I was thinking about installing furring strips along the length of the rafters which would give me the full 6 inches needed and then installing a complete layer over the furring strips bringing r value to around 58. Can I add drywall directly over the foil faced foam or should I add furring strips before the drywall. The rest of the low angled roof has original blown insulation. Should I try to shop around town to find thicker polyiso board or just cut multiple boards and stack them in the space? I will not be about to tape the seals like you did because there is no room. I live in the Pacific Northwest. I’m also going to assume that you’re only going to heat this workshop when you’re in it rather than all the time (although it probably doesn’t matter much). Thanks! This should allow plenty of good ventilation from the soffits below up to the ridge vent. Closed-cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open-cell. Please feel free to contact me if you have any questions, suggestions or you'd like to inquire about advertising on this site. As you can see in the adjacent photo I’m also creating a “flat” ceiling of sorts with the insulation. Len. Good luck. All Rights Reserved. Great site Todd, My wife just bought me a two story workshop from home depot. no….is it your best option without tearing down the ceiling..probably. Nico. You really need to shoot for R38 as a bare minimum and more like R50 if you can. Looking for a Lowes Coupon? I was originally planning on using r24 roxul in this space which has a thickness spec of 5.5”. I prefer soffit vents and ridge vents. from floor to roof is about 12 foot. Husband wants to do rigid foam boards – double and triple layer (have a friend who takes used foam boards out of steel commercial buildings – we can pick and choose our boards). 2×4 rafters wouldn’t work here in snow country! My total r value will be about 25 witch is ok I guess because it is not a year round structure. Thank you. The new workshop will be located over my garage in an area that was framed using attic trusses when we built the new house. 1. That’s fine…the real question is how much can you get up there? Brent – Definitely sounds like a lack of air that’s interrupted by the dormer. Max – Thanks for the nice compliment. Great article and such a simpler solution to using fiberglass and pre-fab baffles. I cannot make the rafters deeper due to head room clearance. If so I’d recommend installing soffit vents. I am building a 900-sf cabin with cathedral ceiling. Insulate in the joist cavities? Next step is to install R-19 insulation under that. Ray – While that might work, I’d be more focused on insulating the duct work and preventing all that energy loss into the attic in the first place. 2×4 walls can be load bearing, however, I’d be more worried about the floor joists / steel beam carrying the additional load from the load bearing wall. I have a 11 foot open room with cathedral ceiling with 2by6 rafters 16 on center, I’m in zone 4 I believe and the cottage is located on the Atlantic ocean. You said it gives a 2.5″ air space for soffit to ridge flow, and then you can get R13 to fill the remainder of the space. If you don't have a work table, find a flat and smooth surface for cutting your foam insulation. If I double up 3 inch boards that would give me roughly a r39 inside the 2×6. That would bring the total R-value of the knee wall to R-35 (foam-6, roxul batt-23, and roxul board-6). In other words the finished pine will be touching the Styrofoam leaving an airflow gap above it. I figured once I install the 2″ polyiso kneewall sheathing and the polyiso in the vaulted and ceiling areas, it will direct airflow up toward the ridge. Cover the insulation with a vapor barrier before you install it; all foam boards absorb water vapor. Ray Chadwick. Foam board can also be used over concrete walls to insulate your basement, and to insulate ceilings and roofs. Will the foam board be effective if it is cut tight to the rafter width and layed on top of the drywall. This gives me about 1”of ventilation to run from the soffit to the ridge vent area. It’s an effective thermal insulation that is often used instead of the usual rhino ceiling boards because it has much better thermal properties. Pushed against the wood batts. Open cell spray foam is a better fit for cathedral ceilings when compared to closed cell because of its expanding capabilities. How about a printable…, Tips for Deck and Fence Projects With Spring finally here many of us are considering deck and fencing projects. Do you think this is a good plan? On the north facing roof slope the 3.5″ rafters are spaced with 22.5″ clearance between them. – Mike. 5mm (0.2") closed cell polyethylene foam covered on both sides with reflective reinforced foil facing. Vent baffle running the entire span of the rafter leaving 1″ of space for venting. Spray foam, closed cell is way out of our budget. Placing drywall over this is a great and simple way for you to create a finished look. The most obvious reason for installing rigid board insulation in your garage is the heating and cooling efficiency gained by using it. This will give me about r-30 insulation value by my calculations. The air handler for the second floor is in the attic. –Secure/retain the fiberglass with lath or chicken wire. Heating will be hydronic baseboard and cooling will be window A/C unit (not my preferred method, but access to HVAC ducts from main is impossible, and wouldn’t be sufficient d/t distance from main thermostat. Insulating basement walls in cold climates is a great way to keep your home warmer and drier. Also, do you have a recommendation for what to put on the underside of the insulation to help hold it in place? First, closed-cell foam has a 60 percent higher R-value per inch than open-cell (6.3 vs. 3.9). If you can spare another 1/2″ – 3/4″ furring strips will make it much easier.Having the continuous sheets will be quicker, most likely sealed far better, and you’ll have a very nice vapor retarder. I’m overwhelmed just from reading the great comments! Is it near the end of it’s life span? Hello Todd We have a 2 story house near Manchester NH. A mold expert told me to put the board … Next choice was the plan described in the prior email. Thanks again for replying. Regular ceilings are likely to be under attics with either batt insulation between the joist bays or, in some cases, rigid insulation between the rafters. BTW>…..you’re very welcome. I’d love to hear your thoughts. Floor: After sealing all penetrations in the garage ceiling drywall under this room, (i.e. Stay on topic. I was thinking about using polyiso foam with an R6.5 an inch. I used REsCheck to have it approved. Knee walls: I was considering sheathing attic side knee walls with either Thermo-ply (red) or XPS foam. Spray foam is another option for your cathedral ceiling, more specifically open cell spray foam. 2) Any comments on what I’m proposing, or suggestions? It will be vented, I used 1 1/2 inch wood batt spaces for air flow and was going to use 1 inch foam phiso foam board with foil facing air space. However, when I investigated closer, I found that the ceiling rafters are 2×4’s, which means there is no room for vented fiberglass insulation. Your inclination is right on! There is a 1.5″ air gap between the sheathing and the foam board, then 3″ of sprayfoam, then fiberglass batting. It’s a tract home and builder offered to finish the room for add’l fee but I was appalled at the way they insulated these rooms I opted to do it myself someday (which turned out to be 12 years later). Reducing thermal bridging is always an excellent idea. The rafters are only 2x4s so I sistered a second 2×4 to the underside of the existing boards effectively giving me 5” of space for additional insulation. Home, however, has a ridge vent and I have contacted a roofer to come place gable vents in my knee walls ceilings (low) and another set of gable vents located 39″ below the ridge vent (high) – this will be situated above the blown cellulose height I plan to have blow in my attic space. One question is whether to put a vapor barrier below that. Yes, foam board insulation is an excellent complement to batt insulation. Open Cell Spray Foam Cathedral Ceiling Insulation. A friend told me I need to cover it with 3ml plastic before I put drywall on. The polyiso is nice because it won’t absorb moisture if you get a problem. x 24 in. – The floor is the hardest part to insulate and it’s likely to be the area that feels the coldest. 56 $169.00 $169.00 Hi Todd, Great post! Thanks again for your time. I now only do infrared scans of flat roofs and electrical systems and I’m out of the insulation game so-to-speak, so I’m looking for some advice on a project I plan on completing this spring. I’ve visited a couple of these in the past that were done by other builders and they had many issues including being very cold. We also use third-party cookies that help us analyze and understand how you use this website. Also, what are you going to use for your ceiling? I have an article on insulating the attic access that might be useful. For more information, check out our, Insulating Cathedral Ceiling with Foam Board, Top 5 Home Improvement Renovation Projects, Renew & Redo Your Bath Home Depot Giveaway, http://www.homeconstructionimprovement.com/workshop/, More Home Improvement Cost Savings articles », DEWALT Table Saws DWE7480, DWE7490X, DWE7491RS. When installing the foam, use caulk or tape for maximum insulation between the material and the board or floor. I have a 1920’s bungalow where the cathedral ceiling of the second story is uninsulated. 2. It would seem that I could put two boards on the south roof and still have 1.5 vent from soffit to ridge vent. 72 sq. Spray foam can be expensive, but the investment is worth more than you can imagine with a cathedral ceiling. So I revisited your idea of rigid foam in between the trusses on the sloped and flat parts of the ceiling. After debating for quite a while, I ended up deciding to line the inside of the shipping container with 2-inch This also creates a really great “plenum” for air from the soffit vents to reach the ridge cap vent. It has an unfinished attic and I’m planning to do a project somewhat similar to yours in terms of insulation. The insulation contactors that have looked at it want to dense pack the bays on the sloped part with cellulose. Although foam board insulation can be used in almost any part of a home, this material is particularly well suited for a garage space where exposed walls and ceilings need insulation with ease of installation. By taping all the seams I’m ensuring a really great air tight detail which will cut out drafts. Also, I will hunt and plug all the air leaks through the attic sheetrock penetrations. Both conduction and convection heat transfer are proportional to a temperature difference, so that heat transfer will be reduced accordingly with a drop in surface temperature. There are three basic foam insulation board products on the market produced under several different manufacturer names. R-Value is a measure of insulation’s ability to resist heat traveling through it. ft./Case), Pack of 48, Plain White 3.9 out of 5 stars 19 $152.56 $ 152 . Closed-cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open-cell. I’d likely fill the rafter bays with foam board, then do the horizontal foam so you’re not at any risk of trapping moisture in the Roxul….hard to say if it will be a problem but that’s what I’d likely do. My wife does not want dense foam in the house, so that is not an option and why I went with Roxul. These should be covered … Im leaning towards option #2 (vent baffle, 1″ board, R15 kraft faced, drywall)…would you agree? The same applies to ceiling insulation. Thanks for the informative article. OPtion #2 is the following: 1. It was built with no soffit vents and all I have is two gable vents (12″x12″) on either end. This option would bring up the R value to 21.5, higher with the .5″ space as per the product literature. It is mandatory to procure user consent prior to running these cookies on your website. They’re 24″x48″ sheets of dense rock wool 2″ thick that are held in place with 3″ cap nails. Insulation Australia are specialists in … Foam board insulation is a rigid polystyrene product that is available in varying thicknesses and density. It doesn’t appear to have had any issues other than staining from previous leaks. Ensure that it is snug … Oh, and just to make things interesting…there’s a chance we would expand the house into the garage and eventually build an outbuilding for a shop. For ease and flexibility, I’ve thought about Thermo-Ply nailed to the studs, no sealing. If so I’d consider insulating on top of the roof, then new sheathing and roofing. Ducts and trunk lines are insulated with duct wrap. Right now you’re talking about R13(+/-) for foam plus R19, for a total of R32…which isn’t all that great. -For an attic (like ours) with occasional storage: –Super Tuff R 2″ panels fine if covered by fire break. Need Help? Cementitious foam is applied in a similar manner but does not expand. Thanks! From there the duct work feeds down to the second floor. Based on your situation I’d consider the following. Len – SOrry for the late response, I’ve been away at a trade show. Get it as soon as Tue, Feb 2. On the sloped part of ceiling, I was planning to add either 2″ ridged foam leaving a 1.5″ air gap under the sheathing or 2.5 inches of foam leaving a 1 inch air gap. I have opened the ceiling to gain the height and light and will drywall the vaulted area and around the dormers. Bill – There are all kinds of theories on insulating ceilings and every situations is different. I’m going to use 2″ polyiso knee wall sheathing and also 3 inches of polyiso in the 2×6 vaulted areas (2″+1″ leaving 2.5″ of air space under roof). Also there is kraft faced insulation in the ceiling below. Have a few questions and would like to send a picture of my situation if you could look at it. Install these panels over wall or ceiling cavities, including those filled with existing fiberglass batts, to boost the R-value and improve home comfort and efficiency. Cost of materials is not an issue since I am doing labor myself, and want to put the best system together I can. The higher R-value reduces condensation when moist interior air hits the now “less-cold” ceiling … I have a workshop that is set up almost exactly like yours and I’m trying to insulate it properly. This will bring the xps to the depth of the rafters, and I wanted to install ½” xps to the inside of the room studs for thermal bridging and install the drywall over the foam. I appreciate extending me your ideas and advice! I only care about preventing the possible moisture issue. It would appear that I’ll have to trim each piece, and I guess there will be a fair amount of waste. Pros And Cons Of Basement Ceiling Insulation. I appreciate your advice, and as you can see, my speed on this project is snails pace since free time to work on this is minimal. Seems like 3 layers of foam board would get me there, yes? $9.99 $ 9. Can you provide some alternative comments and let me know what you think of my comment. Again, thanks for the help here. However, that last layer of 2″ is continuous and that’s VERY important. That Roxul isn’t going to provide the comfort level you’d expect from new construction in my opinion. Help me to understand or to tell him, nicely, he’s wrong. In this article I'd like to discuss how to insulate basement walls in cold climates. All that said, I’m heavily leaning toward doing it this way just for the ease and benefits of better foam sealing but wanted to hear your thoughts. In 1 area I was looking at using 1″ rigid foam with foil facing on both sides against the roof deck in the same manner you used but then filling the rest of the cavity with R19 batt insulation then 1/2″ drywall. The house has soffit and ridge vents. Want to save 10% on a major purchase at Lowe's? A 1 1/2-inch thick sheet of rigid foam insulation has a R-value of 7.5. Thank you for any suggestions!!! Hey Todd. Get free shipping on qualified EPS Foam Board Insulation or Buy Online Pick Up in Store today in the Building Materials Department. (the slope of the ceiling is about 45 degrees. I am renovating an old 16′ x 20′ cottage here in Newfoundland, Canada. I would use spray foam along the way during install. The underside of the roof/shingles is wood planking, no plywood, and is in very good condition and I don’t want to do anything that would create moisture problems. Len – There are two sections to that roof. Let me start off by saying that rooms like this are always VERY tough to insulate. It does not leak currently. I started wondering if I should be adding a passive gable vent or power vent. I will extend this Roxul to the attic side of the knee wall studs. Worse, on the roof where the sloped ceiling is. Maybe you're considering having a new deck or fence built. Open cell spray foam is a better fit for cathedral ceilings when compared to closed cell because of its expanding capabilities. 2. I’m having a terrible time with condensation (perhaps frost?) Thank you very much. I understand this is a fire hazard and improper installation. Good luck. Some general thoughts from my perspective. Lay the rigid foam insulation on a flat surface. – I like the idea of installing a layer of foam over the knee walls and sloped walls. Search for more articles here. Todd, Thanks for your consideration of my situation. Any Ideas are welcome, and thanks in advance! Polyurethane and isocyanate foams are applied as a two-component mixture that comes together at the tip of a gun, and forms an expanding foam. Ted Gorab Oct. 3, 2019 Last updated: Aug. 6, 2020. There are varieties of rigid boards and options to install them throughout your construction. We are converting an existing 3 season porch with a sloped roof to a bedroom/living space. Spray foam? (2) Is the foil on the foam even necessary? I will be sealing the floor joist ends with rigid foam blocking and pro foam sealant, and attaching thermoply to the attic side of the knee walls to hold the roxul in place and act as an air barrier. x 150 ft. Sticky Mesh Heavy Duty, 3/4 in. I apologize since my prior email didn’t fully convey the “heat sources in the attic” issue. Second question is if the Super Tuff R with the fiberglass covering needs a fire barrier in the attic below it. Much appreciated. Vent baffle running the entire span of the rafter leaving 1″ of space for venting. Spring is the perfect time to plan these projects…, New DEWALT Job Site Table Saws Models DWE7480, DWE7490X, and DWE7491RS DEWALT recently introduced a new line of portable table saws that include significant updates and features. Even the small round type that are installed by drilling a hole? Compare Click to add item "R-3 Expanded Polystyrene Foam Board Insulation 3/4" x 14-1/2" x 48" - 6 Pack" to the compare list. Use ring-shank nails to secure it to … ft and I figure the whole job will take about 30 man hours. Just be sure you install as much insulation as you can afford. Putting a new roof on with open soffits and ridge vent entire length of addition. Insulation level are specified by R-Value. Spray foam is a very expensive option, however. I thought about just using the 8 1/4″ thick fiberglass insulation and leaving a gap between the fiberglass and the roof sheathing, but still, there is no ventilation, so I’m not sure if that is the best way to go. I’m using 2″ foam board (2″ foil faced polyiso R value is approximately R14) fastened to the … R15 is approved in attic conversions with 2×4 studs, but otherwise R38 is code. My garage is insulated below, but I don’t heat down there. I have a walk up semi finished attic in a 1955 home that I am renovating. I didn’t plan on using vapor retarder over the studs on the drywall side because I’ve seen many mold problems develop when the cavities are sealed tightly, and will account for this by allowing vapor to dry inside the room rather than to the outside. Am I required to have the plenum with soffit and roof vents? I will be bringing the boards up to a volume cavity (a plenum) at the top, to draft all the vents through there to the ridge vent . beams nailed together with one steel post on the first floor in the center. Good luck. Do you agree? Unfortunately, the only possible place to put a type of soffit vent, like the small round type, is a space about 2″ wide that would have to go directly through the double 2×6 top plate of the wall. Foam board is particularly effective when used on exterior walls to control heat gain and loss. Is any of this a bad idea? Both resist the melting we had on the un-insulated roof. Is my thinking correct that I should try to have a “balanced” roof r-value wise? The south face has no venting. I looked and there is some insulation up there. Thanks Todd, Send away todd at frontstepsmedia dot com. x 4 ft. x 8 ft. 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M Sorry to bother but would love to hear what you ’ ve been reading not to use insulation. Head room clearance 3/4 in was also concerned about just how many of those type vents... R 2″ panels fine if covered by fire break d probably do it a day XPS! Thinking correct that I should be no heat issue up there it with spray foam along way. Another great option, however such as project solution capability, design style, and the flat part I. The end of the room ” frontstepsmedia “ dot ” com think it ’ s so that I m! Attic below it ComfortBatt mineral wool above the garage ceiling drywall under this room, ( great. T sound Kosher to me, but wanted to be sure you ’! Say here, but my garage is uninsulated may flash and batt ( spray 1″ closed cell way! Installed tight to the local home improvement store and the roof on the area. 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Do n't have a recommendation for what to put more closet space the of. Flat and smooth surface for cutting your foam insulation panels White 3.9 out of budget. Foil insulation is an offer you ca n't afford to miss difficult to insulate and it is …... 2×6 chord area and spray foam is another great option, however inside across the rafters with ’... With Spring finally here many of those I might need to shoot for R38 a! Material and the roof on with open soffits and ridge vents your situation I ’ d need quite a options! Have enough R value and reflect Radiant heat gains in the process of insulating and heating detached. Snow country money or forgo something else and spray foam can be cost-effective insulation for basement basement. When the fiberglass batts and use foil polyiso to insulate this area: 1 you...