Warm Deck Pitched Roof Construction

A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging.

Warm deck pitched roof construction.

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. 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. This usually keeps the deck warm. First determine which climate zone your project is located in 1 thru 16.

It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. Alternatively it can be positioned between the rafters or partially between and below the rafter. Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building. The title 24 prescriptive requirements divide roofs into two categories low slope less than 2 12 pitch and steep slope greater than 2 12 pitch.

To solve this problem you can either replace your original deck footings to support your new roof or build your roof separate from your deck to ensure a proper foundation. 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. In a warm pitched roof construction the thermal insulation is placed in the rafter line. This usually keeps the deck warm.

While a typical deck is designed to support 55 pounds per square foot psf a roof requires 80 psf of support. Check with your town. There are typically two different ways to insulate a roof a warm roof and a cold roof. There is no need for additional ventilation.

Warm roofs have an insulation layer above the roof deck. On flat roofs a warm roof is one in which the insulation layer is laid on top of roof structure. Next determine your roof slope. This results in the structural deck and its supports being at a temperature closer to that of the building s interior.

The cool roof requirements vary depending on the climate zone. Roof pitch is a measurement of a roof s slope expressed as a ratio. Where the insulation is placed above the structural deck warm deck and either above or below the waterproofing. Inclined along the line of rafters warm roof or positioned within the roof structure to form an insulated void room in roof which can result in warm and cold roof areas.

The position of the insulation can be wholly above or partially between and above the rafter.