Roof System

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Roof System

Poorly insulated and poorly ventilated roofs can cause problems. For example, a problem could be the formation of ice barriers on hanging hoods on cold days, which can cause melted water to penetrate the roof material on the top of the roof. Ice walls are formed when heat escapes through the upper part of the roof, and the snow melts into these places, dripping into shingles and accumulating in the form of ice in the lower parts. 

For this reason, most buildings have a system to protect the walls of the building from roof water. Most modern roofs (as well as many old roofs) have valley systems, drains, cusphers, water heads, and downpipes to remove water from the building.


Vapour Barrier

In a cold climate, fumes often occur in the interior through overlapping steel decks, then condense in the roof insulation to saturate the insulation, and flow through the deck joints as free water. In a cold climate, it is always best to install a fully sealed vapour barrier under the roof insulation on the steel ceiling. Make sure the construction engineer has designed the deck for elevator loads, especially outside and in corners. 

Do not use household items as a vapour barrier because it has insufficient steam resistance. The presence of a vapour retarder can make it difficult to locate leaks; they can carry water over long distances from the source of the leak. However, vapour barrier brakes must be used on all new concrete decks and steel decks with high humidity, especially in cold climates. If the deck is a new concrete deck, you can attach a vapour barrier to the top of the deck to prevent the ingress of moisture, which is an integral part of the new concrete deck and the roof system.

Air Barrier

To reduce the possibility of pumping indoor air into the roof system, an air barrier at roof level should be installed under the roof insulation that seals all the empty spaces. Specify an air barrier on board, in combination with a steam retarder in a cold climate with high humidity interiors or with membranes on new concrete decks, in order to prevent wind pumping. To avoid tearing in the event of a diaphragm rupture, it is recommended to use only reinforced membranes for this method of attachment. 1 Due to mechanical stresses that focus on the edges of the film and air pumping that draws indoor air into the roof assembly causing condensation problems, mechanically attached membranes are usually not considered the best choice.

Monolithic Roof

If the roof membrane is monolithic (i.e. membrane roof), it serves as an air retarder. When an air barrier other than the roofing membrane is installed in the roofing system, it is usually attached to solve wind energy problems or to meet the requirements of a specific building code.

Cold Roof

A cold roof is a roof with a surface and shingles that have a temperature similar to outdoor air. The ventilation and insulation system means that the heat is not emitted by the roof. In New York State, and in all areas where it is cold, a cold roof is a must.

Brandxxx offers a versatile, easy-to-install roof system that can be used on most substrates, including metal, concrete, and wooden decks. It is suitable for new and renovated roofs; it can be used in various forms and with a waterproofing membrane for areas with low traffic. However, it can be used for areas with high traffic, and you can choose a wearing layer or a designed surface such as a green roof.


  • According to research, green roofs help reduce sulfur dioxide by 37%. 
  • According to UKQBC, 44% of total CO2 emissions from buildings are released. 
  • Single-layer ETFE membranes and ETFE cushions weigh about 1% of the glass, meaning they are extremely light. 
  • A recent study of residential buildings in northeastern Germany with flat roofs suggests that winter fuel costs will be reduced by 3% to 10%. 
  • The growth substrate and plants in the green roof system changed the heat flow and reduced the average daily energy demand to less than 5 100 BTU (2 kWh), which is a reduction of over 75%. 
  • Environmental studies in Canada have shown that the top floor of a building with a green roof can save 20% of the energy demand.