Extractor Fan through Flat Felted Roof

[nzwy1p]

Hi,

I need to vent a kitchen extractor fan vertically through a flat roof and am not quite sure how to go about inserting a water tight vent.

It's a standard flat roof of joists, board and felt.

Any pointers of what to use would be gratefully received.

Thanks

Miles

 

[noseall]

Use one of these...

a bit of this....

and finish it with one of these.....

 

[noseall]

You may need to fit a bit of cradling or strapping to secure the short length of 110mm pipe.

Only leave enough of the 110mm pipe showing through the lead slate as to allow the fitting of the cowl. This then keeps the cowl close to the lead slate and allows the cowl to weather the joint around the lead effectively.

The fan can be connected to the 110mm pipe via 100mm flexi-duct.

 

[datarebal]

And of course a weathering collar....

 

[Blagard]

And of course a weathering collar....

Unless the Cowl is really low as "noseall" suggests as the cowl will do the job.

 

[noseall]

Unless the Cowl is really low as "noseall" suggests as the cowl will do the job.

Aye.

 

[datarebal]

disagree with that ...

 

[Nige F]

disagree with that ...

I kind of agree - for the cost of a collar , but it must be glued on then the mushroom cap doesn`t necesarily have to be - cuz the things break off sometimes. then the lead`s got to be bonded to the felt roof - what`s best for that

 

[noseall]

disagree with that ...

Pourquoi?

 

[datarebal]

because the mushroom/cowl does not seal the lead slate to the pipe off cut,it will simply but to the top edge of the slate.

 

[noseall]

because the mushroom/cowl does not seal the lead slate to the pipe off cut,it will simply but to the top edge of the slate.

...thus acting as a weather stop/umberella.

If it works what is the problem....

 

[datarebal]

Glad it works for you....personally I get a £1.00 collar and have a proper umbrella.. each to their own on this one i guess

 

[nzwy1p]

Thanks for the advice so far.

I was looking at using a QuickSlate - http://www.britishlead.co.uk/quickslate.htm

Has anyone had any experience with these and how would I go about fixing the lead to the felt?

Many thanks

Miles