Also whirlybirds are less effective if you have no sarking under the roof.
Tiled roof whirlybird.
If you re a qualified tradesperson you may like to follow these for whirly bird vent installation also.
If you have a tiled roof the eave vents would be superfluous wouldn t they.
Unlike metal roofs there isn t as much need for eave vents.
The tile roof turbine s exclusive vari pitch base adjusts to a 12 12 roof pitch.
This is where the hot air is trapped and installing the whirlybird here allows the hot air to escape and in turn lets the ceiling void to cool down.
The difference between your 2 whirlybirds could be anything that affects those conditions.
Otherwise the whirly bird will just draw air through the gaps in the roof tiles locally and not produce much cross ventilation.
Vertically whirlybirds are best situated close to the apex of the roof to capture and expel the maximum volume of rising hot air.
4 they don t work when there is no wind.
They are also available for download.
A whirlybird will work better on a tiled roof as you create a small cross flow.
One side of your roof is shaded towards the south so doesn t get as hot where the whirlybird is or your roof is a lighter colour than your neighbours so the heat build up is slower etc.
Cost to install roof vent ridge install a whirlybird on tile roof lomanco vents tile turbine does roof ventilation work tile roof repairs and whirly bird installing roof vents 1 use white enamal paint on thehow to install a read more.
I ve just had a couple of quotes to get my concrete tile roof repainted and both roof guys said the whirlybird s are next to useless with a tiled roof because of the amount of natural ventilation through the thousands of gaps you have between the tiles.
At this point you ll need to climb into your roof space so that you can mark your exact installation points on the underside of the roof sheets or tiles.
The whirlybird tile roof turbine s large flashing makes installation easy.
A closed attic space is needed to force the whirly bird to draw air through the vents.