New Roof Insulation Regulations

The minimum r value depends on which part of the country the property is in.

New roof insulation regulations.

Insulation is measured by r value. 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 roof covering is then laid over the ply.

Your roof type flat or pitched its structure depth of the rafters your willingness to invest. 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. Movement could cause cracks to occur in the walls and possibly the eventual collapse of. 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.

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

Chimney flues roofing etc. R values are a measure of resistance to heat flow. Work to an existing roof. New zealand standard nzs 4246.