Tag Archives: rodents

Barndominium Closed Cell Spray Foam

Barndominium Closed Cell Spray Foam – and Rodents

Closed cell spray foam applied directly to steel roofing and siding can be a great product for controlling condensation, achieving an air tight barndominium and at R-7 per inch is a great insulation solution. So good, I strongly encourage its use, especially for those buildings in Climate Zones one and two (deep South).

One thing it does not do is to prevent mice, rodents and other similar pests from enjoying your comfortable living spaces.

It’s important to understand what it is inviting critters in to begin with.

Where your barndominium has most air leaks is where rodents, bats and bugs come in through. Usually this is poorly detailed and installed steel trims.

When these pests are looking for a nice, comfortable place to stay, they are going to run along outside barndominium’s exterior until they find an opening. Basically, these rascally little rodents are looking for air movement out of your barndominium. 

If it’s cold outside and your barndominium is leaking heat, a mouse is going to find those leaks and consider it as a warm invitation in!

Seal up any openings where these critters can get into your barndominium, especially if you notice openings in your roof or along wall steel base. Those are issues you’ll want to take care of right away.

Once this is done, adding closed cell spray foam insulation can help.

Spray foam offers no food value to rodents or pests. 

Good thing about closed cell spray foam when it comes to pests is it does help to seal up those cracks and crevices where it is sprayed, making it more difficult for those unwanted guests to get inside. This is because closed cell spray foam creates an air seal keeping inside air where it belongs.

As creatures search for drafts coming from your barndominium, closed cell spray foam’s air barrier leaves nothing for those varmints to find.

Closed cell spray foam insulation is in no way a repellant. As mice, bats, rats, and other pests can chew through wood to get into and out of your barndominium, they can of course chew through closed cell spray foam.

 

Closed cell spray foam insulation in your barndominium can definitely help keep pests out as it provides a defensive layer to keep pests out by blocking those air leaks they are looking for.

Rascally Rodents

Rascally Rodents

Rodents, such as rats and house mice cause serious damage to structures of barndominiums, shop/houses and other buildings. These rascally rodents can cause grief with any structural system – not just post frame buildings. While rodents are notorious for their consumption and contamination of feed, rodent damage to insulation raises heating and cooling bills. Rodent-proof construction is your first and most important step on reducing rodent damage.

To prevent rodent entry, determine if a void is suitable for filling with caulk to stop airflow. If yes, use an appropriate caulk and backing to stop potential airflow through opening. Install a gnaw-resistant barrier over the gap to prevent entry. Recommended would be hardware cloth (wire mesh) 19 gauge. ½ x ½-inch mesh to exclude rats; 24-gauge, ¼ x ¼-inch to exclude mice. For openings less than ¾-inch wide unable to be secured by other means, tightly wedge copper or stainless steel wool into the gap.

Gaps or flaws often exist along building exteriors where wall framing meets foundations or slabs on grade. These gaps or flaws provide easy access to rodents. Rats can burrow beneath a concrete floor or shallow foundation wall. They frequently seek shelter under concrete floors and slabs, where they burrow to seek protection. Ideally install floors, slabs and sidewalks with curtain walls of ¼-inch mesh wire. Placing 18 inches of compacted sharp gravel under slabs helps to discourage rodent burrowing as well.

Wire mesh should be galvanized or stainless steel for longevity and at a significantly lower cost than concrete ‘rat walls’.

Perimeter insulation is a necessary part of energy-efficient construction. Insulation around building exteriors, however, is subject to both mechanical damage and destruction by rodents. Besides wire-mesh protective coverings such as stucco, cement board, high-density fiberglass-reinforced plastics, or surface bonding products may also be used to protect rigid board insulation. Extend protective coverings or mesh at least 36 inches below finished grade, making sure no gaps are present at top or between covering members.

Concerned about burrowing rodents, or if your jurisdiction has a “rat wall” requirement? If so, investing in some wire mesh appears to be a cost effective prevention method.

BIB’s Insulation, In-Ground Posts, and Rodents

BIB’s Insulation, In-Ground Posts, and Rodents

DEAR POLE BARN GURU: I’m still in processing with the county to get permits for our new Hansen home building but in the meantime I’m trying to figure out insulation for our raised floor. County requirements (I’m assuming IBC code) requires R30 floor insulation. The building floor design wound up using 2×6 floor joists so I’m trying to figure out how to get R30 worth of insulation in a 2×6 joist cavity? I’m planning on either BIBS or blown/dense pack cellulose for the walls and ceiling and there’s no problem there, but the floor is an issue. I’d rather continue cellulose or BIBS in the floor but I’m not seeing a clear solution( I can do spray foam if absolutely necessary but I’d really rather not). Do you have any suggestions? LONNIE in COLORADO SPRINGS

DEAR LONNIE: I know you have read my blogs, so you know I am a huge fan of BIBs, having used the system in two of my own buildings. I previously have had some qualms about the use of closed cell spray foam insulation, however my physics teacher son had good results with it in the remodel addition to his home, so we used it when we added the elevator shaft to the rear of our own home and I am now a convert. You can get R-30 with as little as four or so inches of closed cell spray foam and it absolutely seals up everything.

 

 

DEAR POLE BARN GURU: I will be building a post and beam barn (40×48 or thereabout) on my property and would like a central loft that I can finish for additional living space. I have been advised that posts concreted into the ground are unlikely to last but I’m a bit concerned about a two story structure with posts bolted to concrete piers… What would you normally recommend? MIKE in LEXINGTON

DEAR MIKE: Whoever is giving you the information about the lifespan of properly (key word being properly) treated pressure preservative treated columns not lasting, knows not what they are talking about.

I personally own three multistory post frame buildings, including our home which has 8000 finished square feet and a roof peak 44 feet above the ground. Every one of them has treated columns in the ground.

While columns bolted to piers will work in most situations, why go to the expense and extra efforts?

 

DEAR POLE BARN GURU: I was wondering if you had any ingenious ideas about how to keep mice coming in from sliding barn doors? We have stuffed steel wool and sprayed foam into the corrugated hollow sections of the walls but they’re still able to come in through the gaping hole under the sliding door.  Any ideas how to resolve that? MELANIE
carport barnDEAR MELANIE: I always warn people who are planning on using sliding doors – as long as you do not mind your neighbor’s cat getting into your building, they are great. No matter what you do with a sliding door, short of affixing it so it will not open, the mice are going to get in. An adult mouse only needs a hole the size of a dime in order to enter your building. By its nature, the sliding door needs to do one thing to function – slide, and in order to slide it has to have space to be able to clear the members which are under it. If your building does not have a concrete slab on grade floor, you could pour a concrete curb across the door opening, however the bottom of the door will still need to be adjusted up high enough to clear the concrete given the fluctuations in expansion and contraction of both the door and the building due to seasonal changes in temperature and humidity.

If you truly want to eliminate the problem, replace the sliding door with an overhead door. In the meantime, it might behoove you to invest in a good barn cat or two.