Do You Need Rim Joist Insulation in Vented Crawl Spaces?

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0:00 Introduction
0:25 Question from Viewer
0:59 Understanding Crawl Space Conditions
3:16 Understanding the Rim Joist
4:54 Air Sealing Rim Joists
6:30 Air Sealing Subfloor
#CrawlSpaceNinja

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Опубликовано:

8 авг 2024

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Комментарии : 37

@chrisdesimone4249 5 месяцев назад

Best hint I have seen... if insulation is dirty, it means air is flowing thru and the insulation becomes an air filter. Foam those gaps

@CrawlSpaceNinja 5 месяцев назад

Nice idea!

@sergii_contractor 8 месяцев назад

Amazing channel Sir, respect! Subscribed!

@CrawlSpaceNinja 8 месяцев назад

Thank you so much.

@ryanf.7933 9 месяцев назад

I've been waiting for this video!

@CrawlSpaceNinja 9 месяцев назад

Hope you enjoyed it! Thanks for watching.

@sjpropertyservices3987 9 месяцев назад

Thank you for another informative video

@CrawlSpaceNinja 9 месяцев назад

So nice of you to say. Thanks for watching.

@gm3908 9 месяцев назад

We recently built a new home and moved in May 5th. Encapsulation was part of the build. I have added the ventilation fan I bought from your DIY store. The rim joists are not air sealed. I am doing that myself. I know you use foam board, but is it ok to pull the rim joist fiberglass insulation, air seal the rim joists, wait for the spay foam to dry and then put the fiberglass back in? Thanks!

@CrawlSpaceNinja 9 месяцев назад

Yes, if the fiberglass is not damaged, you can use it to add more r value. Great question, and thanks for watching.

@user-np2go3vy7t 5 месяцев назад

I live in California and the humidity can get high here. I recently purchase a old house, 1960s build, that did not have any insulation in the walls. This is my first winter in this house. The attic has some insulation, but could be better. I recently got blown in cellulose insulation to the exterior walls in hopes of retaining the heat longer in the house, but it is still drafty, cold and floor are cold as well. I noticed some area of the floor and baseboard has gaps which I filled as well and sealed off small holes and cracks around the house with foam spray. In addition to cold draft and floors during the winter, I have noticed the humidity levels reach around 67% in the home. I am running out of option, but I came across you video. The crawl space is vent and unconditioned. Would sealing the rim joist make a difference in the drafts we are feeling, help with the cold floors and lower the humidity? And when doing the sealing, do I first apply foam spay seal around the rim joist, then put the foam board and then seal again with foam spray? Thanks in advance for your help and great informative videos!!

@CrawlSpaceNinja 4 месяца назад

Hey! To go into this please submit a Ask a Ninja form - crawlspaceninja.com/ask-a-ninja/

@Chris__UU 9 месяцев назад

My crawlspace is encapsulated. For the termite gap, is sealing the exposed brick and mortar with something like "clear" Dylok or Thompson's WaterSeal a good idea? This goes for both inside the crawlspace and or/Outside below the rim joist (I have heard bricks have to breath).

@CrawlSpaceNinja 9 месяцев назад

My concern with any product designed to damp proof is can it eventually grow mold. If the products you are wanting to use will not grow mold and they work, I think it is ok. Most likely top/bottom of brick can breathe plus whatever is behind plastic. Thanks for watching, hope that helps. Also, check with your pest company to ensure they don't have rules that could violate there warranty.

@angkeats3685 8 месяцев назад

I live in Atlantic Canada very humid I blocked my vents off with r10 and put a commercial dehumidifier down there. Which during the summer was great, but now that it is cold 🥶 my rim joist are terribly wet, as well as the frost wall. Any solutions to dry those rim joists out now that it’s cold an so much condensation

@CrawlSpaceNinja 8 месяцев назад

Is the crawl space too cold too turn on the dehumidifier? Does the space have rim joist insulation? If not, could you somehow safely warm the crawl space in order for dehumidifier to turn on the rim joist to dry out then add insulation?

@chaz6645 8 месяцев назад

I am having an encapsulation done on my crawlspace in Little Rock, AR. They are going to seal the crawlspace vents, but they will install one crawlspace vent fan blowing outward to eliminate soil gases. Is rim joist insulation and sealing the sill plate something I might need to do in addition to the encapsulation? Also, should I ask them to seal off any subfloor penetrations as well?

@CrawlSpaceNinja 8 месяцев назад

Glad to hear that they're encapsulating and properly ventilating. We would definitely recommend air sealing and rim joist insulation would be good to have for winter. It will help with the overall comfort in your living space. Check out this video we did that talks about why air sealing is important. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-otNCxKqez8k.html

@seanoramaa 4 месяца назад

Our 1960s Tennessee home has rim joist resting directly on concrete block peers. No sill plate. What is your recommendation for (a) air sealing and insulating with no sill plate and also (b) covering or filling the void at the top of the concrete block (Pests like to live in them. Found a dozen snake skins on 1st inspection of the space, which is maybe better than mice).

@CrawlSpaceNinja 4 месяца назад

To go in-depth it is best for a consultation or a Ask a Ninja form. Here are the links and we are excited to hear from you! - crawlspaceninja.com/ask-a-ninja/

@paulgerton2573 5 месяцев назад

Do we first apply sealant to the rim joist where it meets the wall, then place the foam board and seal it as well?

@CrawlSpaceNinja 5 месяцев назад

Foam Board the use spray foam to seal the seams between the boards!

@jnimitz 7 месяцев назад

My home in Albuquerque, New Mexico has a vented crawlspace that is completely uninsulated, and the walls of the house are cinder block. The climate is very dry year-round (high desert). I'm planning to leave the crawlspace unencapsulated (as an exterior space) and install poly wrapped fiberglass insulation batts between the floor joists on top of the crawlspace. My question is, for the rim joists, is placing some fiberglass enough, or do I need to install foam boards? I'm thinking maybe there isn't much air flow in the cinder block walls. I'm also planning to leave the bare earth floor of the crawlspace - would prefer for any small water leaks to soak in rather than pond on plastic. Does this sound OK? Will appreciate any advice.

@CrawlSpaceNinja 7 месяцев назад

Desert climates are a little out of my comfort zone but the rim joist can allow air to move into the living space no matter the climate if they are not air sealed. I spoke with a man that lives in NV desert and he placed down plastic and sealed it to walls because he was trying to keep desert creatures out. He was not doing it due to moisture. Sorry I don't have a better answer. Thanks for watching.

@jnimitz 7 месяцев назад

Thank you for sharing your thoughts. I appreciate your helpful videos. For my situation maybe someone with experience with a desert climate will be able to add some recommendations. @@CrawlSpaceNinja

@jnimitz Месяц назад

Just an update after 6 months. I decided to go with spray polyurethane foam on the ceiling of the crawlspace (between the joists supporting the floor of the house). Although it cost $6000 for 1100 sq. ft. vs $2000 for fiberglass, it seemed to me much more durable and it seals the surfaces including rim joists against air flow much better. I left the sandy floor of the crawl space unsealed. Now in the hot summer I am finding that the foam insulation did improve the performance of our A/C system - before the insulation our relatively new 5-ton rooftop unit couldn't adequately cool the 2900 sq. ft. house, even though it was sized properly. It could only get it down to maybe 81-82 degrees on very hot days. Now, with the added insulation in the crawl space, the A/C can maintain the house at 79 degrees on very hot days, and this feels much better. So I am satisfied having made this decision. We live in an area known to have radon in the soil, so I also bought a radon meter and discovered that during the winter, with no ventilation, the crawl space had about 6 picocuries/L, and inside the house had about 3 picocuries/L. Although the concern/remediation level inside a home is 4 picocuries/L and we were below this level, this was getting uncomfortably close. I added a small exhaust fan in the wooden access door to the crawlspace, keep it running at a modest level constantly, and it reduced the radon concentrations by half or more. Also open up the house when the weather is good. I hope this info is helpful to others.

@jdawes4403 26 дней назад

How about log cabin construction? How’s that work ?

@CrawlSpaceNinja 22 дня назад

Hey! This would need a In-depth response feel free to submit a Ask a Ninja form - crawlspaceninja.com/crawl-space-help-faq/

@realruggeddiy 9 месяцев назад

I can’t imagine any place in Oregon being that dry. 😮

@CrawlSpaceNinja 9 месяцев назад

I have not been there but I am sure even drier climates will have humidity spikes to deal with at certain times of the year.

@realruggeddiy 9 месяцев назад

@@CrawlSpaceNinja I would be interested in sharing my crawlspace concerns on video with you including your thoughts on outside on the sill plate (concrete to sheathing).

@kingbee4474 9 месяцев назад

@@CrawlSpaceNinjaYou are correct. Even here, in Canada, we have periods where a crawl space gets a RH of 89% in summer. In winter, RH gets low.

@CrawlSpaceNinja 9 месяцев назад

We'd love that! Please fill out our Ask A Ninja form and we can work on scheduling something. crawlspaceninja.com/ask-a-ninja/

@aaronw447 9 месяцев назад

@@CrawlSpaceNinja Depends on the layout of the land and the construction, but the sandier nature of the soil there and low humidity during the summers often permits good drainage to be sufficient for drying crawlspaces. However, dehumidifers are always a good idea during the rainy season, which sometimes feels like it lasts all year long.