Kitchen Extract Letting Rain In

I have a kitchen extract fan in the ceiling that's ducted to exit via the roof and when I was in the loft, I noticed rainwater running down the outside of the duct. It hasn't touched the ceiling yet but the wooden board holding the extractor fan is completely rotten.

I called the factor and they arranged for their contractor to go up and have a look and they sent me some pictures (attached below). Looking at the pictures, my untrained DIY opinion is that part of the flashing has somehow ended up at the top of the duct, creating that gap at the bottom allowing water to run in. Pushing that metal disc bit back down and silicone it in place would be sufficient to keep the rain out.

The contractor has told me that what has installed is old and not in use anymore. He has quoted to remove the existing ducting and replace it with a 4" UPVC pipe and macflash roof flashing.

Is this the proper way to do it or is it unnecessary work?



P.S. the insulation is on the to-do list, whomever renovated the flat prior to me purchasing it was an utter cowboy and I've spent the last 8 months fixing his mess. Don't know whey they felt the need to remove all of it and pile it in a messy stack.

The contractor is right and the pvc is the proper way

Thanks, figured I'd check just in case I was getting quoted for unnecessary work. That's another £300 gone, these repairs are starting to tally up.

Out of interest, why is a smaller diameter and plastic duct the way its done now?

or fit the weathering collar properly ....currently hanging from the cowl

Yes that was my first thought. Data

datarebal said:

or fit the weathering collar properly ....currently hanging from the cowl

Click to expand...

That's the bit I thought needed fitted properly and siliconed in. I'm assuming the wind dislodged it. I'd give it a try myself but 4 storey tenement building and no anchor point, don't fancy my chances.

So should I find a contractor that'll fit the weathering collar properly or just get the whole thing replaced?

tbh honest it looks like a boiler flu has been used. f its really tricky to access then change it to a mushroom cowl.collar ,and an off cut of above ground pipe...and a new lead slate

otherwise refit the collar

The guy who renovated the flat before I bought it was an utter cowboy so not surprised to hear it's bodged. Just another fix to be added to the list

The existing duct is relatively accessible via a skylight but just dangerous cause it's 5 floors up (4 floors and a loftspace) and no anchor point that I can see. Roof work is definitely out of my DIY capability and comfort zone, guess I'll just shell out the cash and get it done properly so I can stop worrying about it. There goes my disposable income for another month.