Radiant Barrier The Radiant Barrier Guru. OK, so you want to know more about Radiant Barrier. Web portal for buildingrelated information with a whole building focus provided by the National Institute of Building Sciences. Areas include Design Guidance. This guest post comes from a reader and friend of One Project Closer, Chuck Williams. Chuck is an amateur carpenter and DIY weekend warrior. During my efforts to. Prodex Insulation reviews. Reviews by customers of Prodex Total 48 Inch Insulation. First check the questions and answers below and see if your question is already here. Theres a good chance that it is. If not, no problem, just use the. Ask The Guru Radiant Barrier. OK, so you want to know more about Radiant Barrier. First check the questions and answers below and see if your question is already here. How To Install Subfloor On Joists Vs Trusses' title='How To Install Subfloor On Joists Vs Trusses' />Radiant Barrier and Radiant Barrier and Ill send you an answer shortly. I live in Michigan and want to use Radiant Barrier in my attic. I want to staple to the bottom of the roof rafters. Joist_%28PSF%29.png' alt='How To Install Subfloor On Joists Vs Trusses' title='How To Install Subfloor On Joists Vs Trusses' />I am going to leave 3 inch space on the bottom and three inches on top. I like to use non perforated barrier, I think it does a better job. Since both sides will be ventilated and the same temperature, do I have to worry about condensation, or can I use it The perforated and non perforated solid radiant barriers work exactly the same. The holes are tiny pinholes about 12 apart. BIhPZc-9o/hqdefault.jpg' alt='How To Install Subfloor On Joists Vs Trusses' title='How To Install Subfloor On Joists Vs Trusses' />I can maybe be of some help. Due to brown rot because of design flaws I have personally rebuilt about 1,300 sq ft of our place. Footings, piers, beams, joists, moving. These are views from my next new 6ac home site, overlooking Drayton Harbor, Blaine WA. Home will be single level above full walkout basement, above grade, on a 122. Workbench Plans With Drawers How To Build A Deck In The Ground Shed Products For Dogs Workbench Plans With Drawers Directions On How To Install A Shed 12x16 Steel. How to Make a Hanging Ghost Outdoors. A hanging ghost gives your porch or yard a dose of extra scariness for Halloween, as the haunting figure moves a bit in the breeze. The difference in effectiveness of the two products reflectivity and emissivity is so small its not even measurable. Vapor barrier radiant barriers should be used with caution regardless of location. The general theory is that you NEVER use a vapor barrier unless you are SPECIFICALLY trying to stoptrap moisture in its vapor form. Physiology Books Pdf more. In an attic, you WANT air and moisture to flow freely to maximize the drying process. Therefore, it is NEVER suggested to use a vapor barrier in a vented attic application. If the effectiveness is the same, why risk introducing something that can slowstop moisture flow out of the atticAlso, you CAN get condensation on ANY surface if the temperature is below dew point and you have a source of warm moist air. Ventilation helps, but you REALLY want to eliminate the source of warm moist air. I am planning to install your Radiant Barrier over the winter. Almost everything that I need to know has been readily available on your site. I just have 1 question. Is there any diference in running the Radiant Barrier up and down the rafters instead of across. Due to the number of interferences in my attic, going up and down would be an easier install versus going across. Thanks in advance for the information. It does not matter which way the Attic. Foil Brand Radiant Barrier is run. Generally, its easier IF you can go horizontal, but some attics it works best to run up and down. If you need a smaller width roll just use a power saw miter type or table to cut the whole roll. You can easily make 3 x 1. I covered the underside of the roof starting 3 feet from the soffit and ending about 6 8 inches from the roof vent apex. Is it enough to get a good benefit from the radiant barrier In your figures you show the barrier starting at the vent. Will the air from the soffit not be able to get behind the radiant barrier and carry the heat away if the barrier is not low enough Thanks for any help. You are fine. Air will naturally find its way to the top of the attic whether its behind, or in front of, the radiant barrier Attic. Foil. Starting 3 feet up is not ideal, but radiant barrier has a cumulative effect. The more of the roof you cover the more benefit you get just like shade. If its not too difficult, Id try to cover as much as possible. I live in the Washington, DC metro area and want to increase the insulation in my attic. I received an estimate from a company to add additional cellulose insulation in my attic and then add a radiant perforated barrier on top. Does any space have to be left between the cellulose insulation and the radiant barrier Thanks for your help. An HVAC guy told me that radient barriers will change the dynamics of a balanced system. My system is poorly designed so that The MBR upstairs gets very little airflow and is either too hot or cold. I have an 1. 1 year old, 2. He states that by over insulating or otherwise dramatically altering the temp. In essence you may end up with a unit that is too big for its needs. I cannot afford to have the ductwork redone properly. Im interested in your response. Thank you. Thanks for the comment. The fact is that MOST air conditioning systems are oversized. In fact, we tend to size our AC systems to handle full load which is usually the hottest day of the summer however, we are usually only at full load about 2 of the time. So, in reality, most systems are oversized 9. Normally, this is not a huge issue. However, anything you do to drop the load more including installing radiant barrier can cause most systems to be even MORE oversized the difference between what it can do and what you need it to do becomes a big difference, which could result in a lack of dehumidification but this really depends on you climate area. If your air conditioner is short cycling then you have a couple of options. The easiest method is to install a dehumidifier to pull out extra moisture. Or, you can install a two stage high low capacity air conditioner. Personally, I like to use air conditioners that use inverter systems. These systems are made by companies like Mitsubishi, Daikin, LG, Sanyo, Fujitsu and many more. Inverter type air conditioners are similar to a cruise control on a car. The adjust the flow of refrigerant based on the load. An inverter system will run longer but pull less amps resulting in more dehumidification, lower energy bills and less of a muggy feeling in the home. For you particular situation, I would install a radiant barrier. Then, if the humidity is too high, install a plug in dehumidifier. We plan to install foil radiant barrier in our attic. As I understand it, it is better to install the foil beneath the rafters rather than between them, right And running it horizontal would make it easier to install. Would outside AND inside radiant barrier treatment help, or not We could paint the roof dark asphalt in Texas sun with radiant barrier paint reflective to 9. Would this help Yes, you want to install the foil across the bottoms of the rafters so you can eliminate the thermal bypass that would occur if the ends were not covered. And yes, you could paint the roof if you dont mind the color of the radiant barrier paint. There are actually reflective coatings specifically designed for roof applications. As far as doubling up the barrier though on the roof and in the attic it would only really help if there was a large portion of the attic you could not get to. Otherwise the foil is blocking 9. I live in a top floor condo in Dallas that was built in 1. I would really love to install a radiant barrier. I dont have an attic or even a crawl space. I think the only two options I have are 1. I need and attach new sheetrock. So basically drop my ceiling by an inch. Will this second option work since the radiant barrier will be below the insulation above the original sheet rock ceiling Yes, we have had cases where customers did an install similar to this attaching wooden strips over the existing drywall, stapling foil to the wood and then adding a new layer of drywall over it. However, the foil really needs to be closest to the outside in order for you to see a real benefit from it as a summertime heat blocker. If there is NO insulation in that ceiling which is unlikely, then you could get a benefit from the foil, even though the drywall is there. However, if there IS insulation up there between the rafters, then I hate to say it, but without removing the assembly and adding the radiant barrier closest to the roof, you arent gonna get the great results you are probably hoping for.