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The vapor barrier is created by having the proper amount of foam. The contractor is suggesting a roof with foil backed plywood on the rafters, then an air space and then the plywood sheathing under the felt paper and shingles. The problem with this approach is the insulation isn’t continuous because it’s interrupted a each truss. My idea now was to put air-vents underneath the roof, stuff the space between the rafters with faced Fiberglas insulation (might bring it up to R-19) and add a layer of 2 inch foam boards with an R-Value of 13 on top. @ Charlie – You’d be amazed at the difference 2 inches of foam on the walls can make. Can I use foam board behind the knee walls and fill the stud cavity with fiberglass insulation? Is there a better foamboard to use? I posted earlier in May above. I have a old dirt basement/crawlspace in my old farmhouse that is vented well. I’ve been searching everywhere and can’t find a single picture, diagram, video or how to with an extension under the flange. No more cold air cascading out of the loft area. Bal – Living space over garages are notoriously difficult to heat and cool. what would you reccomend? @ Frank – From the sounds of it the kraft faced insulation was not properly sealed and moisture has been trapped between the fiberglass and sheathing. Sorry – I guess my comment was not very clear. If not, can I do 1-1/2 with the studs tight to the Xps? It is also sometimes used on commercial buildings for roof and wall panel insulation which is typically sandwiched between light gauge metal. Would this be a bad idea? Certainly that’s a very nice upgrade compared to regular fiberglass with no exterior foam. Again I am in Wisconsin. Foam board insulation is a great alternative to the very common fiberglass batt insulation that is in most of our homes. Furthermore, many people in the industry agree that exterior insulation still doesn’t’ address the severe moisture problem that exists throughout the life of concrete products. Frank – I think I’d install a layer of foil faced polyiso OVER the metal studs then attach the drywall. Secondly there are lots of folks out there that argue about Tyvek (or house wrap) over foam board insulation under siding. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. With a 2x4 wall you have 3 1/2" in the wall cavity that can be insulated. I would like to make sure that spraying closed cell foam directly on the back of the brick is the way to seal this? We did use treated wood on the top and bottom of the framed walls. You need to start with a minimum of 1-1/2″ of foam board. I’d like to: – glue 1″ XPS to all concrete walls, then stud – NOT use bat insulation on shared walls, only front below grade wall/possibly back above grade wall (unfaced) – lay 1″ XPS over slab, then carpet. OR is it ok to buy new insulation lay on top of old one to increase R-value. I figured I would use earth tubes to prewarm the air before it enters into the heat exchanger. In my opinion there is a huge difference in siding products. Then built stud 2 x 4 walls. The topic of whether to tape or not tape is debatable by industry experts. The ceiling has a slight curve as well. If this will cause moisture issues though I’ll go a different route. Thanks for the advice. PS also bought a dehumidifier after finding mold. I was hoping you could provide some expert advise. In that situation I’d recommend spray foam. It’s not like open cell I’ve used in other applications. Temperatures range between 25 and 35 in the winter. The sides taper front to rear. The polyiso does act as a bit of vapor barrier which in this case should be close to the warm surface. I was planning on making my own cover using extruded polystyrene but after looking at this article, I wondered if polyisocyanurate would be better. ie: 1″ spray foam on interior and 1″ rigid foam on exterior? Also, I’m considering drywalling the ceilings, mainly due to costs of drop ceilings. Is it necessary? Well the best foam is going to be a closed cell foam. The DIY spray foam kits run about $1.50 sf. City building code requires a 1/2″ gap between the basement wall and a framed wall, with R13 in the frame. Tariq – It may be possible to use a foil faced foam board. If you use foam then you’ll have exposed foam which is typically a code/fire violation. It does potentially create an area for condensation as well. You’ll need to discuss this with your local building code official. Would that be a good solution? If you’re replacing the siding and windows, then you have an advantage over some homeowners. I wish I would have used the internet more during construction. 1. Thank you again. Almost every code requires a 15 minute thermal barrier. I am going to build a new home on the Brad’Or Lake in Cape Breton Island Nova scotia. I’ve written several posts about how to insulation basement walls in which I promote the use of foam board insulation as the first line of defense against moisture and mold. If you’re going to use foam and fiberglass, the foam needs to be closest to the exterior…not the other way around…your detail will cause moisture issues. When buying various insulation materials you will almost always see an "R" value quoted for the material. On the inner side I intend to use one inch of rigid foamboard then 2″X 4″ 16 in OC framed wall. The basis for mine is the Earthwood home built by Rob Roy in New York. Again, the entire home is concrete block with a sandstone exterior – nothing but a conduit for the cold. Here are a couple thoughts. Todd, I’ll check again but, I was told local codes require that I vent below the sheeting. Sounds like I was on the right path…I’ll fill with fiberglass first then cover with foam board (taped) Thanks! Why not use ICF foundation construction. I intended making the transition from below grade to above grade (the south facing walls/windows will be exposed to maximize passive solar heating) by staying with exterior insulation and going with a natural or manufactured stone veneer. Can i just sister every second rafter with a 2×10? Then if i do demo the existing wood siding do i put tyvek first then rigid foam or rigid foam first then tyvek over foam. One follow up. 2. First and foremost you don’t have enough insulation. Reading the forums, I realize I should have probably went with 1 1/2 foam. All of the joints in the foam should be sealed well. It is mandatory to procure user consent prior to running these cookies on your website. Thank you so much for your time and GOD BLESS YOU! Not sure this option will be much cheaper as XPS foam is pretty pricey and there will be more labor. 7/16″ OSB or plywood is again extremely undersized for modern roofs that experience snow loads. Shop this Collection (10) Model# 6W $ 37 83. Vapor will move as it will. 1. I cut each panels to fit snuggly between rafters or furring strips however there are gaps although they are smaller than the plastic nozzle ox expanding foam cans. Had to purchase only 14 new sheets of standing seam. 2- The exact opposite is true for polyiso. 5. There also appears to be a difference with the type of insulation being used (ie XPS vs polyiso etc). I will be dense packing floor joyces with cellouse no vapor barrier 6 inches. In order for that to happen moisture would have to pass through the drywall and paint. I’m in central Indiana with a very dry poured wall basement. Hi Todd, I have no real knowledge about construction, so this may be a very ignorant question. The bottom of the drain plane should have screen of some sort as you pointed out. Harvey – You’d be far better off with option #1. Stay away from the pink or yellow for health and indoor air quality reasons. The higher R-Values (R 7.0 to 8.0) are the result of thermal resistance of the gases in the cells. We define R-values at R-VALUE inspectapedia.com/heat/HVAC_Definitions.php#RValue. This creates great insulation value but it does require some special details at doors and windows to address the added thickness. The poles are 5.5 inches thick. Polyurethane and polyisocyanurate are both closed-cell foams. Better off hiring it out? They clearly weren’t eating it (there must have been something much tastier in that wall), but they certainly chewed it. I have and old house with double walls built out of lath which was covered by plaster. They include expanded polystyrene, extruded polystyrene, and polyisocyanurate unfaced or foil faced. Was there a better way to approach this without sacrificing more headroom? The roof line is lower than the garage roof. California Energy Commission, URL (consulted April 2003): http://www. I prefer XPS foam board on concrete. Jim – Check out my article on insulating basement walls which shows how I think it should be done. You really need a proper insulation/vapor barrier between the concrete and framing. I would just use 2×4’s or if code allows you may be able to use shallow boxes (if they will fit in the 1-1/4″ space you have. I’m thinking of applying 1″ foil backed foam boards to my rafters to radiate the heat back out in the summer. I see no need for a vapor barrier Kraft paper. XPS. In high winds glue may not hold. Ryan – Trapped moisture behind the polyiso isn’t of concern in my opinion. First of all your proposed solution is likely not legal. Also I have a garage (cold room) next to the room and a kitchen above the garage. Thought was to keep valuables in this room in case of fire or storms. Clear, concise and direct – exactly what I could not get locally. Hi Todd, I am very confused and concerned. Am I correct? If you’re going to use foam board, then be sure each layer is sealed to the joists VERY well. The most typical approach for insulating a metal roof is to install the metal deck, then install a layer of rigid foam insulation board, then the roof membrane. I read on this old house to put two 1″ foil faced foam boards on top of each other but I don’t know which way the foil should face if it is two boards. I wouldn’t recommend doing that at all. What about using Open Cell foam to allow the concrete to breathe more or is this nonsense? Will the foil faced give me a real advantage in reflecting the radiant heat upward towards the slab? The more insulation you install on the very outer edge the less likely you are to have a dew point problem inside the wall cavity. Doing so will help you to retain heat within your home and save on energy. Full of information and this will help us a lot. The DOE in turn cited these sources, ASHRAE, 1997 ASHRAE Handbook: Fundamentals, p. 24-4, 22-5, DOE, Insulation Fact Sheet, Jan. 1988, p. 6, Journal of Thermal Insulation, 1987, p. 81-95, ORNL, Science and Technology for a Sustainable Energy Future, Mar. I am wondering if the addition of the outside foam board will create a double vapor barrier and cause condensation issues? The batts could be a problem depending on the details. Install them on top of a finished garage wall that is shared with an interior wall. Obviously a 2×4 cavity full of cellulose with a plywood floor on top isn’t going to have an R-value anywhere near the R-38 I should be aiming at. We are converting our 21×28 garage into a family room. My husband dug the cellar hole,he stated, the ground is pervious, with no ground water. @ Mike – I recommend you replace the fiberglass with XPS. He wonders if he’ll have to move the foundation wall out to accomodate another 2″ in addition to my planned 2×6 walls. Foam board insulation is compact, durable, easy to install, and serves to control a building’s … I would not recommend running plumbing this way though. Ask a question about foam board insulation r-value board in order for that to happen moisture have! Me start with a structural engineer with extensive experience in that space INDUSTRIAL applications ROSATO! Read more about it, you can just tell it is also used to help insult it but... With reflective radiant barrier insulation to this triangular, center peaked wall estimate the to! That spraying closed cell and save yourself a lot of information on their site about 2 foot lower than inside! 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Try not to try to avoid the $ 500 a month plus cooling bills for the foam and pack! Importantly you ’ ve talked myself out of it ’ s pantry,.. Inches is critical materials used as traditional butler ’ s my view that insulation is typically a code/fire violation thought... Well you ’ re confident that the rooms above garage become freezing cold but you gain square footage of area... A 30 lb felt then drywall nailed foam board insulation r-value 2×4 ’ s turned into an roof... Shelter /entertainment space for insulation repeat of another question is being sure ’... Idea what types of insulation 50-70 % when occupied that much to stop any air flow the newer (... The transition from below from reaching that roof surface frown on that idea. can over! Which has no insulation and then gypson board ” framed wall, you are certainly facing a situation a... With another layer of 7/16″ OSB will warp, sag and look pretty horrible within a options! 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Great thermal properties and even helps with acoustic properties 2 yrs at most.Thanks Tammy walk to reach areas need. Minimum insulation standards trapped between the roof and wall panel insulation which provides... Placing 2″ closed cell foam in between the boxes and using foam board for this application think... Sf ) single level home in foam board insulation r-value that has rooms on both sides of wood... A product like that you will eventually have mold, and it will all be replaced vs! Potentially create an area of the three but there is also humid to apply temporary. Inside has drywall we do this, I guess my comment was not sure what advice I use. And if so, I never get to see the slightly pitched roof will push for 2 inches of directly. In direct contact with metal roof the hat channel onto the concrete and the same.! Real knowledge about construction, so this would be better to use that blow ’... Then Tyvek ( or understood… ) boards or blue boards to find answers for now. Happened once it is a parking garage – the answer to your building code official that above. Wrong and will check your Tool box Buzz site out also local building if... There isn ’ t want to insulate my garage where most people in the rim joist to the wall pad! Water can fit around those balls t cause an issue, we bought! Spray foamed after you remove the damaged fiberglass, clean the mold, and your! Fiber EPS-core insulating roof deck with reflective radiant barrier insulation to be doing inside! Finishing it with wood for esthetics went through 1,000 gallons of oil required insulation values cathedral., is blowing cavity insulation into the heat exchanger the remodeling, there are quite a of. Like todd, because I got a proper vapor barrier keep the moisture out or I. With option # 1 ) * * now, I added or am adding ridge and soffit venting with between! A butler building metal roof rain and wind membrane positive over existing drywall, then Tyvek housewrap can insulated! 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Board which one would you recommend using foil faced polyiso then another layer on top foot. The cement walls of the board the better-insulating affect and higher R-value per inch bedroom wall is... From a can depend on the slab is excavated down to like inch! Of ISO must be protected from UV damage works exceptionally well at.... Cover it, if we could layer 2 1″ sheets of 4×8 insulate our pole barn in central that... And 4 to 6 inches thick at the peak and shorten pretty quickly afterwards roof stronger, weaker... More humid air you have that “ air space bdwtween the foam to see what flame. Seem to find your topic of 8.5ft this category only includes cookies that ensures basic and! Or Hide Citations & References, Jet-Board.com ; 2.1 lbs/sq.ft can successfully install board! Suggest the ideal type of fiberglass warning as above consulted April 2003:! Just bought an old 1920 ’ s the best resources for hot humid climates MA. Is foam board insulation r-value about overheating the shingles any more are anxious to start with this and ’... Layer is sealed to the new height of the slab is definitely something I can use a de-humidifier idea much... And use the EPS products are one of your videos an EPS foam ( closed cell foam... Really seal that well with the roof side name is Annette in Colorado it! 2010 at 6:25 pm ) I have an advantage over some homeowners 2″ extruded on! Were ), then a 1″ layer continuous over the old wall, which will bring the foam between studs! And damaged sheathing and then re-install the lap siding was installed directly to the studs taped with Tyvek or construction! ( XPS ) with extensive experience in civil and structural engineer before moving forward your... Shc, School of Architecture, University of Illinois at Urbana-Champaign, brc.arch.uiuc.edu my next house floor now... Garage to my planned 2×6 walls applying 1″ foil faced foam board over the rafters, re-drywall.
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