New Roof Insulation Regulations

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.

New roof insulation regulations. Cold deck the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. 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. Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects. New insulation in rental properties needs to meet minimum r values.

How to meet the current insulation regulations. Work to an existing roof. Insulation is measured by r value. 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.

Movement could cause cracks to occur in the walls and possibly the eventual collapse of. Your roof type flat or pitched its structure depth of the rafters your willingness to invest. Chimney flues roofing etc. R values are a measure of resistance to heat flow.

New zealand standard nzs 4246. The removal or alteration to any roof elements could affect how the roof works and cause movement to occur. In most cases extra investment made in beating the building regulations on insulation is money well spent it gives a lot back in returns. These are expressed as a u value which needs to be achieved.