New Roof Insulation Regulations

How to meet the current insulation regulations.

New roof insulation regulations.

The minimum r value depends on which part of the country the property is in. New zealand standard nzs 4246. Your roof type flat or pitched its structure depth of the rafters your willingness to invest. Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.

Insulation is measured by r value. These are expressed as a u value which needs to be achieved. A ventilation gap usually 50mm should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across. Chimney flues roofing etc.

R values are a measure of resistance to heat flow. The roof covering is then laid over the ply. New insulation in rental properties needs to meet minimum r values. Cold deck the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification.

As a roof is defined as a thermal element the work to re cover a roof should also include for improving the thermal insulation properties of the roof. The removal or alteration to any roof elements could affect how the roof works and cause movement to occur. You are replacing repairing more than 25 per cent of the roof area in which case the roof thermal insulation would normally have to be improved. Insulating a roof is perhaps the easiest of all the energy saving home improvements.