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Castle House Distributors

Insulated Concrete Forms (ICF)

Nudura Insulated Concrete Forms (ICFs) provide you with superior energy efficiency, consistency in performance, and lower utility costs over the lifespan of your home versus traditional building methods like wood.

Ideal for residential, commercial, and institutional construction, INSUL-DECK buildings are not only more comfortable, quieter and super energy efficient, but can also provide safety from hurricane level winds, fire and floods.

Meet U-STUCCO™, the world’s first ‘insulated’ stucco that is revolutionizing the stucco industry with its thermal, water and fire-proofing properties. It’s an ultra-light weight, hydrophobic, high crack and corrosion resistant, UV reflective, ready-to-use powder-mix product.

Building for Future Generations

Disaster Resilient Buildings & Homes

Continuous Insulation

Consistent Performance - Lower Energy Bills

Made from Recycled Materials

Insulated Concrete Forms (ICFs) are the superior alternative to traditional building methods and materials. When you choose ICFs for your home or project, you can rest assured that you’re using the best building solution available today.

Homeowner

You imagine your dream home to be a beautiful, safe, and comfortable place. With the steady rise in energy costs and the effects of climate change, it’s also a smart decision to make sure it’s environmentally friendly and energy-efficient. Thanks to today’s modern materials, your next home can be all this and more.

Build better for your family

Nudura Insulated Concrete Forms (ICFs) provide you with superior energy efficiency, consistency in performance, and lower utility costs over the lifespan of your home versus traditional building methods like wood. This means long-term savings and better value for your dollar.

Homes built with Nudura are also disaster-resilient, offering strength, safety, and durability against extreme weather conditions. Our ICFs even give your architect greater design flexibility, allowing them to build to your specifications

Builders & Developers

Today’s builders face a dynamic industry with tough market conditions. Consumers are demanding more sustainable and energy-efficient homes, while labor costs are rising, and energy code requirements are becoming increasingly strict. Rise to the challenge and maximize your ROI by building with Nudura Insulated Concrete Forms (ICFs). The innovative material is easier and faster to build with than wood, letting you save time and money.

BUILD A BETTER CONSTRUCTION BUSINESS

Boost customer satisfaction and ratings with a safe, reliable, and sustainable home that will keep building owners and homeowners happy and comfortable for years to come. Flat packed and easy to ship, move, and install, Nudura ICFs also allows you to save costs during the construction process.

Architects & Engineers

Designing gorgeous and sustainable buildings that offer superior performance benefits can help your structures leave a lasting impression and positive impact. Insulated Concrete Forms (ICFs) let you do just that while giving you the maximum design flexibility to create the unique structures you envision. Our interlocking blocks can be custom cut to the shape or radius you specify, meaning the only limit to your designs is your imagination.

BUILD BETTER VALUE INTO YOUR STRUCTURES

Give your clients a safe, reliable, and sustainable building that will keep them satisfied and comfortable for years to come.

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LOWER BUILDING COSTS

ICFs are quicker and easier to install than wood framing and take up less space on the job site, saving you labor and other expenses.

FIRE PROTECTION

Non-toxic, fire-retardant expanded polystyrene foam provides a fire protection rating of up to 4 hours.

COMFORTABLE CLIMATE

Improved ventilation for healthier indoor air quality and an environment that’s less susceptible to mold.

SUSTAINABLE DESIGN

Energy-efficient, cost-effective, and sustainable, Nudura is a responsible choice for building an eco-friendly home.

MAXIMIZE TIME

Building year-round is possible with ICFs, even in below-freezing temperatures, so you never have to slow operations.

BUILDING-CODE READY

Meet or exceed energy codes with advanced energy-efficient insulation that creates comfortable temperatures for occupants.

Why build your dream house with Nudura ICF's?

1.

Wind resistance of up to 250 mph (402 kph), equivalent to an F4 tornado.

2.

Steel-reinforced solid concrete cores ranging from 4 inches to 12 inches provide far superior strength and safety compared to wood.

3.

Your home is less likely to contain cold areas as the insulation is continuous around the entire house.

4.

Concrete forms require less maintenance over time, saving you the expense and effort of continuous upkeep.

5.

Our ICFs are made from 100% recycled polypropylene, reducing waste and your home’s carbon footprint. By choosing an alternative to the wood you’re also helping the planet, as wood framing contributes to global deforestation.

6.

Flat packed and easy to install, Nudura ICFs require less labor to install, which can help lower your overall construction costs.

*Information provided by the ICFMA data report.

Nudura ICF vs. Wood Framing

The question is…Why wood you?

Nudura ICF Forms are high-tech industry-leading insulated concrete forms that have proven technologies to make building easier and faster. The Nudura line of ICFs offers innovation that is exclusive to Nudura, which allows builders the ability to build and design structures with greater efficiency.

Offering superior performance when it comes to thermal bridging, resulting in even temperatures throughout your home with reduced drafts and cold spots, ensuring you are comfortable no matter what the temperature is outside by providing Performance Values saving building owners up to *60% in annual energy costs. ICF also acts as an effective sound barrier by dampening sound vibrations from unwanted outside noise, such as traffic, trains, and neighbors.

ICF walls are built with reinforced concrete and fire-retardant Expanded Polystyrene Foam (EPS), providing a fire protection rating of up to 4 hours – 4 times that of a typical wood-frame home.

Nudura ICFs in addition provide greater impact resistance and can be engineered to withstand some of mother nature’s worst, like winds up to 250 mph (402 kph) ensuring that the occupants of the home are safe and secure. Nudura’s concrete embedded multi-purpose roof/ truss anchor system provides greater resistance to wind uplift forces than most other conventional systems. Structural reinforced concrete in a Nudura building offers substantially better durability and typically better results in lower life cycle costs compared to wood structures.

Fire Rating

Nudura

4+ hours

Wood

45 minutes

Comparing Nudura vs wood framing

Comfort and QuietNuduraWood Frames
Calculated R-ValueR-23.59 (RSI 4.16, U-Value 0.24)R-11 to R-19 (RSI 1.94 – 3.35, U-Value 0.52 – 0.30)
Tested R-Value of Wall*R-24.1 (RSI 4.25, U-Value 0.24)R-15.2 (RSI 2.68 and U-alue 0.37)
Reduced Heating & Cooling CostYesNo
Thermal Massup to 75 lbs/sq.ft. (3.59 kPa)2 lbs/sq.ft. (0.10 kPa)
Typical Air Leakage1.11 ACH3.36 ACH
Sound DampeningEffectiveMinimum

*ASTM C-1363 testing per ICFMA/UL(CLEB) Laboratories

Strength and Durability NuduraWood Frames
Bearing Capacity Top of Wall41800 plf (60192 kg/m)*5404 plf (8041 kg/m)**
Wind Capacity250 mph (402 kph)90 mph (145 kph)
Fire Rating4+ hours*45 mins
Flying Debris ProtectionAssuredMinimal
Defends Against Termite & Pest IntrusionYesNo
Interior Finish Nail PopNoYes
Wood Split & WarpNoYes
Risk for Mould Growth & RotNoneHigh Risk

*As per Nudura’s UL/ULC listings. **As per American Wood Council DES230.

Castle House Distributors

What our clients say

Castle House Distributors, Inc. is one of the largest and most trusted suppliers of windows, doors, and insulated concrete forms in Sacramento today. After more than 10 years in the industry, we have made sure that our customers describe us best.

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Madi Sh profile picture
Madi Sh
June 17, 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
The construction suppliers you work with as a construction company are very important. For our company, Richard L. is one of the best examples of how a company should value its customers. Whenever we place an order for windows, doors, or sliding doors, Richard reviews the entire plan and prepares a complete quote. He asks questions about details that others often overlook. If he is not completely sure, he asks for confirmation and even recommends double-checking with the designers. What I appreciate most is his attention to detail and his observations—they are almost always correct. Thanks to his diligence, our construction projects have avoided costly mistakes more than once. That level of professionalism is extremely valuable to us, and my appreciation for his work is endless. We are truly grateful for his dedication, knowledge, and commitment to helping our projects succeed.
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Dan Loesch
June 12, 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
Ben Mitchell is a solid sales rep. Every time I need something unique he has a solution. Would definitely recommend buying doors and windows from them.
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David David profile picture
David David
January 8, 2026
Google star 1Google star 2Google star 3Google star 4Google star 5
I am very impressed and highly satisfied the way this company did my windows . They installed high Quality windows and framed them beautifully. They were quick, kind and respectful. I highly recommend this company.
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Yi Peng Wei profile picture
Yi Peng Wei
November 7, 2025
Google star 1Google star 2Google star 3Google star 4Google star 5
I highly recommend Castle House to someone who wants to get a quote on windows. They are super efficient and the price is pretty nice. Most importantly, they tried their best to help customers find the best suitable products. I live in Santa Clara and the distance is quite far from Sacramento. However, I still highly recommend someone who needs windows to contact them. They are way better than the south bay window dealers. I originally came to Castle House for some high STC rating windows (AMSCO). From my previous experience, I did not expect a reply from a website quote form. But I was wrong, I quickly got responses from them, and the price is the best compared to my previous survey. Later on, they found out that the product I was looking for cannot do re-tro fit and recommended me to another brand of windows (MILGARD). For MILGARD, there are several product lines, and they recommend me the most valuable one. You could pay way more to get 1 point higher STC rating but if you know all the options you probably won’t go for the most expensive one. I am pretty grateful they suggested to me the most valuable one instead of the most expensive one. Besides, I want to mention that my order is quite tiny to them as I only wanted to replace 6 windows for my house, and they still tried their best to address my case. I would like to especially thank Courtney for all her help along the road. She tirelessly addressed all my questions even though my order is actually tiny. She also recommended a pretty nice window installer. Thank you, Courtney.
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Serge E
July 16, 2025
Google star 1Google star 2Google star 3Google star 4Google star 5
Great guys, great price! Shut up and take my money)))
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Clint Summers profile picture
Clint Summers
June 20, 2025
Google star 1Google star 2Google star 3Google star 4Google star 5
Found a hard to find part for a sliding door and got it really quick. Exceptional service and communication. Well run business with spectacular people that do a great job!
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andrey rudey
February 16, 2025
Google star 1Google star 2Google star 3Google star 4Google star 5
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Anatoliy Kalachik profile picture
Anatoliy Kalachik
February 26, 2024
Google star 1Google star 2Google star 3Google star 4Google star 5
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Taryn Passifione
February 24, 2024
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Wonderful service!

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