer of 7 16 11 1 mm oriented strand board top surface a built in ventilation space maintained by 1 25 4 mm wood spacer blocks and polyisocyanurate insulation on the bottom. For the same reason insulation shouldn t touch the roof s underside.

Hunter panels the innovator of polyiso insulation products an interesting thing happened 22 years ago when hunter set out to manufacture the absolute most effective efficient and innovative polyiso insulation panels available anywhere we also created the finest customer service organization and builder support team in the industry. Open or closed cell spray foam is applied to the underside of the roof sheathing and additional fiberglass or cellulose insulation is blown in as a cost saving method for meeting high insulation requirements and filling in the cavity space between the rafters to the ceiling deck. Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. Ventilated roof insulation a.

Controlling ice damming by keeping the roof cold.