Warm Roof Construction Ventilation

Ventilation is required for these roofs.

Warm roof construction ventilation.

Although there is a low risk of condensation with warm roof construction it is very difficult to seal all joints gaps and penetrations against all water vapour transmission. Approved document c2 requires that roofs be designed and constructed so that their structural and thermal performance are not adversely affected by interstitial condensation. Inclined along the line of rafters warm roof or positioned within the roof. A properly insulated ventilated roof can help to control or prevent the formation of ice dams.

There are two types of flat roof. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. Cold roofs and warm roofs. Ventilated roofs remove moisture from roof cavities structural members sheathing and insulation.

The need for roof space ventilation is eliminated or reduced. Understanding the roof construction of any new build or refurbishment is essential to determine what products are required for the job. These roofs keep your home cooler during the hot summer months. Where the insulation is placed above the structural deck warm deck and either above or below the waterproofing.

With the potential of additional living space a cathedral roof design or a conditioned roof void are rapidly becoming the preferred choice of pitched roof construction in the uk. Eliminating traditional ventilation and the potential condensation risk associated with large voids of cool air make this the optimum pitched roof solution. A cold roof design is generally not recommended for new build roof applications due to the added requirement for roof void ventilation and the difficulties in preventing cold bridging through the system. There is no need for additional ventilation.

In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Ventilation building regulations. Because the sheathing is kept cooler roofing materials tend to have a longer life span. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

The advantages of warm roof construction. Thermal bridging is largely eliminated as the insulation is continuous over the whole roof structure. In pitched roof construction thermal insulation can be placed horizontally at ceiling level cold roof. A cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.

Figure 2 warm roof construction. The ceiling space is on the warm side of the insulation. Like a cold roof warm roof ventilation is required at high and low level to remove moisture laden air from the batten cavity and comply with approved document c and the. In a warm roof construction the principal insulation.