Warm Roof Insulation Requirements

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Insulation Education Attic Renovation Attic Rooms Attic Remodel

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Insulation material is placed on top of the roof rather than in between the ceiling and the decking.

Warm roof insulation requirements.

Our u value calculator is free and simple to use for calculating u values specific to your roof construction design. There are two basic categories of roof design. The rigid insulation structure provides a complete waterproof barrier and means that the rising warm air can t escape. No ventilation is required for these types of roofs.

With a warm roof the usual process is to split the insulation into two layers. The roof insulation thickness will vary dependent on the required u value. The insulation boards are placed in the space between the rafters in the loft and act as a protective layer against the cold outside whilst keeping the warm air inside. Installing a warm roof can be extremely straight forward and simple to do.

Insulation is placed in between the joists underneath the roof surface above. You should leave the space under the roof tiles free from insulation to give adequate ventilation so that you don t get condensation or water coming through the tiles. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. Warm roofs offer a superior thermal performance and therefore come with a higher cost.

If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. There are two ways to insulate a roof. Both these variants require different approaches to insulation which will be covered in this guide. A thermal layer of fibreglass polystyrene or other insulating material should be inserted either above the roof decking the warm roof model which is suitable for homes or permanent residences.

Warm loft insulation is used on pitched roofs where you are using the loft space as a room or for storage. Or else on the interior of the building just. The insulation is installed under the roof in the slope. The waterproof layer is above the insulation and a vapour control layer is placed below the insulation.

The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters. With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters. Column a is for extensions where the existing dwelling s walls and roof u values are worse than 0 70 w m k in the walls and worse than 0 25 w m k in the ceiling. Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface.

Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation.

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