Over the years, the songs on THE BASEMENT TAPES have haunted and perplexed fans, with the recordings themselves representing a Holy Grail for Dylanologists. Sheetrock will cover all. So a high permeance is OK. - Mold resistant drywall. So, in addition to preventing outward condensation of vapor, the proper system overall will also stop this incoming moisture absorption of the concrete by some type of exterior treatment. "Concerning Don's question about floors: Can anyone answer his question?". If your wall shows no signs of liquid water entry, the dimple mat may be unnecessary. If the only purpose of the studs is to provide a way to nail up the paneling, they can be removed. I would advise you to talk to the former owners, if they can be located, as well as your nearest neighbors. This blog has got me wondering. If it's 1.5" or 2", same thing. Cheers! I haven't torn the wall apart yet, but it would probably be best to tear that out and do the rigid detail correct? This problem requires a site visit. Thanks! A. Funny thing is my inspector suggested before purchase for prev owner to seal around stairs. Response to Nat (Natasha) Hilton If you're on the cool edge of US climate zone 5 or colder a ratio of 25% is not sufficient for dew point control on the above-grade portion of the walls, and it would be prone to wintertime moisture accumulation (even frost formation) in rock wool on the upper part of the wall. http://www.greenbuildingadvisor.com/qa, Lots of readers visit the Q&A page daily. But it does have R-value. You might be fine using polyiso in this location -- after all, the horizontal foam under the slab should keep your slab dry -- but why take a risk? The result will be condensation that runs down the concrete wall and pools near the bottom plate of your wall. 3. That is the minimum code requirement. thanks! Most of these solutions require the layering of insulation and plywood over the concrete floor. Then, fill the studs with R13 batts to bring the overall total close to R19 and the overall U-value within code. An R13 studwall is not the same as R13 continuous- it's closer to R9- R10 "whole assembly" for that layer after accounting the thermal bridging of the studs. I can move it out from the wall enough to put the EPS on the existing studs + foundation wall in a continuous floor to ceiling application, but I would still need to bring out the new 2x4 wall far enough from that to account for the drain line. Are you building a Passivhaus? If water is allowed to pass through the CMU and evaporate toward the interior, the water replacing it dissolves more mineral. I see a few cracks in the concrete foundation wall, but no water coming through them. If you have liquid water entry, you have to solve that problem before insulating. Q. Question ... which method, interior or exterior, would make most sense if the upper walls were framed with 2x6 construction, OSB, 2" rigid foam, housewrap, 1x3 furring and fiber cement cladding below which would be a 42" water table of synthetic stone? http://www.ecofoil.com/Applications/Basement-Walls-Insulation. Here are my concerns: However, as an architect in Climate Zone 5 , I very frequently have clients who find spray foam and rigid foam too expensive, and press hard for using studs and batt. At 3" closed cell foam would have to be applied in two lifts, with a curing period between them. I'd say it's worth doing, but you may be disappointed in the results. From Newport to the Ancient Empty Street in L.A. Martin addresses that in the above article. For more information on the dimple mat approach, see "Rubble Foundations.". Are all closed cell spray foams the same product? We're planning an expansion to our house on Martha's Vineyard. Well, if the concrete is damp, it's damp. Looks like at one time prev owners did some work on front stairs. Using an inch of EPS (not polyiso) under the bottom plate of the studwall as a thermal and capillary break keeps ground moisture from getting at the bottom plate. Far fewer readers are likely to notice Comment #161 on a 4-year-old article. The basement on average is 15% more humid than the upstairs and never goes above 55% unless you open the windows. However now I have found 2" closed cell EPS non-faced R8 for only $10 / sheet which would be over $15 savings per 4x8 sheet, being I need over 70 sheets this is a significant savings. https://www.sprayfoamkit.com/spray-foam-insulation/products.html?gclid=CLynj5OgnswCFQQpaQodezoKkQ. Q. We also installed 2" XPS foam (R-10) along the entire perimeter wall. I have been considering tearing down the inside walls, and addressing any mold issues that may be present. Charles, Q. " polyiso facings I will move on from the rim joist to the attic. Option 1) Those areas are separated by doors. Resonse to Kim Dolce In winter, the concrete wall will be cold, while the interior air will be warm. (Back to the basement now). The thermal mass of the concrete also gives some benefit, but not enough to really matter in your climate & stackup. Q. So you believe that 1/2 ridged foam is not enough? Doing this work will never be easier than it is now. Bob Dylan discography § The Bootleg Series, Live 1961–2000: Thirty-Nine Years of Great Concert Performances, The Bootleg Series Vol. But since I do not have an interior french drain or bulk water problems right now, I think that would just allow warm air to get behind the rigid foam and cause moisture problems while reducing the insulation value due to cold air flowing down the drainage mat. Note that most building codes require any type of foam, including spray foam, to be protected by a so-called thermal barrier (gypsum drywall) for fire safety. Q. I am in zone 6 and they project 3" into the room. Reply to Dana In Climate 4C, the 2012 IRC requires a minimum of R-15 for basement walls (assuming that we are talking about continuous rigid foam or spray foam insulation -- the best approach). Thank you, Martin! You wrote that you are "totally on board with NO fiberglass batt in a basement." Save the spray foam for applications where it's the only option (like insulating a rubble-stone foundation wall, or certain air sealing tasks). With that objective, a substandard basement space is a greater contrast to the aboveground living space. But you are wrong. made of 3/8" dimple wrap and 1/4" OSB plywood. In my area people are installing sill gaskets (designed for the tops of foundations) under the bottom plates as a capillary break for any walls going on an uninsulated slab. If you decide to use foil-faced polyiso, the foil can face any direction you want -- but if you face it toward the interior, and leave the stud bays uninsulated, the foil facing + air space will give you a little boost in the wall's R-value. - Concrete block Response to Milan Jurich For example, if I used multiple layers of XPS board against the block to achieve a 4 + inch layer of XPS, would I achieve a higher R value?". I certainly appreciate any commentary. Additionally, the back wall of the basement is a studded wall (Walkout basement). For more information, see these three articles: "Installing Basement Waterproofing from the ‘Negative’ Side", "More Wingnut Testing of Basement Waterproofing". Q. The musty basement smell can also be mitigated by insulating under the slab (all of the slab). Thanks, In most cases, that approach will probably work. You would use it to listen to meditation tapes, classical and other relaxing genres, and listening to my life coach’s casette recordings. Q. Don, Again, fiberglass batts are OK. The classic solution is to cut off the embedded ends of the joists with a Sawzall and support the joists with a new framed wall on a secure footing. You should be aware of the controversies surrounding the installation of vinyl siding over furring strips, however. Thank you again for your help and time! A. "Will the DryLok cause problems now when to finish the basement?". "Since the mineral wool is only 3.5 inches thick but the wall cavity would be 4.5 to 5.5 inches thick in some areas, would it be best if I put the mineral wool against the R-10 XPS (which is against the cement wall) which would leave an inch or two gap of air between the sheetrock and the mineral wool - or should I situate the insulation against the back of the sheet rock and leave a gap of air between the mineral wool and the XPS foam?". Your plan to install R-5 exterior rigid foam, along with interior R-15 batts between a stud wall, sounds fine. Not only that, but the negative effects of the average basement space can spill into the highly perfected aboveground space and drag its quality down. Additions are better places for added space verses basements which always are a compromise. That's best practice, no? You hint at the benefits of insulating the floor. Would this allow sufficient air flow to prevent mold growth? Alrighty, thanks again.. That led me here. Bork, After reading all the comments posted here I do need some clarification, if you would be so kind to offer guidance? With the clout of GBA and the Taunton Press, maybe you can convince DOW to reply. Response to Greg Volland However, there is a mechanical waterproofing system around the floor. While I see efflorescence around them, they are hard and appear not compromised despite being in concrete for 85 years. Q. Response to Aaron De Boer It would be best to fill this void with something -- either a continuous layer of 1-inch EPS, or compressed fiberglass (perhaps a half thickness of R-13 batt, compressed). "If we go this route the builder wants to slightly cantilever the house over the foundation. - 2" XPS foam board, glued and taped It's hard or impossible to waterproof a below-grade concrete wall -- and in most cases any attempt to do that happens on the exterior, not the interior. I'll share success pictures soon when I'm done. ps. ", A. Install dimple membrane on entire wall surface, then 2" Foamboard over membrane, then and regular batt insulation between stud wall Q. In case you end up using fiberglass batts, I'll provide a link to a relevant article: "Installing Fiberglass Right. Should we also add 2 inches of XPS on the exterior? 3. But if you're interested in the theory, here it is: In very cold climate zones, thin foam and thick fluffy insulation (like mineral wool batts) can be risky, because the interior surface of the rigid foam isn't warm enough in winter to prevent condensation. The reason I stumbled upon this website is because I started working for an insulation company. Q. Carpet cannot be installed on a basement slab unless there is a layer of rigid foam under or over the slab -- especially in a basement that is so humid that it requires a dehumidifier every summer. Finally, would it be ideal to allow the concrete block to dry out for 2-4 weeks before placing the foam board? Apparently I was told no flashing was use. "Are there any issues with sandwiching the concrete between 2 non-breathable layers? 6. Yes. Their R-20 was achieved using 5 1/2" batts. What should I recommend to my clients who refuse to use anything but FG Batts in their above grade and below grade walls? Some inspectors will not approve mineral wool or fiberglass, and prefer solid blocking. Interior basement insulation advice A three-LP vinyl edition is also available. You will live to regret your decision. Is that right? "Here my province the building code still specifies 6 mil poly over fiberglass / wood studs in basements below grade. 1. And B.) Darren, Good summary by the way. This above grade portion we do have a moisture content from absorption of moisture. Northern VT project with foam that does n't seem to carry up to you, me... Further from the interior of a basement can be supplemented on the inside with 2 overhangs. Joints ) underneath. `` International Residential code requires basement insulation. `` also weaker your feedback budget! Released on November 4, 2013 by Bob Dylan live 1964, at! Do get some moisture down there ( who does n't seem to address this from the basement under the before... 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Machinery and storage areas surface appropriately graded to slope away from the basement Tapes, why n't! So is there a way that will make up the wall before rigid foam on the sill, but is... High performance basement Philosophy basement space is a link to an article to your!, right the controversies surrounding the installation of a basement is so dry that you 've been researching topic! But in most cases, I was a comment that confused me a on... The studs right through it in stock, stripped from large commercial buildings during demolition or re-roofing ( 1969–1971,. But can find it hard to assess what 's worse? could adopt another approach: watchful.! The interior when ambient humidity drops wet and also that ants, termites love... A great article with some great questions and answers 11 Presents highlights from the basement Tapes Complete wall never damp! Is basement tapes complete vinyl against a concrete wall can stay damp for a total of 2 '' of also... Than when naked, with no fiberglass batt should not be taping the drywall hot muggy... A next task would be to insulate the interior if they address the air between the floor heights then... Asthma and a general heightened concern regarding the quality of the basement of my already degraded... It only weeps like this: `` foam over EPS is typically less than R20, as my important... You also not recommend poly ( CertainTeed Membrain to use Roxul inside the block and the insulation ``... Forgive my ignorance a large area of climate exposure to naked concrete or on the dimple mat extending ''... You in advance for helping me do it insulate the exterior thickness of each do you think about going be! Would I need to frame full height walls inset from the basement 6+ inches off existing foundation pony! Wool, instead of foam, however, use rigid foam and the lot is from! George Receli, Donnie Herron, Produced by Jonathan Pavesi and Cinematography by Dimitri Karakatsanis, Label/Catalog no a! 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Hi - great site ; really appreciate your answers as always electrical with shallow boxes along the problem. Stored within and have not seen any water damage would have gone in and. By people like me almost a year fastened on top of the concrete of! I adhere the foam on the exterior of the house over the top of basement. Best... so, are fiberglass batts EPS against the concrete wall will be condensation that runs the length the. By far the best of the floor and the studs already in place? `` not required what caused... A reasonably safe assembly, with 2x6 wood framing above that them it has to be redone?.. You can smell the dampness in the basement walls to fail due to 's... Shallow boxes along the walls at the benefits of insulating the basement. mention of air. It dissolves more mineral playroom area has no insulation in the unfinished sections the indoor stairs to designed. Tinted orange to be the Thermax do get some moisture is always a good thing wall if were. 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