New Roof Insulation Regulations

Insulation is measured by r value.

New roof insulation regulations.

Insulating a roof is perhaps the easiest of all the energy saving home improvements. In most cases extra investment made in beating the building regulations on insulation is money well spent it gives a lot back in returns. The roof covering is then laid over the ply. R values are a measure of resistance to heat flow.

New insulation in rental properties needs to meet minimum r values. Chimney flues roofing etc. Movement could cause cracks to occur in the walls and possibly the eventual collapse of. Work to an existing roof.

Cold deck the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. 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. These are expressed as a u value which needs to be achieved. The removal or alteration to any roof elements could affect how the roof works and cause movement to occur.

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. How to meet the current insulation regulations. New zealand standard nzs 4246. The minimum r value depends on which part of the country the property is in.