The Accidental Smallholder Forum
Smallholding => Buildings & planning => Topic started by: Daleswoman on July 07, 2015, 09:27:23 am
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We are going to re-roof our main building before the winter - it's currently roofed with onduline, which is sagging and leaking and breaking apart.
I've got quotes for doing it in fibre cement and in corrugated steel (lined to reduce condensation). There is a huge difference in cost because the cement fibre is much heavier than the onduline that the building was designed for, so the roof timbers will have to be strengthened.
My question is about the effectiveness of the condensation-reducing lining on the steel roof - does it work? I'm tempted by the price, but don't want to regret it later if I end up with a building that is still wet on the inside.
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we have had the 30 year old leaking wriggly tin roof replaced on our garage with 100 mm thick foam sandwiched plastic coated steel 8 mtr long sheets which should last at least 30 years .
It was done in December last year , for the first two months we had some condensation , due to the garage drying out . But from then on it's been as dry as a bone . we did also have the door frame replaced as this was also quite rotten .
Due to the rigidity of the sheets we didn't need to add extra roof supports but I guess that with your shed , if it is a big one you may need them as the panels are not exactly super light .
Getting the closing cappings done all round the edges , around the profile & at the back edge was very carefully done with shaped foam strips and 150 mm right angle metal skirts.
The rear end where it runs off into the gutter was plugged with the preformed foam strips , then the builders replicated the profile on some cardboard which they transferred to some UPVC strips then cut to shape with a jigsaw and super mastic glued them on in front of the foam strips to protect them from the weather & UV .
I sealed the concrete garage floor with 5 litres of Finigans concrete sealer using a sweeping brush to apply bit once it was dry to stop not only dust but any rising damp that may happen . We also used a pump up fence sprayer to spray the walls with a further 20 litres of the sealer on the inside of the walls as the external render is a bit suspect now it is 30 years old .
We are very satisfied with the job , it's been well done (All the joints were sealed with a 30 yr viable SIKA ( sp ?) non setting mastic .
It has stopped the frequent water logging of the garage which started to cause problems to our washer , dryer , the freezer and all my tools and metal lathe every time it drizzled let alone rained like it has done here recently .
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What is you building used for?
If it is for animals then you will probably want to go with the fibre cement but if not then the lined box profile metal should do.
My general purpose shed (for storing the tractor, tools, the odd hen, etc. has a lined metal roof, all the eaves etc are sealed. I get no condensation at all.
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Thanks for the replies - it is for an animal shed so I will probably stick with the fibre cement option.
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Just a quick update on this. Someone at Onduline picked up my original post and emailed me with an offer to come and assess the old roof. They did come, gave advice, and made me a very good offer on a replacement roof (mine is apparently over 20 years old, and has done well to last so long). I'm not going with an Onduline replacement but I really can't fault their customer service. It's nice to say 'well done' to a company for a change!
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That is impressive customer service!
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We have Onduline on our sheds and our hen houses and it's been great. Glad to hear their customer service matches the product. :thumbsup:
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We had onduline on a stable and after a few years it began to sag. Maybe with more support it would last longer!
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We've been very pleased with the lined steel. Just watch if you have vision panels in it because you still get condensation there. I have one stable with steel but no lining and that is like standing under a shower some days so the lining makes a huge difference. Though headspace and ventilation are also important of course.
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We had onduline on a stable and after a few years it began to sag. Maybe with more support it would last longer!
I have a friend who builds stables,kennels and sheds for a living.
He deals with onduline a family member had some kennels from him and i went to see them when pitched roof was built they cover it with 18mm plywood before the onduline sheets are fitted.
Next door built a large stable block and they used same technique.
Looks like it needs extra support
Think a lot of people fail to do this when installing it
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Yes, I was recommended to line it with plywood - trouble is, it increases the cost - not only the cost of the plywood but the labour to install it (Am not agile or brave enough to DIY roofs!)