who has installed a whirlybird to their roof?

That is the first thing we look at from the street
Onc_Artisan

We had 1 whirly + 4 eve vents as standard in our house and we've added a 2nd as it's a large house. Getting Evening Haze as the roof colour.

Sucking hot air out of your roof space doesn't make your living room cooler. Sucking hot air out of your living room makes the house cooler.

hello

we we got a whirly bird with our roof, its supposed help the roof cool down i think

Choice had an article about them many years ago and I think that's pretty much what they said. Useful in specific circumstances such as if you have a raked ceiling and can have the whirlybird ventilating the room but otherwise their benefit is negligible.

Just in case anyone missed my comment about extracting water vapour from a roof space...
I suggested it was important if you have bathrooms
...that the extraction from the room should not be exited into the roof space ,
...but free-to-air outside the roof space.

I didn't mention anything about heatgain or loss ,
my primary goal was to reduce moisture ingress into the ceiling insulation
and thereby reducing the likelyhood of moldy bathrooms
as I said, this is with my waterproofing hat on 20+years as a sole trader
Onc_Artisan

Is that mouldy bathrooms or mouldy insulation?

Moisture also accumulates in the house because of cold surfaces. Good insulation reduces cold surfaces, which reduces condensation, which reduces moisture, which reduces mould.

Got a couple of Eco-vents that open only when roof space temp goes over 35 degs. Said to be much better than whirlies.

Chris

Dymo in my example the 2 are the same(at least, mouldy insulation will lead to a mouldy Bathroom), what you're talking about and what I recommended are 2 different things



I would too if we had a roof space larger that 140mm... the bathrooms will be ducted out
Onc_Artisan
PS I could just Moderate and say nothing, it would be easier