Browse Forums Heating, Cooling & Insulation 1 Sep 08, 2011 11:34 am Does anyone have experience with foam panel insulation for ceilings? We have raked/cathedral style ceilings with sarking and about 50mm air gap and then the roof tiles. It gets REALLY hot in the summer time and we'd like to insulate with the ceiling foam panels that you mount between the rafters (which are exposed to the inside of the house). So I've found a product called Ceilink. The face of the panel is finished in a thin steel that's painted white and the other side has reflective foil which you place up to the ceiling. Unfortunately it only comes in 900mm wide sheets and our rafters are 1200mm apart! So I'm thinking we'll have to run them between the rafters rather than along the length. Any advice would be really good or any ideas on how to insulate in the best possible way. Another company recommended batts and then gyprock the entire ceiling, therefore hiding the rafters. We like the exposed beam look but I'm not completely opposed to that idea, we just want to be cool in summer. Re: Foam panel insulation 2Sep 08, 2011 10:44 pm I also will have raked ceilings and I've gone for iron -glareshield - battens - foilboard - rafters - foilboard - gyprock. I'm hoping the double air gap will make it as efficient as possible but I'll only know when i move in. Personally I think rafters at half depth or flush doesn't have the same effect as full depth exposed rafters so you may have to go the gyprock ceiling route. Newtown rebuild: https://forum.homeone.com.au/viewtopic.php?f=53&t=48977 Re: Foam panel insulation 3Sep 12, 2011 9:16 am If it is a product like foilboard it is very important to have the air space each side of the board and no gaps (ie. for rafters) between the insulation board as the insulation value will be decreased. If possible, lift the roof and battens. Put your insulation board on the rafters, below the battens in a solid cover. The battens will gip an air space between the roof and the insulation. Then allow an air gap between the insulation and the ceiling lining. Installed this way a product like foilboard cathedral board gives an Rvalue of 2.7. However, if you also want to stop heat / cooling loss from the inside to out, a layer of bulk insulation would be good. We are doing a cathedral ceiling and have chosen to not have exposed rafters so we can have reflective board (as above) and a 90mm high performance bulk insulation for increased R value, and conductive insulation as well as reflective, as we get cold winters Re: Foam panel insulation 5Dec 08, 2011 6:50 pm sorry i don't have any experience with foam panel insulation, but the foam insulation panels are a convenient and economical way to add insulation to garage doors, sheds, stud walls, foundation walls, attics, roofs, etc. Most of the foam insulation paneling available at home improvement centers is made of either Molded Expanded Polystyrene (MEPS) or Extruded Expanded Polystyrene (XEPS). MEPS will provide an R-value (insulative value) of about four per inch of thickness, and XEPS has an R-value of about five per inch of thickness. Either type of foam insulation paneling you use can be installed using the same installation method. Instrutions: 1: Cut the foam insulation paneling to size with a utility knife, if needed. 2: Cut the application end of a tube of adhesive with a utility knife and poke a hole through the inner foil. Load the tube into a caulking gun. Place the plunger firmly against the end of the caulking tube 3: Pull the trigger a few times to begin dispensing the glue, and then apply the glue to one side of the foam insulation panels spreading the glue in large s-curves across one whole side of a panel. 4: Set the caulking gun aside and pick up the foam insulation panel. Put the panel into place with the glued side towards the surface it is being attached to, and apply firm pressure with your hands from the non-glued side of the panel to set the in place. Repeat for each panel that needs to be installed. Re: Foam panel insulation 6Dec 08, 2011 7:16 pm Elenora, are you from the US? Those R values look like they're in US units. beck_and_bubs, as tjilpi said, it's important to leave an air gap on the reflective foil side. That is, the reflective foil is not allowed to touch anything if it's to do its job. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Foam panel insulation 7Dec 09, 2011 8:35 am I think Elenora IS in the states as you wont get Australian R ratings of 5 to the inch in Australia. I did plenty of research for my cellar and the best one foam panel I could find was foamular with a R value of 1.08 for each 25mm....(as I recall....maybe wrong as I am losing brain cells on this reno/building caper) Oh no! I would use a can of expandable foam ( there are some that will take render) then cut it back and render over the top 1 4143 There is nothing in the various codes and standards that puts this requirement on the builder to do. I think that is what you are asking. 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