Cold Deck Roof Ventilation

A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space.

Cold deck roof ventilation.

No insulation is on top. Ventilation is required to the underside of the deck. So i went with the idea of having a cold roof. There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation.

Here is a few pictures. Ventilation is required for these roofs. 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. When thermal insulation is placed below the deck the ventilation must.

There are three main types of flat roof construction namely cold deck warm deck and inverted warm deck the only one of which requires ventilation being the cold deck see figures 6 and 7. I m told it will require 3 days of work by builders to construct vents and i am expecting to be asked to pay for this additional work as it will be classed as a building control issue. The joists run adjacent with the house. Building control recently refused to ok the new roof as it was now a cold roof and therefore required ventilation.

Guidance advice on warm cold. Ventilation is not needed in a warm roof. Figure 6 flat roof cold deck. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

At the front side we have the house multiple stories so we can t put a vent. Plus it wasn t a livable roof so it was done on the cheap i guess. You only need ventilation in a cold roof. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1 10.

What is flat roof ventilation. In this way the roof itself is kept cold. When placed below the structural deck. The minimum requirements for cold roof ventilation are set out in bs 5250 control of condensation in buildings which takes into consideration span pitch and roof area.

Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings. A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. My problem is that i simply cannot have ventilation.