Back from holiday now and doing some long overdue postin'. First a job that really sucked.
When I first installed the bathroom extractor fan (using the term "I" though I actually paid for this one), it was a quick job so I could continue with the bathroom work. The issue that remained was that this loft is an un-insulated cold space (particularly after I boarded it over) so hot steamy air, going upwards from the bathroom through the cold will eventually condense in the hose; and condensation in a hose over a long period in the cold eventually means mould (which rhymes). The flexi-hose that was used also has rings which impact smooth air flow, which leads to more condensation and you guessed it, more mould. Yuck!
The solution was twofold. First I'd replace the flexi-hose with rigid 4" plastic pipe to increase airflow and then wrap the pipe with insulation to protect it from the cold. All this should reduce any condensation in the winter and reduce any green stuff growing.
The pipe was awful on the inside when I took it down - looking like something out of a low budget 1970's gore movie. So bad my that even my camera didn't want to look at it.
However, the rest of the job was actually quite easy. Frustrating, but easy.
Tools required:
- Lots of plastic pipe and some elbows - 45 deg and 90 deg
- Hacksaw
- Plastic pipe sealant - had this leftover from the kitchen
- Measuring tape
- Duct tape for plastic ducts - not normal duct tape which doesn't work on ducting, go figure
- Cable ties
- Condensation collection tray - not used, but could have been
- Draft flap - I ended up buying a second one of these as it only comes with one spring and feels way to flimsy by itself. And yes, I paid £4 for a bloody spring.
The first thing I discovered was that the flex hose wasn't vertical in though the ceiling - grrr. I had to get out the saw and cut both the ceiling and the loft board above to get the pipe vertical.
Then it was a bit of a Lego operation. I connected the part on the right first as it had little room for maneuver here.
Next I did the exit pipe on the roof end. The opening on the roof tile was less than 4" so I had to make the pipe "fit". This involved wrapping some tape around the inside, cutting 4 slits on the outside pipe and compressing it with cable ties. Not pretty but it works and this in the loft after all - don't plan on showing this off to too many people (just the internet).
Finally it was about connecting the rest - which was a bit of trial and error. Pipe was easy to cut using a dull saw blade and deburred with the edge of a Stanley knife. Bonding everything involved putting sealant in the inside and taping the outside. I needed to run a small offset using 45 deg bends to line everything up properly.
BTW .. You can see the water mark from the condensation on the chipboard. I wasn't joking.
The last step was to put on the wrap. This stuff was just bubble wrap stuck to foil - and way overpriced. But it worked OK. It was held on with duct tape and cable ties. Again - this is the loft so who cares really what it looks like.
The result. The sucking sound could be heard instantly. Whoooosh! I'm not sure how much the extraction increased as the mirror still fogs up when we take a hot shower - but I'm convinced that things are less foggy now and it clears faster. As for the green stuff - it's still too warm outside to tell but I'm guessing it won't form this time around. But let's see.
Anyway, I'm glad to finally get this sucky job finished.