Non Vented Roof Insulation

Removing moisture from roof cavities structural members sheathing and insulation.

Non vented roof insulation.

If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Unvented roofs vented roof. Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing. Minimum 1 4 in.

Suggestions for un vented or hard to vent building roof cavities. Unvented roofs which provides a detailed explanation of each. There are traditionally four main reasons for venting a roof. How to avoid condensation leaks attic mold insulation mold structural damage to roof framing when roof venting is not possible cathedral roof and knee wall insulation venting air path options in older homes hot roof designs.

Control airflow install at least 1 in. If wood shingles or shakes are used a layer of drainage mat e g. In this case you can learn a lot from foam tech s article vented vs. Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation.

Worries about the hot roof un vented cathedral ceiling designs how to. Or 6 mm vented airspace should be installed between the roofing and the underlayment. Unvented roof systems where the insulation and air barrier are applied directly to the underside of the roof deck are common in applications where designers are seeking cost effective and energy efficient roof assemblies. However designers of compact roof assemblies must consider vapor permeance and arrangement of the roofing materials to produce acceptable hygrothermal performance and low.