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Jan 13, 2015 21:57:32 GMT
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Ive just moved to a new house. The garage has a profile sheet roof on timber joists. When I viewed the house the inside of the roof was dripping with water but I put it down to the gutters being blocked causing damp in a corner. Now Ive moved in, fitted a soakaway and fitted proper guttering. The garage walls are now dry but I still have the condensation issue. With my internet skillz Ive found that this is common with metal roofs, I have plenty of ventilation but whenever I put the heater on the same will happen. Ive looked into possible cures for this, insulation sheets and stuff don't seem to work. The best and most reliable one seems to be spray foam, like this. www.ebay.co.uk/itm/Foamseal-200-2-part-Polyurethane-Spray-Foam-DIY-Insulation-/291352673350?pt=LH_DefaultDomain_3&hash=item43d5f8fc46Has anyone used anything like this? With my luck Ill probably end up with an insulated floor as it drips off the roof... Scott. |
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Jan 13, 2015 22:21:11 GMT
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That is exactly what I was going to subjest I used something similar to seal my house roof from inside,the stuffs bloody magic...
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Ryannn
Posted a lot
Posts: 2,421
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Jan 13, 2015 22:29:11 GMT
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Ours is really bad for dripping off the roof, but I havn't found any cures yet!
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taurus
Posted a lot
Posts: 1,084
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Jan 13, 2015 22:30:21 GMT
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Do you have power in the garage? I use a dessicant dehumidifier, they work effectively down to 1 degree Celsius. The usual compressor type don't work well below 25C so are no good in cold garages. The dessicant type use more power when running but don't need to run as long so then work out cheaper to run overall. Once humidity is below 40% rust won't form, very handy when you're running old Vauxhalls!
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Jan 13, 2015 23:34:02 GMT
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What kind of heater are you using?
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93fxdl
Posted a lot
Enter your message here...
Posts: 2,000
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Jan 13, 2015 23:35:47 GMT
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Do not use any gas or oil heaters as they produce the same amount of water as fuel used
Ttfn Glenn
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mantamutilator79
Part of things
I love the smell of kerosene in the morning….
Posts: 160
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Hi,
I had the exact same issues when my concrete prefab garages were erected, but mine had concrete roof panels with a line of corrigated clear plastic panels to let a bit of light in. On damp or frosty/very cold days the condensation would form on the inside of both the concrete and plastic panels and drip down like rain on the cars. I put up with this for a couple of years before stripping the whole lot off and replacing the entire roofs with 18mm exterior plyboards and 2 layers of roofing felt. Thankfully, no further issues for the past 6 years.
It took a couple of days to complete but was well worth the cost.
Pete
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Thanks for the replies!
I'm using a waste oil heater with an external flue, so no issues with water from a space heater ect. As I understand it its the difference in temp from inside to outside which causes it, dew point is reached and voila, you have indoor rain.
Pete, Ive found a kit of DIY spray foam for £250,(in the link above) if it doesnt work Ill have to do as you have and replace with plyboard and felt. I think that might be a summer job anyway!
Taurus, I have a compressor type dehumidifier, but like you say its not much good in the cold, it just trips off. Amazing the amount of water it removes when running though.
Thanks for everyones input so far, I think Ill order up the DIY kit and see how it goes. Ill post pics up on here and keep this going for everyone elses info.
Scott.
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mylittletony
Posted a lot
Posts: 2,347
Club RR Member Number: 84
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I have recently replaced my asbestos/concrete roof with a composite steel roof. Basically 2 layers of steel with 40mm of foam between.
No more drips, warmer than outside (no heater) and cost 1200 delivered for a complete kit for a double garage.
One of my best ever purchases
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mines got some kind of 70s asbestos or similar roof and that drips
what i did was fix some batton each end of the roof and used aersol glue on the cross beams to fix up some lightwieght plastic sheet (like a bit thicker than a good carrier bag) a few inches below the roof , all pulled tight it looks neat enough and no worrys if it ever fell on the car as it wont dent it
cheap , easy and works well
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91 golf g60, 89 golf 16v , 88 polo breadvan
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luckyseven
Posted a lot
Owning sneering dismissive pedantry since 1970
Posts: 3,839
Club RR Member Number: 45
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Jan 14, 2015 10:47:18 GMT
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Interested in how that foam spray stuff works out as I have the exact same problem. Irritatingly, I paid to have the old asbestos roof on my garage replaced with a nice new metal one in an attempt to cure all the leaks. Now it's just as wet with condensation as it was with the leaks  How's yer luck, lol I was thinking of just screwing plyboard sheets against the roof supports just beneath the metal roofing sheets, but I'm not sure if that'd make the problem worse by collecting loads of water until it all comes down in one horrible mess |
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Jan 14, 2015 11:01:30 GMT
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yeah plywood is just gona get wet and fail
try the plastic sheet , £15 and no more drips , it works in 2 ways as it catches any drips but makes a insualted gap so it shouldnt drip as much anyway
the few drips then dry off on thier own without making the garage damp
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91 golf g60, 89 golf 16v , 88 polo breadvan
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79cord
Posted a lot
Posts: 2,608
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Jan 14, 2015 11:34:54 GMT
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Going for some old carpet as insulation & plastic sheet myself. Any thing that stops moist air contacting cold metal.
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Jan 14, 2015 14:13:42 GMT
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Why not just insulate it properly with 100mm celotex sheets then fit a plastic vapour proof membrane underneath that, will make it loads warmer too.
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786 
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Jan 14, 2015 17:17:30 GMT
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Spray foam is the ultimate! It's what's used to insulate most steel narrowboats these days. Costs around £800 - 1200 iirc for a 60ft narrowboat. There's a few firms that do it. I'd have thought they could do a garage for not much more than the cost of the DIY kit you mention. Be warned though, it gets everywhere. And I do mean everywhere. It also sticks like sh1t to a blanket, so mask everything you don't want insulating!!! I've done my concrete lockup with polystyrene foam sheets. About 1 1/2" thick. The trick is, to glue them to the roof sheets so that there's no air gap. I got mine for free as a local sign maker had a load of it. Apparently it's used to protect the laminate boards used for shop signs etc before they stick on the artwork. Could be worth knocking on a few signmakers doors  |
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Jan 14, 2015 18:33:54 GMT
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Just beware of what happens when polystyrene burns if you are doing any hot work, stuff designed as packaging might not have been treated to be fire retardant. Otherwise its a good cheap form of insulation.
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Jan 14, 2015 21:05:15 GMT
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i sprayed the my roof with stuff from here www.grafoproducts.co.uk/ in the summer, and it doesn't appear to be too bad so far, i turned off my dehumidifyer (proper 110v that worked well below freezing) this year and i don't have any condensation on the roof at all, i haven't looked at my bare metal panels closely yet though, but they should be ok |
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joe90
Yorkshire and The Humber
Posts: 1,027
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Jan 14, 2015 21:44:49 GMT
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mines got some kind of 70s asbestos or similar roof and that drips what i did was fix some batton each end of the roof and used aersol glue on the cross beams to fix up some lightwieght plastic sheet (like a bit thicker than a good carrier bag) a few inches below the roof , all pulled tight it looks neat enough and no worrys if it ever fell on the car as it wont dent it cheap , easy and works well Your roof panels have probably gone porous over the years and is soaking through when it rains. Bryan |
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Jan 15, 2015 12:45:11 GMT
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I think a dehumidifier is the best bet. I have eight garages with metal roofs. They all suffer from condensation. If you fit foam then the foam will soak up the water but the water will still be there. A dehumidifier will get rid of the moisture. Just use it when you need it. One of my garages I stuck the dehumidifier in for a few days in summer and it is still dry.
Charlie
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Jan 15, 2015 19:27:34 GMT
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Hardtop, how much did you pay to have yours done? I can find grafotherm on Amazon but at £290 a 20kg tub its £560 for enough to do my roof, (1kg per sqm as per website) it looks like a decent product but the foam seems to have better insulation properties and is £310 cheaper over the same area?
I was a bit surprised its so expensive, looks a bit like stonechip!
Charlie, I work away and can be away for weeks at a time. Ive tried using a dehumidifier but it doesnt keep up, plus I'm not to keen on leaving something plugged in and running while I'm away.
The more I look into it the more spray foam appeals, the only problem is you cant apply it in the cold, it needs to be 15 degrees plus! I can probably do that inside but the metal will still be cold. When I get home and order it up Ill try a wee test area first and see how it goes.
The problem is the foam has an exothermic reaction when it sets, heating the metal which can cause condensation and giving adhesion issues. I'm thinking I might be able to apply a thin enough layer to start (less heat) and then build on that when it sets to get to an inch thick?
Sound sensible?
Scott.
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How's yer luck, lol
