Unvented Flat Roof

Systems where condensing surface temperatures are controlled and systems where condensing surface temperatures are not controlled.

Unvented flat roof.

When properly installed unvented roofs perform well and cause no excess moisture accumulation. Drying of unvented roofing assemblies is by definition only provided to the interior. These roofs can lower your heating costs in the winter. 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.

Unvented roof design falls into two categories. This document provides a brief description of different types of unvented roof assemblies and the benefits of unvented roof construction. In unvented flat or low slope roofs with parapets perform a full flood test to ensure leak free installation of roofing membrane. If water or air ducts run through your attic space they are less likely to be affected by extreme temperatures and this can save you money on utility costs.

Low slope and steep slope unvented roof systems i e. Martin s post focuses on the marketing of owens corning 039 s propink unvented attic insulation system. If you don t want to use sips or nailbase there are four basic approaches. Four options for building an unvented roof assembly.

Yes unvented roof assemblies can be insulated with fiberglass a wufi post and not just in climate zones 2b amp. These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. In order for an un vented roof assembly to function properly the following conditions must be in place. Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction.

Unvented flat roofs a technical discussion flat roofs have often been built with the insulation all on top of the vapor closed drainage plane as this avoids dew point condensation issues inboard of the roofing.