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Speaker 1: Spray foam insulation is commonly used to retrofit uninsulated homes,

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Speaker 1: but could it prevent you from selling your house? The

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Speaker 1: way the foone is installed and how much ventilation it

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Speaker 1: has could cause damage to roofing timber, especially in colder

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Speaker 1: climates like ours. A couple in the UK recently were

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Speaker 1: unable to sell after installing the insulation. They had problems

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Speaker 1: with the banks with the insurers who didn't like the foam.

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Speaker 1: In New Zealand, installers have to produce a statement saying

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Speaker 1: the work complies with the building Code, but the work

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Speaker 1: doesn't have to be inspected. Damien McGill is the Hothy

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Speaker 1: Healthy Home Cooperation direct journeys with me this morning. Hey Damien,

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Speaker 1: sure to Ryan?

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Speaker 2: How are you? Yeah? Good?

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Speaker 1: Thanks, thanks for coming on the show.

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Speaker 2: There's nothing wrong with the spray fome per say. It

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Speaker 2: has one of the best insulation ratings of any product

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Speaker 2: on the market. It can be a great product when

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Speaker 2: used correctly. The issue is how it's used and how

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Speaker 2: it's being.

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Speaker 1: Applied and how is it being used in New Zealand

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Speaker 1: is it Do you have any concerns about it about

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Speaker 1: the way it's regulated.

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Speaker 2: Well, so you just mentioned that for the regulatory context

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Speaker 2: is now that should you want in the building now

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Speaker 2: exempts under floor and roof insulation retrofits for a building consent.

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Speaker 2: But you need to retrofit insulation into a wall cavity

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Speaker 2: and that needs a building consent. The problem is that

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Speaker 2: when you add retrofit war insulation, it may affect moisture

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Speaker 2: transfer inside walls and change drying rates, which in turn

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Speaker 2: may cause moisture to accumulate in the walls and affect

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Speaker 2: the durability of timber framing and cladding. This is directly

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Speaker 2: from NBI's website. In my opinion that a statement applies

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Speaker 2: equally to roofs too, which is my comment in the

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Speaker 2: article about Newton's third law emotion. You know the house,

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Speaker 2: it is a whole system. So if you improve the insulation,

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Speaker 2: you must also improve the ventilation. When you improve the

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Speaker 2: insulation and ventilation, you should improve your tightness and look

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Speaker 2: out for thermal bridging. And by the time you add

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Speaker 2: some windows that you have the five passive house.

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Speaker 1: Principles right, So that standard currently covers walls, but not roofs. Roofs. Rather,

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Speaker 1: is that what you're saying.

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Speaker 2: There must have been a relaxation recently to exempt underfloor

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Speaker 2: and roof insulation from a building to sent so it

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Speaker 2: doesn't necessarily it doesn't just apply to spray frame. It

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Speaker 2: applies to all insallation additions. Give you a couple of examples. Recently,

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Speaker 2: I have upgraded my rental properties by adding an extra

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Speaker 2: one hundred and eighty milimeters of wall insulation in the ceilings.

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Speaker 2: But because of this I've also upgraded the ventilation too.

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Speaker 2: Otherwise I would I was concerned I'd have significant and

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Speaker 2: issues in the ceiling cavity. For what happens.

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Speaker 1: For your own For for our listeners, if you have

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Speaker 1: had this work done by a registered professional, should we

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Speaker 1: you know, we should have nothing to worry about. I

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Speaker 1: mean they should be looking at the ventilation. If they're

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Speaker 1: doing the insulation too right, they.

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Speaker 2: Won't be looking at the ventilation. They won't be. They

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Speaker 2: won't be. They won't be. So that's that's that's where

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Speaker 2: the issues. So in the UK, a couple of things

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Speaker 2: have been happening. One have been spraying directly to the

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Speaker 2: underside of concrete tiles, which I guess we have. You

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Speaker 2: know the state that the brick and tile fifties houses

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Speaker 2: are a similar type of construction, but if the roof

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Speaker 2: is leaky, then there's nowhere for that. So basically you're

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Speaker 2: going to fill up a gap underneath the tiles or

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Speaker 2: in the roof space probably seventy five one hundred mills

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Speaker 2: of phone and and you're going to seal that up

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Speaker 2: so any moisture gets in there, it's not able to

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Speaker 2: dry out.

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Speaker 1: Understand Yeah, yeah, yeah, I understand what you're saying, Damien,

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Speaker 1: and I'm I appreciate you you running us through exactly

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Speaker 1: how it works. Yeah, as you say, it's not it's

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Speaker 1: not foam, it's not. This is not a foam as

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Speaker 1: bad story, but it's a cautionary tail. I suppose if

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Speaker 1: you are insulating to think about ventilation as well. Damien,

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Speaker 1: really appreciate you coming on the program. Damien McGill, Healthy

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Speaker 1: Home Cooperation Director. For more from News Talks B listen

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Speaker 1: live on air or online, and keep our shows with

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Speaker 1: you wherever you go with our podcast on iHeartRadio