Flat Roof Assembly

Sc historically typical construction of homes in canada and the us have vented attics between the ceiling of the interior space and the roof.

Flat roof assembly.

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. Condensing surface temperature controlled the thickness of the rigid insulation at both the roof deck and perimeter is determined by a calculation procedure similar to figure 5. An unvented roof assembly is constructed without any ventilation and is fully sealed on all sides and filled with insulation. A flat roof s design is both efficient and economical.

The higher the interior moisture level the thicker the. In unvented flat or low slope roofs with parapets perform a full flood test to ensure leak free installation of roofing membrane. The components of a conventional flat roof assembly varies very little from roof to roof. The colder the climate the thicker the rigid insulation required.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. The roof felt asphalt tar layering is repeated in overlapping layers until the assembly is two to fours plies in thickness. To calculate the total r value of a roof assembly find the total thickness in inches of each type of insulating material within the system. Before constructing a flat roof assembly please refer to the unvented roof assembly comments under 6 2 vented and unvented roof assemblies and if applicable 6 3 parapet walls.

However designers of compact roof assemblies must consider vapor permeance and arrangement of the roofing materials to produce acceptable hygrothermal performance and low. Roof assemblies must control for exterior moisture in a monolithic and complete fashion. Conventional flat roof assembly. A wear surface of finely crushed stone granules is usually applied to the top layer of hot tar to protect the built up roof assembly from uv light and weather.

Add the results for all the materials together to get the total r value for the roof assembly. Unvented flat roof assembly. The main components typically remain constant while the only component that will vary is the roof membranes manufacturers roof system which is the waterproofing barrier or top layer of the roof assembly. Test roofing membranes for integrity prior to covering from below.

Flat roofs are nothing new nor are some of the proven materials that cover these often expansive roofs such as those found on factories warehouses big and small box stores apartment buildings large public structures and schools universities.