★★★★★
"We saw a noticeable drop in our utility bills right away. The insulation upgrade paid for itself faster than we expected."— Ray Jackson
Energy-Efficient SPRAY FOAM
SPRAY FOAM
INSULATION
For Homes, Shops, Barns, and Commercial Buildings
About Us
Long-Lasting Insulation for Efficiency, Comfort, and Peace & Quiet
JNB Builders Inc. is a family-owned spray foam insulation company based in Kooskia, Idaho. We proudly serve homeowners, farmers, businesses, and contractors across Idaho, Washington, and Oregon with honest, high-quality work.
With years of experience, we deliver personalized insulation and coating solutions tailored to your project — whether a mountain home, livestock barn, food cellar, or commercial space. We use premium materials, focus on detail, and prioritize your satisfaction. As an owner-operated business, you get direct, friendly service from start to finish.
20+
Years of experience
Family-Owned
Built on family values and hands-on expertise.
Spray Foam Insulation & Coating Services
CLOSED CELL FOAM
Boost your building's efficiency and protection with closed-cell spray foam. It seals out air, locks out moisture, strengthens your structure, and delivers long-term energy savings you can feel.
OPEN CELL FOAM
Improve comfort and quiet in your home with open cell spray foam. It expands to fill every gap, delivers excellent sound control, enhances energy efficiency, and creates a softer, more comfortable indoor environment.
POLYUREA ROOF COATING
Protect your roof with a seamless polyurea coating that stops leaks, resists UV damage, and extends the life of your building. It cures fast, bonds strong, and delivers long-lasting durability you can count on.
FIRE-RATED PAINT
Protect your structure with fire rated paint that slows heat spread, boosts safety, and adds a durable protective finish. It's a smart upgrade that helps safeguard your building when it matters most.
SILICONE ROOF COATING
Restore and protect your roof with a seamless silicone coating that stops leaks, reflects heat, and extends the life of your building. It delivers long-lasting performance and keeps your roof resilient year after year.
INSULATION VACUUM
Clear out old insulation fast with our professional insulation vacuum service. We remove debris, damaged material, and contaminants to prep your space for clean, efficient, high-performance insulation.
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Real Results From Real Projects
See how our team delivers insulation work that looks sharp, performs exceptionally, and makes an immediate difference in comfort and energy efficiency. Every project reflects our commitment to detail, honesty, and long-lasting results.
What Homeowners & Contractors Experience
- Lower utility bills — Many clients notice reduced heating and cooling costs within the first month.
- Cleaner, quieter spaces — Spray foam seals drafts, reduces noise, and creates a more comfortable environment year-round.
- Professional, respectful crews — We show up on time, communicate clearly, and leave every job site cleaner than we found it.
- Work done right the first time — Contractors trust us because our installs are consistent, efficient, and built to last.
Clean Installs,
Happy Clients
See how our trusted team delivers smooth, efficient spray foam work that boosts comfort and leaves every project looking its best.
Review Us On Google★★★★★
"Jared and his crew exceeded my expectations. They were timely and professional. Their finished product was excellent. I highly recommend you give them a try!"— Emily S.
★★★★★
"JNB Builders insulated our new home, and the results exceeded our expectations. The crew was respectful, on time, and explained every step. Our heating bill dropped noticeably within the first month."— Jake Smith
★★★★★
"As a general contractor, I rely on subs who show up and deliver quality. JNB Builders is one of the best. Their spray foam work is clean, efficient, and always done right the first time."— Alice Johnson
Frequently Asked Questions
What is spray foam insulation?
Spray foam insulation is a high-performance insulation material that expands on contact to create an airtight seal. It helps improve energy efficiency, reduce drafts, and enhance indoor comfort.
What's the difference between open-cell and closed-cell spray foam?
Open-cell is softer, more flexible, and great for interior walls and sound control. Closed-cell is denser, more rigid, and offers a higher R-value, making it ideal for exterior walls, roofs, and areas exposed to moisture.
How long does spray foam insulation last?
Spray foam can last the lifetime of the structure when installed correctly. It doesn't sag, settle, or degrade like traditional insulation materials.
Is spray foam insulation safe?
Yes. Once cured, spray foam is non-toxic and safe for homes and businesses. JNB Builders follows all industry safety standards during installation.
How long does installation take?
Most projects can be completed in one day, depending on the size and complexity of the space.
Do you offer free estimates?
Yes! We provide free on-site evaluations so you know exactly what to expect — no hidden fees.