Cluster Flies In Boarded Out Garage Roof

[jackg 7]

Went to a property to do a wasps nest and she asked me about cluster flies in her converted garage.

The upstairs room is a living area with sofa, TV. She said it was used as a holiday let.

The cluster flies gather in the Velux windows in the roof.

The roof is boarded out with plasterboard and there are GL10 downlighters in the ceiling.

So how do you control cluster flies in this room?

 

Smoke bomb is an option as she would cover up or remove the furniture but the flies hibernate behind the plasterboard so the smoke would not get to them and there is a potential fire risk if smoke gets behind the plasterboard where the flies are.

There will be insulation between the rafters.

 

Diatomaceous Earth in the Velux somewhere?

Fly papers.

EFK?

 

[trappa 518]

And you cant use ULV? its too early to treat anyway, if you treat now there will only be more coming.

[Rebel 833]

I get a load of them in my attic each year are they any harm?

 

Is there any over the counter product I could use.

 

Do they just keep coming back each year anyway?

 

Thanks.

[trappa 518]

Fogging i mean.

[Ratmanwan 66]

If there in the velux they may not be in the roof void. I would wipe an oil based product around the inside of the frame with a cloth.

[jackg 7]

And you cant use ULV? its too early to treat anyway, if you treat now there will only be more coming.

 

Should have said, going to return in winter to do something. Not now.

Edited October 21, 2017 by jackg

[ChrisJones 7,975]

Went to a property to do a wasps nest and she asked me about cluster flies in her converted garage.

The upstairs room is a living area with sofa, TV. She said it was used as a holiday let.

The cluster flies gather in the Velux windows in the roof.

The roof is boarded out with plasterboard and there are GL10 downlighters in the ceiling.

So how do you control cluster flies in this room?

 

Smoke bomb is an option as she would cover up or remove the furniture but the flies hibernate behind the plasterboard so the smoke would not get to them and there is a potential fire risk if smoke gets behind the plasterboard where the flies are.

There will be insulation between the rafters.

 

Diatomaceous Earth in the Velux somewhere?

Fly papers.

EFK?

Is there an access point to the roof void?

[jackg 7]

 

Is there an access point to the roof void?

 

There is no void as the plasterboard is screwed to the rafters.

Edited October 22, 2017 by jackg

[goshawking719 492]

Pop the down lights out and ulv.

[ChrisJones 7,975]

There is no void as the plasterboard is screwed to the rafters.

 

Gotcha. That's going to make it very tricky!

 

Pop the down lights out and ulv.

 

Might only get part of the job done that way by the sounds of it.

[goshawking719 492]

Working in fairly rural areas I do a lot of jobs like this, barn convertions etc. It always surprises me how far ulv can reach and how much off a difference cracking a window or opening a door to create some air flow can make to job.never had to resort to anything for cluster flies, bar residual insecticide around velux Windows.

[PLEDGEY 496]

This might not work in the situation you describe but it is good for attics that have thousands of cluster flies gaining access to hibernate, especially in old buildings where it's hard to fill all the small holes that allow cluster flies to get down in to bed rooms etc. You can get Auto aerosol sprayers. They are like those timed sent sprayers you get in pub toilets and run off of 2 'D' Batteries. Did a cluster job in a house in Frome. Woman was complaining that she was getting them in and around the bedroom windows. One bedroom in particular was full of them. This room had a loft hatch. Went in loft and there were thousands of flies . They were getting in around the loft hatch. You could see light coming up into the attic when in the attic. Sealed it with some padded draft strip (got from builders merchants), set off 3 smoke bombs in baked bean tins, then set her up with 2 auto sprayers. Kept them up there for 2 months before removing them. You used to be able to get them from KillGerm but I was told they don't sell them any more but I know they exist and do work. Smoke bombs are good for initial knock down but other flies soon find their way in.

[PLEDGEY 496]

Just found these. They're calling them

Roof Void Automatic Cluster Fly Control

but it's still the same thing. https://www.pestcontroldirect.co.uk/swak-pack.html