This is easy to do and makes a truss install go much faster. You can’t sandwich the foil between two objects and still call it a radiant barrier.įor truss-type attics, the best product to use is the 26″ wide AtticFoil. You need an air space on at least one side of the foil for it to work. When you eliminate the air gap, the foil is useless to block radiant heat. Why? Because then there is no air gap above the foil. This includes another sheet of plywood, insulation, storage, etc. *You can add AtticFoil™ on top of your existing plywood floor, but you can not cover the foil with anything else. Just be sure to pull the foil nice and tight to avoid anyone tripping and mark the outline (with tape or spray paint) of the decking if it doesn’t cover the whole attic, that way you will know where it ends so you don’t accidentally step off the edge and through your ceiling. Yes, you can install the foil directly over your existing attic floor decking*, it can handle light to moderate traffic. Then, use a pole with a nail to push it around until it covers the area intended.Īttic flooring/decking. Just tape a couple of pieces of foil together and let it roll down into the hard area to reach. You might have an area with a ceiling that tapers down and is very hard to reach. Try using a “Double-T” cut (see photo) to make the foil lay flat around obstacles. Just cut a slit, wrap the foil around the obstacle and use a small piece of foil tape to tack it back together. Alignment & Obstacles in the AtticĬut around supports, braces and other obstacles it does not have to be perfect or pretty – small gaps in the foil are OK. Tip: Worried about dust accumulation on the top side of the foil layer? Check out this page on Dust Accumulation and Double-Sided Radiant Barrier. When you installation is done, the foil should only have about 5-10% actual contact with the top of the attic insulation. If you have batt insulation, try purchasing an extra batt and tearing it into golf ball sized chunks and sprinkle them over the batts to create peaks and valleys. Your insulation has little peaks and valleys in it, usually these little peaks work perfectly to keep most of the foil a little bit above the insulation. The foil works best and is most effective if there is about a 1″-2″ gap between the foil and the top of the insulation. If you need to get to something below the foil, just undo the tape and slide the foil to the side.ĭo not push the foil down into the attic insulation. It is not necessary to attach the pieces, but many people will do this to hold the foil together. Overlap the foil sheets about 1-2 inches and use small pieces of foil tape to attach the pieces together. Just roll the foil up like a big rug, take it into the attic and roll it out. For example, if you make a piece 20 feet long and 12 feet wide, you can cover an area of about 240 square feet very quickly. This will form one large piece of foil that will cover more area, more quickly. If you have large, open areas in your attic consider this trick: cut the foil on your driveway (or yard) and then tape 2 or 3 pieces side by side to make either an 8′ or 12′ wide piece. You can easily stab the foil and move it far back into hard to reach areas. If the area is hard to reach use a pole, PVC pipe or a 1×2 board with a nail taped on the end. Another option is to pull the foil into the corner. Start in a far corner and start rolling out the foil over the insulation this works best when you use the pre-cut pieces. Watch the video below to learn WHY you need to do this immediately to stop the biggest energy mistake in your home. By minimizing airflow within the insulation and minimizing radiant heat loss/gain from your attic, radiant barrier will make your home more comfortable and more efficient overall. The SuperPerf foil helps minimize the convective looping within the insulation. Installing foil on top of the insulation acts like the windproof shell on a jacket. The reason this method is so impressive is because radiant barrier makes regular insulation more effective. It is typical for two people to easily install radiant barrier into an average size home in just a few hours.įor any climate that is installing radiant barrier on the attic floor over insulation, we recommend our S uperPerf™ product which is designed for maximum breathability and performance. This install process is usually pretty simple and quick in most attics. This method can be used in any climate, though it historically has been most popular in colder climates. This is probably the easiest method to install Radiant Barrier AtticFoil™ is to lay the foil out OVER the existing insulation on the attic floor. Laying Foil On Top of Insulation on the Attic Floor Radiant Heat Flooring – Over Conditioned Spaces.Radiant Heat Flooring – Over Non-Conditioned Spaces.Cathedral Ceilings – Hot/Mixed Climates.
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