Are vented crawlspaces really a bad idea—and can you actually over-insulate a window frame? The crew gets fired up tackling two topics that refuse to die in building science conversations.

First up is crawlspaces. The boys dig into a bit of U.S. crawlspace history, what vented crawlspaces were originally intended to do, and why they so often fail to perform as hoped. They walk through what crawlspaces should and should not do, and why climate, moisture, and enclosure strategy matter far more than tradition.

Then Steve takes the lead on one of his favorite “dumb ideas”: over-insulating window frames. While improving window performance absolutely matters, the discussion makes the case that, except in very cold climates, obsessing over frame insulation can introduce new water-management risks—and distract from much bigger thermal priorities elsewhere in the enclosure.

Classic UnBuild It: strong opinions, real-world building science, and a reminder to focus effort where it actually moves the performance needle.

Pete’s Resources:

• Building America Solution Center – Crawlspaces
• BSI-115: Crawlspaces – Either In or Out
• LSU La House Crawlspace
• GBA Q&A on Window Frame Insulation
• Pete Yost on Thermal Buck

Can ERVs actually dehumidify a home? And does it ever make sense to use a dehumidifier in a vented crawlspace? Two listener questions spark a lively—and slightly ruthless—discussion that leads to one of Steve’s classic lines: “Suck it up, buttercup!”

The crew digs into how moisture really behaves in dry climates, what ERVs can and cannot do when it comes to latent load management, and why dehumidification strategies that work in one climate can be completely wrong in another. They also unpack the challenges of managing moisture in vented crawlspaces and why adding equipment isn’t always the right answer.

Along the way, the conversation takes an important turn into floodplain construction, with a great discussion—and a must-read resource—on FEMA breakaway walls and how they intersect with moisture management and durability. Plenty of tough love, plenty of building science, and lots of useful takeaways despite the rough ride.

PETE'S RESOURCES:
- "Dealing with Moisture of Construction" (GBA)
- Do ERVs really manage interior sources of moisture? (GBA Q&A)
- "Understanding & Measuring Humidity" (GBA)
- "Household Sources of Moisture" (GBA)
- "Design & Construction for Breakaway Walls" (FEMA)

Windows are one of the most confusing—and consequential—components of a high-performance home. In this episode, the crew takes a deep dive into window and glass selection, aiming to make things clear without letting your eyes glaze over.

The discussion covers dual-pane versus triple-pane insulated glazing units, IGU numbering conventions, and the relatively new i89 coating—including what it means for thermal performance and condensation risk. They also unpack the difference between center-of-glass values and full-window NFRC performance numbers, and why those distinctions matter when making real design decisions.

One gem of a takeaway sums it all up, with Jake quoting Steve: “The windows, the envelope, and the HVAC are one line item.”

Pete’s Resources:

• Cardinal Glass Technical Guide (2025 Version 3.1)
• BA 0402 “Singing the Blues in the Key of Low-E”
• A Review of Advanced Architectural Glazing Technologies
• Efficient Window Coverings

A detailed look at smarter HVAC ducting, better airflow, and what it really takes to manage appliance exhaust and makeup air in high-performance homes.

The boys dive into the how and why behind HVAC duct layout, register placement, and whole-house airflow. They break down how interior design, enclosure performance, and mechanical systems must coordinate—because ducting isn’t just about energy efficiency. Thermal comfort and indoor air quality matter just as much.

They also get into makeup air, kitchen ventilation, and what happens when houses get tighter and appliances get stronger. Lots of building science, lots of clarity, and (of course) a little UBIP chaos.

PETE’S RESOURCES:

• Green Basics – GBA Integrated Design
• Building America – Ducts
• Building Science “The Perfect HVAC”
• ACCA Technical Manuals
• Mechanical Kitchen Ventilation Study
• Makeup Air Systems Example (Fantech)
• IQAir Visual Pro Monitor

What does it really take to grow as a young builder today? Jake and Steve bring in Risinger Build’s Managing Partner, Tim Hill, for a fast-paced, experience-packed conversation full of practical advice for builders looking to level up their craft, business, and mindset.

Jake and Steve give Pete the boot for this one—and for good reason. Tim joins them to share real-world insights on everything from building capital and managing budgets to client communication, niche-building, and avoiding the projects that drain your time and sanity. Across the episode, there are a “baker’s dozen” takeaways that every young builder needs to hear:

1. Build capital each year.
2. Have honest, direct conversations about budgets.
3. Meet clients in person for budget discussions instead of relying on email.
4. Remember that builder or not, you’re in the customer service business.
5. Cost projects accurately, not optimistically.
6. Use the job you’re on to improve the next one.
7. Market your own work and own your story.
8. Don’t take projects just because you feel you have to.
9. Show clients the cool things happening on-site every day—they care more than you think.
10. Think and act like a building professional, not just a carpenter.
11. Trust your gut and say no to the wrong projects or clients.
12. Find your niche instead of trying to be everything to everybody.
13. Don’t let your business consume your entire life.

A ton of wisdom in a single episode—and a must-listen for builders on the rise.

 PETE'S RESOURCES:

1. GBA "Five Cathedral Ceilings That Work:"

2. BSD-149: Unvented Roof Assemblies for All Climates

3. "Convection in Loose-Fill Attic Insulation - Measurements and Numerical Simulations"

Seriously? These 3 clowns are sages? The discussion includes how to select the "right” school. How much should a school include building science compared to learning it on the job? And what about even just the 4 control layers?  And all three of us stand squarely with Steve: if you want to design buildings, get out on the job site first, second, and last over the course of your prep and your years on the job. And then take what you learn at the site to improve the information transfer you accomplish with your drawings!

PETE'S RESOURCES:

• The architecture school Steve went to
• Pete taught for Keene State in building science (briefly)
• ACSA (Assoc of Collegiate Schools of Architecture): cool resource including a Quiz that leads you to schools that reflect what you want out of your architecture education
• NICHE Building Science and Technology Graduate Programs in America
• BuildingScience Newsletter: sign up by scrolling to the very bottom of their home page

All of us in the industry have projects--likely early in our careers--that we just either cringe about or wonder how the heck we got away with that one? The boys wax nostalgic about stories of their naivety over the years, turning them into valuable lessons learned. Actual building topics include spray foam, sill sealer, combining blower door & IR imaging, slab-on-grade insulation, and rainscreens.

PETE'S RESOURCES:

• "Foam-In-Place Insulation: 7 Tips for Getting Injection and Spray Foam Right:"
• "Sources of Household Moisture" (GBA blog)

Installing windows is getting more, not less, complicated. Pete lobbies for a different, more durable, and simpler gasket installation of windows. Steve and Jake weigh in with their insights and challenges to what Pete is up to. And a bonus: with Steve and Jake's help, Pete creates a new word: "Poninions" (Pete crashed the words opinions and positions, and his "friends" just could not let it slide).

PETE'S RESOURCES:

- Pella Steady Set: https://www.pella.com/professionals/steady-set/

- Build Show LIVE 2024 Austin, TX: "Why I am a Wingnut: Real World Testing of Building Materials Including Windows & Their Installation:" https://www.youtube.com/watch?v=xGLbHItOH-Q

- BSI-004: Drainage, Holes and Moderation - https://www.buildingscience.com/documents/insights/bsi-004-drainage-holes-and-moderation

www.santa-fe-products.com/

The boys start with a really cool problem-solving involving a monopoly framing, big overhangs, and thermal bridging. And the follow-up is an excellent question from Western Canada regarding the use of ZIP sheathing with a Class I interior vapor retarder. It's a great discussion involving R-values, air barriers, vapor permeability (including all Classes of vapor retarders), wetting, and drying. Whew! Good thing that Steve had a "great" joke to close this one out...(gag).

 PETE'S RESOURCES:

- GBA: "Calculating Thermal Bridging in a Wood-Framed Building:" 

- BuildingScienceAdvisor: 

- GBA "Can Polyethylene Be Used As An Air Barrier?"

www.mbricotiledecks.com/