I dont want a mold issue. 2 might meet your local code but you should check. In that area you want to be sure you install a thickness that provides the minimum R value required by code. Also if I use 4 by 8 polystyrene compared to the foam which is more economical? Sometimes its best to use 2 polyiso at the eave to create a dam, install a proper vent, then use blown in cellulose. Do I need to seal these gaps and if so, how? Thanks for the great blog. My new questions are- Should I use house wrap over the fiberboard before the furring strips or leave bare? Have you heard of this happening when drywalling over foam board? Drop ceiling are better just for future access. I live in north central connecticut, my house was built in the 50s with a Frank loyd Wright design in mind (not original Frank L Wright).It s 2 stories about 3600 sq ft outside. If it were me Id do this: Install fiberglass insulation in the cavities. Its certainly a very good option. The finished side is actually the upper pitched end of a living room with a cathedral ceiling. If the foam goes from floor to ceiling and its properly sealed then it creates a great vapor barrier and it shouldnt be a problem. Brad Id rather see a full 1-1/2 inches of foam against the concrete.
The best approach would be getting some or all of the foam installed over the rafters so you have a continuous insulation layer. Not sure if it was ever insulated, but I was thinking of applying 1/2 foam (probably Polyiso) directly to the plaster of the interior of the inside walls, then dry-walling or using a new plaster that sticks to foam, over it. Hey todd What type of board would you recommend to lay down on the ground for pex tubing with 2 sand cover this would be below a poly pool used for raising freshwater aquatic life in orlando area of floida. I would have to put 20 2x10s in. We were wondering if we could layer 2 1 sheets of polyiso to get a better r value.The insulation has foil on both sides. Would it be better to use xps against the wall and use the eps (rather than fiberglass) for insulating between the studs? In an existing situation most people would opt to insulate up to these type of utilities. Having said that it really comes down to how much space can you allow for insulation? 3. However, I havent seen much trouble with XPS or Polyiso insulationnot sure bugs would want to eat that! I cant find them anywhere.
Is this temporary fix a feasible solution ? Thank you again. Christine That method actually works quite well. So if I had it sprayed behind and in between studs on the walls and ceiling it would be fine instead of taking down the walls? Todd, first of all thank you for your fast response. You need a minimum of 1-1/2 of XPS foam to seal out water vapor from the concrete.
Two very different things.
I agree that spray foam is probably over the top for this space. Do you think open side of the box (foam side) should have a cover? Other than that I think youve done a pretty good job. You really need to get a couple inches installed if youre hoping to make any improvement in the insulating value. On another note Id love to ask a favor.
Kyle Without seeing the space its hard to recommend a system. Am I correct? The whole area is about 1320. On a conventional wall, you would typically stud it out and run your electrical and plumbing. 
My bedroom over the garage is very cold.
This method of construction is becoming more popular as the price of heat continues to climb. What is the NCR rating in such a situation? I am very glad I found your website! It is a well levelled concrete garage floor. 2. I am located in an uppermost county of Zone 4, just south of Zone 5. House is 2 stories, solid cement with up to 6 thick walls. You can definitely add more to what youve done.
However, your system will probably work fine. At this point should I tear down the existing 1 inch of rigid foam we put up and replace with 2 inches and then install the frame/fibreglass/drywall or can I put up a 2nd layer of 1 inch rigid foam up? Thanks. 1/2 of closed cell foam is NOT going to stop water and I would NOT recommend that approach.
It sure sounds like condensation to me. We removed the chimney penetrations and replace any damaged T&G. I would like to find a high density foam to put on top of slab under floating pergo-type floor. Placing 2 of XPS foam on top of the compacted fill and directly below the slab is definitely a good idea. Also, your attic insulation is way below the recommended minimum for your area. The second part sounds fine. The wall are cement block. I definitely think the 2 blue board is a very good idea. I hope youll become a Newsletter Subscriber and remain a member of our site. If you install the foam between studs in the same plane as electrical boxes youll need to seal them well. I can certainly understand the cramped quarters and not wanting to spend much time up there. My basement seems damp in the summers so I have to run a dehumidifier. 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. Nice and dry and almost totally dust free. Can you explain the project further? We plan on blowing in cellulose for the majority of the house, but would appreciate advice on insulating slab and exterior walls, plus roof (i.e. The posts are 8 oc. They pass water vapor both ways, and they trap water droplets on either side EXTREMELY well. I would just use 24s or if code allows you may be able to use shallow boxes (if they will fit in the 1-1/4 space you have.
Its very similar to what I was thinking of doing with rolls of R-30. Flat roofs are best done with rigid foam above the structural deck and just below the membrane.
I am thinking of insulating the cellar so I can work down there comfortably. 
Eric What you are describing is a hot roof (unvented). Todd, I am reading the posts and they are great!
Im trying to find someone to give me a quote on spraying in insulation in my corners but havent had any luck yet in my area. I was even thinking of using house wrap on top of the foam just to provide the extra barrier for water moving into the wall. Thanks. I am looking for ideas to insulate a cathedral ceiling.
1. So even adding the 3/4 and sealing it would be a big improvement.
I have an old 1920s home with a brick exterior and plaster interior. I dont know if the rolls/batts would want to settle if only stacked 2 high, 3 at the most. Every state has different rules regarding energy codes. The boxes will be stored indoors when not in use. Spray canned foam around seams to the wood rafters best? 
Thanks for your help and suggestions. ft. insulation xps polystyrene fiberglass extruded knauf diy cooler thickness 600mm 50mm 30mm shedheads yeti better materials built versus theory indiamart also water pipes are in the garage cieling near the garage and farther from the kitchen floor above. I am trying to lessen the noise of people walking around on the hardwood floors upstairs while in the basement and was thinking that gluing some foam board insulation in the areas between the joists and then using Great Stuff to seal the cracks along the edges might do something to help. The contractor is offering Procanna siding for the color I want whioh seems to be OEMed from an Ontario siding manufacturer, thickness is .044 and 25 year fade resistance. Seems like going over the foam and using that as the extension would be safer and caulk the underlying furring strips well to keep them from allowing the moisture under the foam from penetrating. The ceiling rafters will be furred out to 12. And to allow for heating ducts, the floor is raised about 14 on 28 joists. 7. Thanks for sharing! It has a ribbed steel exterior, 8 ft spacing between the uprights. Strapping with wood first isnt recommended because of termites. What is the best possible insulation for the exterior wall? 12 inches of water is in my opinion a basement that shouldnt be finished. Do you know about what would it would cost to have 380 square foot sprayed? My boss would love for these things to last a lifetime. I have heard so many conflicting things about insulation that Im ready to do nothing! Will insulating only part of the cellar help? You want the insulation to be as close to the outside as possible. 1.
You should spray it also on the finished side. Relocating or moving them would be a pretty costly task. John Weve done dozens of radiant slabs and every one of them has been done differently based on ever changing recommendations from the HVAC industry. I have an older home in WI that has just had the second floor redone. If so I think I understand the situation.
I am planning to build a room over my attached garage. Also the garage roll up door is metal/aluminum. Sorry I forgot to tell you that I am on the southern Oregon Coast. 5- can isoply be tapered? The dormers are doing to complicate things even further.
First of all your proposed solution is likely not legal. There also appears to be a difference with the type of insulation being used (ie XPS vs polyiso etc). Recently we want to re-roof. Good point! Can you put foam insulation in the garage ceiling over drywall to gain better heat? (Google Tumbleweed Cyprus to get an idea.) Thanks for your advice. 4- He is worried if we do or dont need a house wrap as I also suggested that we could eliminate that if we use the right foam. I am not sure if this is just a selling point or not? You dont have to insulate the floor in order to make a big difference. I believe the moisture is coming from cooking/bathing within the unit itself or from the outside through the concrete, (if this is possible under what situations does this occur?) (The inspector somehow missed that.) Full of information and this will help us a lot. In some spots it is as much as 3/8. What about the walls that are completely above grade? We are building a 2438 detached garage in Illinois and trying to determine the best insulation option for our use and budget. Details: Zone 6 climate. Again, the entire home is concrete block with a sandstone exterior nothing but a conduit for the cold. No grade for this quiz, just everlasting gratitude when Im enjoying my nice dry basement!
Can you give me any assistance on what to use in regards to insulating a metal roof. 300 sq ft)for a studio space (used for yoga)that can be removed in the future to convert back to garage space. 5. Youll likely need to work with your local building code official to work out the fine details. Here is my question. When properly covered from the sun and environment it should last indefinitely.
I know that the correct installation involves laying rigid board with sleepers and subfloor. I poured a concrete slab in the bedrock for the floor with no insulation. Any thoughts on going with a 3/4 or smaller board for this section of wall?
Preferably R49 or above. We do that by attaching Tyvek or Typar to the next truss and then nailing 13 boards over the truss members to help reinforce the building wrap. This sounds like it would be essentially a hot roof which is not uncommon in Canada. Can I use both methods? There is about 2 inches between the roof and the bottom of the supports. So if the thickened slab is a foot below grade, and you have 2 inches of foam under it, youll likely defeat the frost. The better solution is the insulation on top of the roof sheathing or applied to the bottom chord of the trusses so its continuous. Thank you! I have a dehumidifier. Youll want a really good vapor barrier on warm side. My plan was to glue at least 1 1/2 of foam board to the concrete walls, leave 1/2 gap, then frame a wall with R13 fiberglass and cover with drywall. Then we blow that cavity completely full of cellulose of fiberglass. is there take wide enough to span over the rafters? That extra bit really makes a big difference in performance especially in climates with large temperature swings like here in the North East. 3. 
Brian Glad you found the video and article helpful. The depth of insulation depends on your location. Todd, I am remodeling an old farmhouse in Pa. Interesting question! I purchased a steel enclosed trailer and want to add insulation to the inside walls and roofs. House is in New England. Basically you have areas of 3 foam, 1 foam and 2 foam depending on where you calculate it. The problem i ran into is that the rafters are just 26 inch with actual dimensions of 25.5 inch. Dylan, Youre MUCH better off blowing additional loose-fill fiberglass over your existing insulation. Again I am in Wisconsin. I built a conservatory off of the dinning room many years ago with the intent to heat it with a cast iron radiator. (Walls will be rough-cut 6 or 24 with furring strips added inside. Can I install 2 foil backed rigid foam board on top of the wood floor? Thanks D. David No difference.free markets driving price.nothing more. The board can then be snapped. Im building a home close to Houston Tx and have 24 walls, wrapped 100% with 1/2 sheathing and then with 3/4 R Max insulation boards (R-5).
Yes, the top of wall up to the sill plate should also be insulated. The polyiso + closed cell provides R26 protection for the same price theyll charge for 2 of closed cell spray foam..basically double the R value for the same price. I have 26 walls. But just to clarify, does the 2 inch XPS go on top of the footers as well as the gravel or does it go on top of the gravel but level with the top of the visible footer? Something just keeps spooking me about working with the thicker pieces.
Thanks for your help. Would best practice be to: a) put one layer XPS sealed directly against the rim joist (thereby creating an air pocket between the insulation and interior framing) b) put one layer XPS sealed on the edge of the sill plate (thereby creating an air pocket between the insulation and the rim joist) c) double or triple up on the XPS to eliminate any air pocket from rim joist all the way to the edge of the sill plate d) none of the above. By using the steel Z channel fastened to the concrete, isnt there going to be some thermal transfer through the channel creating hot spots where it attaches to the drywall or MGO board? If you install stiff foam board and glue it to the joists I think youre creating a very nice drum. If you dont want to lose much height, then install some of it between the rafters and the last layer over the rafters. Thank you so much!!! Id recommend you read: http://www.homeconstructionimprovement.com/how-to-insulate-basement-walls/, Best of luck and thanks for the compliment. Now my question is, rather than strapping the ISO and adding drywall, could I add some sort of beaded board (cedar, pine, beaded plywood, etc) to cover the ISO for the ceiling rather than using drywall. You really need a proper insulation/vapor barrier between the concrete and framing. The following is what we have. So I only have 1.5 space for insulation. Hi Todd, We just bought an old brick house in Maryland built in 1920. I would like to make a raft with 4 inches of board insulation below both the basement and the footings. Hi, I am building a new house up in Maine and currently the inside is unfinished. Look for coatings that are both UV Blocking and Resistant.
But I found your blog and it seems to me it would be cheaper and better in the long run if we just put r13 or r15 into the cavities and then 1 xps board over the studs. Dylan Can you install it over the fiberglass or are there floor boards over the existing fiberglass? Are there big differences still in vinyl siding from different manufacturers? To get the width that I need. Originally, I was planning on putting up the 3/4 polyiso (which I can easily get at Lowes where they cut it in thirds vertically so it fits in my car..Ive no truck). Here are my plans for insulating my home during a roof tear-off here in Madison, Wisconsin. Thanks for any advice you can offer (this is not really in my bailiwick). At this point it sounds like you need to remove the damaged fiberglass, clean the mold, and start over. Is it a row of brick, air space, sheathing, framing, plaster? Will a hepa vacuum filter work for cleaning up fiberglass particles after Im done removing this garbage? Does anyone have a reason this wouldnt be a good idea? Cost = Cheapest of the foam insulation boards. I think I would need 2 or 3 48 panels to finish it. It is exposed on 3 sides (s,w,n) and currently only has r11. Jazz Ive never heard of them but doesnt mean the product is bad. This 8 gap also allows me to run a fan behind the studs for good air cirulation. Sometimes you do need to apply some temporary shoring but not often with this product.
You can install it several ways. Im in this same boat as you (were), and the options seem limited. Alan Blown in insulation is a great option for attics. The Delta MS is a little bit further away from the wall and this leaves a little gap under the Clad Mate where the Delta is connected to the block wall. The walls are already sealed and has no noticeable moisture issues.
They also state that seams should not be taped (at least in the horizontal position)? These are great comments.
1. Sounds like you have that air space potentially connected to cooler air. If the rigid foam board is put under the Tyvek then Tyvek HouseWrap can be used. They drill small holes in each stud bay from the outside or inside. Karen You have to use a minimum of 1-1/2 of blue board in order for it to act as a proper vapor barrier. I am planning on using foam board for a slightly different approach. It does potentially create an area for condensation as well. Your insight is appreciated. I understand your specialty is cold climate. I have to agree with Todd on this one. Ryan The most important issue is controlling the location of the dew point across the wall section. Do I need house wrap for this?
I planned on just insulating with standard faced fiberglass batts. Thanks Todd. Gary Im not sure thats much of a concern. You have to check with your local building code official. Most building inspectors would definitely require that you cover it, but lots of houses dont. It really should be covered by a siding product. I live in southeast PA. Im planing on finishing my basement. My question is if I insulate the garage roof with foam board, will it help to make the overhead bedroom warm? Can i just sister every second rafter with a 210? Thanks.
If I lived in Alaska Id spend every dollar I could on insulation versus other nice to have things like nice countertops, etc. I do not want to do anything stupid.
Obviously there are times when its no practical. There is sheet plywood nailed over lath and plaster interior wall which I plan to pull off. Your suggestions as very helpful re foam board insulation.
You said you end up using spray foam in cathedral ceilings to get your r-value, do you use another insulation with that? However, they are not sufficient to act as an effective vapor barrier for basements that need to be insulated. 1. Foil faced isnt made for direct contact with concrete. I will keep you posted as the project goes on! Blue board works in almost any application. Before installing the foam board though I would get some samples and test the spray foam on it to be sure theres no reaction that would damage the foam board. There is a Stucco wall outside, a 30 lb felt then drywall nailed to 24s. I assume you want to do something like I did for my workshop: http://www.homeconstructionimprovement.com/insulating-cathedral-ceiling-with-foam-board/. The opposite side of this truss is in the unfinished attic. Good luck.
Todd, another insulate the attic question. Im also not sure about what to do to deal w/ the steel supports.
Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects. The rafters are 2x4s on this 1920s era home and I dont want to lower the height of the room-in-attic ceiling if at all possible. The afternoons and evenings are brutal. I am willing to remove and replace all the siding if I have to but if you have a better idea on how to insulate it without removing the siding, Id love to hear it. It allows misture to move back and forth through the board but protects 24s from contact with damp concrete. Afterward I plan on doing drywall. In order to keep it RV classified/moveable, I have an 86 max width to work with, so Im wondering if a combination of exterior Polyiso boards and sprayed insulation on the interiro 2x4 framing will keep me warm. Todd, I did find a tape equivalent to the tyvek product, and Im going to go w/ that.
I took all the batt down and the pink board looked as though it was sprayed with a garden hose. hydronic In order for that to happen moisture would have to pass through the drywall and paint. I have a similar situation as Karen.
Not being able to pull the trigger about which thickness of polyiso is really bugging me. We dont have to ask questions all over again. What is your opinion on sealing the concrete with Drylok (or something similar)? My house is split level, so half the basement is above ground (already insulated) and half below.
You can use the same methods we use for basements found here: http://www.homeconstructionimprovement.com/how-to-insulate-basement-walls/. Thanks for your time. 3. I have a 1st level room (above grade).
Blown in insulation is cheap and you could even do it yourself. The bottom course of block wall have 1 holes drilled into the cavities so that the walls drain into the weepers.
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