Oriphix:graemeh:Oriphix: Its only me and wife we have a 3 bedroom house so we have already started on the master bedroom took out all the wall paper (that was a annoying job). So now that I have the windows decided before that I wanted to insulate the walls. But I don't know if you need a permit for it like my post above?
Unfortunately you do require building consent for insulation of outside walls.
Installing thermal insulation in an existing buildingExemption (jg) of Schedule 1
A building consent is not required for the following building work:
GuidanceThis exemption does not cover installation of thermal insulation in an external wall of a building, this may have weathertightness implications. Installing insulation in internal walls that provide fire separation is also not covered, as the installation could adversely affect the fire safety properties of the building.
- (jg) the installation of thermal insulation in an existing building other than in-
- (i) an external wall of the building; or
- (ii) an internal wall of the building that is a fire separation wall (also known as a firewall).
Examples where this exemption could applyExamples where the work is not exempt and a building consent is requiredA house is being retrofitted with polystyrene insulation under the floor and fibreglass insulation to the ceiling.The external walls of a house are to be injected with expanding insulating foam.An existing apartment building is being retrofitted with fibreglass insulation to the internal, non-fire-rated walls for additional noise control.A fire-rated tenancy wall to an apartment is to be retrofitted with thermal insulation.
Info from: http://www.dbh.govt.nz/bc-no-consent-schedule-1#installing-thermal
This is where I get really confused. I don't want to insulate the external wall. But I want to insulate the internal wall that is external facing. Is that what they mean by the external wall?
Yes, it means an outside wall as opposed to an internal wall (eg a corridor wall). Funnily enough, I insulated some walls of my house last year by taking the weatherboards off, insulating and putting on ply and a rainscreen and reinstating the weatherboards. When I rang the council they had a conflab and came back to say I didn't need a permit so it's all with the gods. The reason external walls are singled out is because of weathertightness issues and, to a lesser extent, iinternal moisture.
With the brick veneer house above it's important to retain an air gap by the wall so that the brick, which can absorb a lot of water, is able to dry and not transfer the moisture through.