Dan Posted March 4, 2013 Report Share Posted March 4, 2013 Hi all i have a block built garage in a block,we recently had the roofing replaced with metal sheeting now i know that this could cause condensation,i was wondering if any one had any ideas how to combat this?? Link to comment Share on other sites More sharing options...
BenF125 Posted March 4, 2013 Report Share Posted March 4, 2013 Hi all i have a block built garage in a block,we recently had the roofing replaced with metal sheeting now i know that this could cause condensation,i was wondering if any one had any ideas how to combat this?? Insulate the ceiling. Link to comment Share on other sites More sharing options...
Redgecko Posted March 4, 2013 Report Share Posted March 4, 2013 Insulation and proper ventilation. Link to comment Share on other sites More sharing options...
MonkeyJim Posted March 4, 2013 Report Share Posted March 4, 2013 ventilation Link to comment Share on other sites More sharing options...
Dan Posted March 4, 2013 Author Report Share Posted March 4, 2013 Insulate with what? I did think about polystyrene sheets fixed to the metal roof somehow? Link to comment Share on other sites More sharing options...
St George Posted March 4, 2013 Report Share Posted March 4, 2013 Ventilation - leave the door open. Hth Link to comment Share on other sites More sharing options...
lorenzo Posted March 4, 2013 Report Share Posted March 4, 2013 Air circulation. I recommend 2 busty ladies, in sort of toga type things, standing either side of a roman-esque throne, wafting ostrich feathers on big long sticks. Link to comment Share on other sites More sharing options...
Farmfab01 Posted March 4, 2013 Report Share Posted March 4, 2013 Put a second skin of thin plywood on the underside & in the gap put Rockwool insulation in between, also to help your workspace stay light paint the plywood with a coat or two of white paint Link to comment Share on other sites More sharing options...
VanWinkle Posted March 4, 2013 Report Share Posted March 4, 2013 use the bubble plastic stuff that hey use for greenhouses, should be at your local bnq Link to comment Share on other sites More sharing options...
jaycee Posted March 4, 2013 Report Share Posted March 4, 2013 Put a second skin of thin plywood on the underside & in the gap put Rockwool insulation in between, also to help your workspace stay light paint the plywood with a coat or two of white paint Thinking along those lines for my lock-up when I move. Considering putting gyprock and insulation on the walls too. Link to comment Share on other sites More sharing options...
Egg on Leggs Posted March 4, 2013 Report Share Posted March 4, 2013 I have a Trimetals garage that had the condensation problem. I went down the builders merchant and bought some insulation sheets and a tube of Gripfil. Link to comment Share on other sites More sharing options...
Dan Posted March 4, 2013 Author Report Share Posted March 4, 2013 Air circulation. I recommend 2 busty ladies, in sort of toga type things, standing either side of a roman-esque throne, wafting ostrich feathers on big long sticks. I already have them next to my sofa! Link to comment Share on other sites More sharing options...
sonic Posted March 4, 2013 Report Share Posted March 4, 2013 Cellotex and an airbrick is your friend.Fixed my lock up when a corrugated metal roof was fitted. Link to comment Share on other sites More sharing options...
Dan Posted March 4, 2013 Author Report Share Posted March 4, 2013 Cellotex and an airbrick is your friend.Fixed my lock up when a corrugated metal roof was fitted. How did you fix the cellotex to the roof? Link to comment Share on other sites More sharing options...
MonkeyJim Posted March 5, 2013 Report Share Posted March 5, 2013 How did you fix the cellotex to the roof? Cellotape? Link to comment Share on other sites More sharing options...
Evilchicken0 Posted March 5, 2013 Report Share Posted March 5, 2013 What you really want to do is glue the insulation to the outside of the roof and put some paving slabs on the edges to stop the wind lifting it. This will stop the air from cooling as it touches the steel roof and the water vapour condensing. You can put up an insulated ceiling but you want to have a vapour barrier (usually above the ceiling board) if you don't you still have condesation on the underside of the steel which will cause "damp" and fungus and staining and stuff .... If you use a type of insulation cellotex Dow Styrofoam etc they'll have a manufacturers website, find the technical help line, tell them the knid of build you want and they'll let you know the thickness of insulation. You shouldn't need an airbrick if you fit a ceiling there's probably enough ventilation under and around the door. Link to comment Share on other sites More sharing options...
Johnmac1 Posted March 6, 2013 Report Share Posted March 6, 2013 Lots of good advice there. Some times if you know the cause there are lots of solutions but this is the problem. Cold tin roof and warm moist air inside garage. So the main solution is to stop the warm air coming in contact with the cold tin roof. The air gap is important to let any later condensation out. A cheap option above was the styrofoam (the grey is better) glued to the sheeting 1' or 2'' but tape the joints and have no gaps at wall junctions so nice and tight more important than size. Your could also use the spray foam insulation for awkard little areas. Now make sure the wave of the sheet is open at both ends to let air pass through. I would also put in a high level vent through the wall to let out any trapped condensation out. Hope this helps. Link to comment Share on other sites More sharing options...
Farmfab01 Posted March 7, 2013 Report Share Posted March 7, 2013 Putting a second skin of thin plywood on the underside & then putting Rockwool insulation in between is what a mate of mine did & it worked perfectly & kept the heat in from his heater too!, I've been told they do the same in industrial buildings but they probably use thin steel sheet instead of plywood as it's less of a fire hazard. It works by stopping moist air comming in to contact & condensing on the underside of the cold roof Link to comment Share on other sites More sharing options...
Evilchicken0 Posted March 10, 2013 Report Share Posted March 10, 2013 Putting a second skin of thin plywood on the underside & then putting Rockwool insulation in between is what a mate of mine did & it worked perfectly & kept the heat in from his heater too!, I've been told they do the same in industrial buildings but they probably use thin steel sheet instead of plywood as it's less of a fire hazard. It works by stopping moist air comming in to contact & condensing on the underside of the cold roof Not exactly, there could still be condesation but it's forming above the plywood, probably in the insulation. Over time this can cause the steel roof to rust but then again it's a garage and it will take a while to cause real damage and you'll probably just reroof it. Industrial units do use a steel liner but it beause it's an easier and cheaper material to use than ply or plasterboard, there's no decorating (or redecorating) and it can be riveted. There's no fire requirement for a roof. Link to comment Share on other sites More sharing options...
sonic Posted March 10, 2013 Report Share Posted March 10, 2013 How did you fix the cellotex to the roof? My roof had exposed joists so just screwed it up with large washers to prevent the heads pulling through.Left a nice 120mm airgap above it too.It's so light you could probably stick it up. Link to comment Share on other sites More sharing options...
Evilchicken0 Posted March 10, 2013 Report Share Posted March 10, 2013 Did you ventilate the air gap ? Link to comment Share on other sites More sharing options...
sonic Posted March 11, 2013 Report Share Posted March 11, 2013 I didn't need too as the roof sheets were open at the ends!! Great workmanship. Link to comment Share on other sites More sharing options...
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