Saved me from making the fiberglass in the floor mistake. The cheapest was $6,700 that was with a sub pump and the stabling of main bean. Crawl will be air tight. Builders love crawl space foundations because theyre quick and inexpensive to build. Then use either spray foam (2-part closed-cell foam) or rigid foam to insulate between the joists to R-12 or so. Im trying not to spend $12,000. If there arent batts that perfectly fit between your joists, then opt for a larger size so you can cut it down. My question is would you replace the CS ceiling with OSB/plywood and the R-19 insulation being such a high ceiling in the CS (making it more like finished space) or attach the rigid foam insulation? As a follow-up, do you typically fasten the vapor barrier directly to the foam board, to the foundation wall above the foam board, or somewhere else? Is this upgrade worth it or a waste of money and I should stay with the 2. Its so bad that even at 60 degrees outside, we have to wear sweaters. I could have contractor #1 install the vapor barrier and have contractor #2 do the insulation but I really wanted to use 1 contractor. Im so afraid.
The house is brick and around the exterior walls (brick) there are block support piers about every 8 foot, so they stick out either 6 or 8 from the brick. With a new baby and everything going on with our move I didnt pay too much attention to our crawl space until Fall. Have a heavy-duty moisture barrier installed over the basements dirt floor, sealed to the walls & the concrete floor. With an old farmhouse, this may also mean improving exterior conditions to drain roof runoff and surface water away from the house. Many condos were built just like yours. The 2nd contractor provided an estimate for both vapor barrier and spray foam insulation on the wall and rim joist. All existing fiberglass has been removed and damaged wood replaced. My wife is leaning in a green direction for mold remediation and plans to use a tea tree oil treatment.
Unfortunately, a recent inspection revealed that there was mold growing on the joist that were insulated by this method. Tim I have a complicated problem. I have forwarded them to our DIY Specialists to email you. You didnt mention whether your radiant heat tubing will be installed on top of the floor sheathing or stapled to the underside of the sheathing, running between joists in the crawl space. Claire: You have several options for improving comfort and cutting your heating costs. Congratulations on the historic house purchase. Tim, I have a weird situationpartial basement with crawl space adjoining it. Do you have a recommendation for that type of product? I have a situation with a 1930 home in Savannah, Ga. I started installing a white 6 mil vapor barrier on the ground. See my earlier comment about XPS & polyurethane foam board. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Install a poly moisture barrier over the dirt floor, taking care to tape all seams, and to tape the poly to your wall insulation. Some installers use a foam board adhesive while others attach the foam board using screws or masonry nails. Heat moves from more to less, and the less in this case will be the bedrock floor and concrete walls of the crawl space. Contractor #1 provided an estimate for a proprietary vapor barrier that was the equivalent of 15mil thickness. Foam Board on first, and then the ground vapor barrier up foam a few inches? 1. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Should I also insulate the metal ductwork? If I understand your advice correctlyyou are saying first use a 1 part spray foam Great Stuff (is this specifically called 1 part?) So Ive only just learned that adding the plastic to the underside of the floor is bad for trapping moisture with the fiberglass. See my replies to other comments regarding recommendations for treating crawl spaces that open into basements. What can we do?? Whatever treatment you choose, make sure that it includes air-sealing & insulating the rim joist as well as foundation walls, sealing vents, and installing a moisture barrier over the CS floor. However, it would be wise to create some drainage & drying space beneath new, fully sealed, continuous floor moisture barrier youre going to install. Since adhesives can fail over time, we recommend screws or nails. Finally, air-seal and insulate the rim joist. Any tips and ideas appreciated. Im looking to use liquids, glues, caulks etc to fasten everything together. Hi Tim; Im replying with Kathys question because its a related topic. What would you suggest for insulating walls or some kind of insulation with no rotting wood effect?
I have a few questions: Consider installing flood vents in all your vent openings. Spray additional expanding foam insulation in any other breaks in the thermal barrier, such as around cable or pipe entrances. These were built in 1986. John: Dont remove the sand; it will help protect the vapor barrier from rocks in the soil that might puncture the barrier. CAN I GLUE THE RIGID INSULATION DIRECTLY TO THE SUBFLOR FROM Rigid foam is inert and permanent; it wont degrade, lose R-value, compress or displace like fibrous insulation can. We use cookies to make wikiHow great. Do you think we should attempt this project ourselves or have a professional do the work? At some future time, you may need to open up the floor and do more insulating & sealing. Replace the flexduct with sheet metal ductwork thats up off the ground and can be sealed and insulated. Make sure to cover crawl space vents with airtight covers so that you isolate crawl space air.
3. Theres a gas furnace (split system) in the crawl space, so Im concerned about fully encapsulating the C.S. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Now for the important part.
Either closed-cell SPF or rigid foam will work to insulate your crawl space walls. The key to success here is to use compatible products tape, foam, poly VB. Finally, upgrade your access door so that its airtight (use weatherstripping where the door frame meets stop molding) and insulated with the same rigid foam.
But if the bare concrete walls are still exposed (and sucking heat from your living space), I would insulate the basement walls before doing more in your crawl spaces. So the added expense of a poly sheet barrier is not necessary. Hi Charles, By using our site, you agree to our. My crawlspace has a dirt floor and is unvented. Theres a small sump pump, but I dont think there is any perimeter drainage. Use a straightedge as a guide if you want to make your cuts perfectly straight. squares of 1/4-in.
Also evidence of mice dwelling in insulation. I live in cold NJ in a 1940 balloon framed two story house. Be careful working around mold, especially within the confines of a crawl space. My question is that when placing down a vapor barrier on the dirt ground where does this align with the ridged foam board? Good luck.
Yes there is standard vapor barrier on the crawl space floors and up the walls. You might also want to install a dimpled drainage mat like Delta -MS from Cosella-Dorken. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website.
Hi Tim, Great article. Consequently, you want your thermal & pressure boundary to be the crawl space floor assembly. Whatever method you choose, make sure it will last and consult a professional if needed to help you decide. Thank you. Learn aboutCrawl Space Ninja Franchiseopportunities. Oddly the floor in the CS is sand (like they intended to pour concrete) and the ceiling has a 3/4 OSB top and R-19 insulation in between each floor joist of the master bath floor above. One of the issues I have is the access point which is just beg enough for a person to enter through an access under the washing machine (yes, we do not go in the crawl at all). Not sure about what is meant by galvanized entry tub. or do i have to do both? Alternatively, you could let the pump drain into a sump pump in the crawl space. It would be nice to have warm floors. The first thing I would do is use canned spray foam to fill & seal all penetrations in the floor to bring wiring, plumbing & ductwork into the living space. 5. The crawl space is vented to the outside without mechanical assists.
I was thinking that an unfaced fiberglass batt insulation to fill the cavity and then 2 layers of rigid polyiso (for 4 inch thickness) would be a good means to insulate. Thanks in advance for your time in addressing my questions. I havent seen a better system for keeping basements and crawl spaces dry than theirs.
The previous owner utilized base board heating for the house and heated the crawl with 2 fin tubes to provide protection from pipes freezing. Tim, Have you ever run into ANTS in a crawl space? I was going to encapsulate the floor, up the walls and around posts. These are also separate HVAC zones and I am concerned about thermal loss. One option is to dig a trench around the outside of the foundation and insulate the exterior walls with 2-in.-thick extruded polystyrene. Thanks. PROBLEM: Crawl space opens into basement. of headroom in your living space, this insulation treatment will be less costly than crawl space insulation. What do you think? In a flood zone, conventional encapsulation is not usually recommended because a storm surge exerts too much pressure against the foundation. They would also tap into my HVAC system and that is how I would have the air conditioned for the space. You were smart to remove the scrap wood because it attracts termites. can cause negative health effects in people, plants, and The crawl is vented- its about 22 to 34 throughout it. Neither of us have done any real home improvements outside of painting and laying floor tiles. What about insulating the floor (basement ceiling) and walls? plywood will make a good door. What is the best way to insulate a crawl space with a dirt floor? I have a 1925 log house in Finland (http://villainkeri.com/wp-content/uploads/2014/01/Winter.jpg) that has an earth floor underneath. Leave the ceiling open. Run the plastic up the exterior walls about a foot. Each sheet is generally 8 feet long by 4 feet wide, or 32 square feet. Fiberglass batts wont stop air movement, so any cold air that gets into your crawl space has a good chance of moving upstairs. Unfortunately, leaving the crawl space as it is will lead to problems with mold and wood rot, not to mention poor energy performance. But if its still cold upstairs, consider replacing old basement windows or installing basement wall insulation before insulating the CS floors. If the ground is level and you can get the foam board to the ground that is great ONLY if you are using ground contact foam board. A French drain thats installed below the footing will definitely capture groundwater at a lower point that the WaterGuard system will. This is a universal recommendation except when a house is located in a flood zone, where flood waters are likely to rise to first floor level. Youve got the classic warm climate moisture problem in a crawl space.
Use a pair of wire cutters if needed. So Id use p-t lumber to frame crawl space walls, and finish with Hardiboard panels as you suggest. You didnt mention whether or not the rim joist has been sealed and insulated. I found this in the kitchen when I gutted it and its just tacked to the sheathing and crumbles easily when touched.
But keep in mind it will flood. We try to stay clear of covering the entire sub-floor with insulation because we are typically closing crawl spaces. http://villainkeri.com/wp-content/uploads/2014/01/Winter.jpg, http://rodenhouse-inc.com/products/plasti-grip-pmf-plastic-masonry-fastener/, http://thehistoryoflindbergincredibleglasse.blogspot.com/, Covering Basement Crawl Space Floor With Plastic Vapor Barrier : JayGaulard.com Blog, Crawl Space Cleanout Seattle - Crawl Pros. Once the crawl space is dry, you can stop running the dehumidifier. Also should the vapor barrier go on the inside of foam board against brick or on the outside of foam board? You may need to cut the insulation so it fits around any pipes or wiring. Good luck. Your situation illustrates another disadvantage of insulating the crawl space ceiling: The insulation and OSB concealed a leak that could have been detected & corrected if the ceiling was open. I live in the Chicago land NW area- my house is a old 1955 cottage converted into a 2,600 home.
This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2022 wikiHow, Inc. All rights reserved. You can also apply spray foam insulation to seal the gaps in your crawl space if you want. Then install a layer of rigid foam (foil-faced polyiso board, 1 to 2 in. I have access to a dehumidifier with a 40 foot hose, which I will run once the space is inspected and encapsulated. will that be ok to sit on top of the poly. Id recommend fully encapsulating your crawl space. Instead of using a dehumidifier with a reservoir that requires regular emptying, I suggest one equipped with small pump that will automatically pump your condensate to the exterior. Its worth studying the aspects of encapsulation so that you can be sure the process is completed correctly. Should I cut up some of the foam board insulation and fit them into the space?
Read more Not sure what my best otions are for my situation. SPF is more expensive, but its very effective insulation (R-6 or more per in.) An associated issue: how you will you empty the dehumidifier if its installed in the crawl space? How does one know what is right? 2) do you have any suggestions for providing fresh air to the furnace? If theres a CleanSpace dealer in your area, thats an excellent place to start. Our crawlspace floor is our basement ceiling. Foundation wall insulation comes in several forms. At the same time remove any soil overburden from the granite bedrock under the cottage. Contact us if you need help fixing yourcrawl space,basement, oryard drainagebyclicking here. Can I obtain an R-19 with 2-3 of rigid foam and 12 air space? I recommend joining the bricks together with construction adhesive rather than traditional mortar. or 2-in. Determine the square footage and add 10-percent. or 1-in. Thanks.
This will hopefully prevent any standing water. Make sure to air-seal the penetrations where duct boots go up through the floor, and seal the new ductwork so that you dont have crawl space air being pulled up into the house. Thank you for that info!
Any help appreciated. My wife and I bought our first home, a front-to-back split level (built in 1955) on Long Island, NY last summer. Am I correct in assuming encapsulation applies here too? sorry for the long post, but I wanted to be clear. Im assuming that I should insulate the stud cavity before applying the rigid insulation to the crawl space side of the studs. I have 24 X 24 crawl space with wood foundation walls about 4 high. Drafty homes are homes with little to no air sealing. Recently we noticed problems with mold growth in one of the front rooms. When the crawl space is open or vented it is also open to moisture, high humidity and whatever nature throws at it.
It should stay fairly dry, because youve isolated it from exterior & ground conditions. The crawlspace floor is fine gravel and sand or such. My concern is the way the insulation is held up. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Hi Charlie & Marlin, The best way to insulate your crawl space and the rest of your home is a combination of air sealing and thermal breaks. Then, a specially trained and licensed remediation expert will remove the Last Updated: May 4, 2021 Did not see any leaks from above. Tim, Do you think I could be creating a moisture problem that would effect the hardwood flooring? It has a concrete floor and one sump pit improperly dug only 1 foot deep with no bottom and a second crock installed with no sump. Lay down a thick (6mil minimum) vapor barrier over the sand after leveling and tamping it. But with cinder block piers, youll have to go to the expense of constructing solid walls before encapsulation can begin. A vented crawl space (above) often has falling fiberglass insulation and moisture problems.
Read more John: Your friends are right about summer moisture problems. Any drain located in the mud zone, at this lower level, will be more prone to clogging with silt over time. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2022 wikiHow, Inc. All rights reserved. Stone foundation walls are good candidates for spray foam insulation, because the irregular surface makes it difficult to install rigid foam panels. You can run the rigid foam right over the vent openings so that theyre sealed off as well.
Its a dirt or mainly mud space always damp-always- it has gotten 20 deg down there but only when it gets 10 or lower for several days which that seems to keep happeningI have insulated my water pipes but the heat duct are un insulated and only cold air seems to come out when the heat kicks onI understand the reason is nothing is insulated under the house- thickness. Is the dehumidifier a necessity when the rim joists on the back side of the space open to the basement for air passage? Good luck. 5. Also, is there anyone pipe insulation material that is better to use over another? Would it be possible to using closed cell spray foam in this case to insulate under the concrete slab? Have I just been lucky in terms of damp, mold, mildew, and should I seal/insulate CS walls, or is it best to leave it for another 40 years, venting as described above? This crawl space is accessible from an existing basement window. On top of the brick, you can bed a pressure-treated 2x sill in construction adhesive; this will form the bottom of your door frame, which will require a weatherstripped, airtight door that can simply be screwed in place on the 2x frame. I would then open these vents in the summer months. Most insulation installed in homes built today do very little to air seal or reduce drafts. Insulation.
Dont install insulation while theres still moisture in your crawl space since it could easily develop mold. I have worked storm claims / flood claims for insurance companies and I have seen my share of wet insulation after a flood.
I cant afford anything else at this time such as sumps in the crawl space. If there are still parts of your floor (above the crawl space) that are cold, this tells you that more insulation or air sealing is necessary somewhere. Do you see any problems with this plan?
You definitely want to encapsulate the crawl space. Address your water issues first, then address the encapsulation.
Four open vents, two on each side of the crawlspace. The rim joist area is sure to be very leaky, so seal and insulate this perimeter zone as described elsewhere in these comments. My problem now is that I am at risk for a frozen pipe in the crawl space because the 2 fin tubes are no longer functioning because I dismantled the base board heating system. Yes, youve been lucky. Hold an end of the plastic sheeting against the far end of the first crawl space wall. Installed against crawl space walls, rigid foam insulation wont degrade or fall out of place. Adhere the plastic to the next, and each remaining wall, following the same procedures. Id favor this approach over building a solid wall. If the fiberglass insulation is in good condition (not compressed, wet or inhabited by mice), its usually OK to leave it in place. This is a substantial amount of work, so you might consider contacting a CleanSpace dealer in your area before going totally DIY. If your crawl space already has moldy, damp wood, youll need to run a dehumidifier after sealing the space to dry out the space. New construction presents insulating opportunities that arent easily available with retrofits. With balloon framing, the stud bays you see in the crawl space or basement extend all the way to the attic. Great advice, I really appreciate it. Read the blogs on stack effect; this will explain how negative pressure created by escaping heated air upstairs tends to suck outside air into a crawl space or basement. The more research I do, the more Im finding that its better to seal both foundation vents and encapsulate my CS. Very interesting and informative page this is. In the meantime, do what you can outside the house to direct roof runoff and ground water away from the foundation.
My original thinking was encapsulation because it has been relatively dry down there, as far as I know. I did not have a proper perimeter drainage but that is done now as well. This will get him back to having hot air rather than cool/warmish air trying to heat his home. See how the house performs after you make these improvements, and go from there. Above all, dont apply closed-cell foam between the floor joists before drying out the basement, because this can actually trap moisture in your framing and make the mold invasion more severe. Scott: If you want to keep using the crawl space ceiling as your thermal & pressure barrier, keep the fiberglass insulation in place. Savannah is a beautiful city and it sounds like you have an historic house that is worth caring for. Thanks for the crawl space insulation tips! Lowering the humidity of the space (and drying out the wood) is the only way to avoid additional mold problems. Closed crawl spaces keep cold and hot air out.
The contractor will need to seal openings that are providing access to your basement & crawl space.
In drought periods, the soil pulls away from the foundation, and thus it seems not to create excessive pressure when wet. But focusing on air sealing major sub-floor gaps is recommended whether your crawl space is open or closed. or 2-in.-thick rigid foam insulation up against the bottom edges of your floor joists (I recommend foil-faced polyiso foam board, which is more expensive but has higher R-value and a radiant barrier). What do you think about leaving the floor insulation and then sealing the brick crawlspace walls with rigid. You can buy insulation batts from your local hardware or home improvement store. If its the latter, Im guessing that your contractor will recommend installing a radiant barrier beneath the tubing, to help reflect heat up toward your living space.
Mike: With your crawl space ceiling insulated, youve established the thermal boundary at the bottom of your living space. Insulate and air-seal the rim joist. Any advise on that front before I pull the trigger? Good luck.
My pipes never freeze. Yes, its a dirt floor but it already has a plastic vapor barrier. Youll definitely want to fully encapsulate the crawl space, with moisture barriers on the floor and walls, well sealed to each other. You may not like my answer because its an expensive one, but given your situation, its what Id recommend. 
Since adhesives can fail over time, we recommend screws or nails. May 6, and we got nearly a foot of snow today. I would definitely remove the old fiberglass insulation. Are you looking to air seal or create a thermal break or both? Hi Tim, question for ya. I live in a house built in the late 1930s. 
What should I do about the basement? But it would make termite inspection/treatment impossible without tearout. By your description Im going to guess that the window openings are small and your basement wont need natural light if its not going to be used frequently. If the contractor can get the two hoses through the access opening and into the crawl space, hell be able to coat the interior crawl space walls with 2-3 in. Perhaps you'd like to tackle your own crawl space repair. The better strategy would be to install 2 in. But the contractor seems to think that its unsafe and unhealthy to have this nasty crawl space open to the basement. Rich: No need to apologize for the long description; these details help.
Expansive clay soil can wreak havoc on a foundation regardless of insulation status. Building scientists stress the importance of aligning the thermal, moisture and air barriers. You might consider framing a p.t. Single story home of about a bit over 1000 sq. I have had someone from basementsystems come out and he said that with a cement floor it can be treated like a basement and not a crawlspace.
I was reading through your post and the replies but didnt see a condition like we have described. Also, are the open seams and holes (allowing pass-through of pipes) in the foam board sealed? Hi Dwight, all great questions. Remove the old, dirty fiberglass insulation. When rigid foam insulation (extruded polystyrene, foil-faced polyiso board or SilverGlo are better than white EPS board) is installed against the crawl space walls (on the interior), joints between boards can be taped to create an air and moisture barrier in addition to a thermal barrier.
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