Warm Deck Pitched Roof Detail

The insulation is tapered to provide a fall to the roof to enable water to run to the water outlets.

Warm deck pitched roof detail.

Insulating a pitched roof above the rafters is the common method chosen for new builds and re roofing existing detached buildings as it provides superior thermal performance for the building. This usually keeps the deck warm. There are typically two different ways to insulate a roof a warm roof and a cold roof. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.

In a warm deck roof the insulation is positioned above the structural deck and no ventilation is required. The roof pitch is described by the vertical rise divided by horizontal span. No ventilation is required for these types. This enables the temperature of the structure and the deck to be kept close to the temperature of the inside of the building hence warm.

This part is well known as slope in geometry tangent function or stair construction in trigonometry. Warm deck roof a warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. Alternatively it can be positioned between the rafters or partially between and below the rafter. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building therefore the roof structure is protected from extremes of hot and cold lessening the potential for damage caused by thermal movement.

The position of the insulation can be wholly above or partially between and above the rafter. It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. Roof pitch is expressed as a ratio of the amount of the roof s vertical rise over a corresponding horizontal distance called the run pitch is written assuming a run of a foot or 12 inches so the ratio describes how much the roof rises for every foot of its run. A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging.

Warm roof deck sandwich roof warm roof systems benefit from the insulation sitting above the deck. In building construction roof pitch is a numerical measure of the steepness of a roof. Warm roofs have an insulation layer above the roof deck. In a warm pitched roof construction the thermal insulation is placed in the rafter line.

Making decision about roof pitch.