Want Draft-Resistant Windows?
Start With These 5 Installer Questions
You’ve picked out beautiful, energy-efficient new windows. But here’s a surprising fact: even the best windows can underperform if they’re not installed properly.
Most drafts, condensation issues, or sticky sashes aren’t because of the window — they’re often the result of how it was installed.
So how do you make sure your window investment delivers the comfort and performance you expect? It starts before the first window comes out of the wall.
Here are 5 smart questions to ask your installer before the work begins.
1. What Will You Do to Ensure a Draft-Resistant Fit?
or Using It Incorrectly
A tight fit matters. A good installer should inspect the rough opening for square, remove old caulking or debris, and ensure the new window isn’t just wedged in.
Pro Tip: Ask if they’ll use shims, low-expanding foam, and air-sealing techniques — not just insulation stuffed in with a putty knife.
2. Do You Follow the Manufacturer’s Installation Guidelines?
Every window product has detailed instructions for installation, often specific to frame type, climate zone, or flashing method.
Why It Matters: Skipping these steps can void the warranty — and lead to future issues. Reputable pros should be comfortable walking you through the process.
3. How Will You Flash and Seal Around the Window?
Flashing isn’t just for roofs. It’s what keeps water out of the walls around your window. If it’s skipped or done wrong, your window could be perfectly square — and still leak.
Look for: Back dams, pan flashing, proper house wrap integration, and tape or sealant details that match your siding type.
4. What’s Your Plan for Insulating the Gaps?
Between the frame and your house framing is a narrow gap — but it’s where big energy losses can happen.
Ask if they use:
Low-expanding spray foam for air-tightness
Backer rod and sealant where movement is expected
Caulk that suits your climate zone (not all are created equal!)
5. Can You Share References or Photos of Similar Installs?
Hire a Pro Who Gets It Right
Every home is unique. Your installer should be able to show photos or client feedback from homes similar to yours — in age, construction type, or even window style.
Trust Factor: The best installers welcome this question. It’s a sign you care about doing things right
⭐ Bonus: Ask These 3 Questions Before Signing the Contract
Can you explain step by step how you will install this window?
How do you handle flashing and sealing?
Do you follow the manufacturer’s install instructions?
Can you show references from past installs in homes like mine?
Draft-Resistant Window Install Checklist
Print this out or screenshot it before your next meeting with a window pro.
□ Is the rough opening inspected for square and level?
□ Will the installer use foam or backer rod, not just fiberglass?
□ Are flashing materials suited to the siding and climate?
□ Is spray foam low-expanding to avoid frame pressure?
□ Does the installer seal both inside and outside gaps?
□ Are trim and casing integrated with the water barrier?
□ Is the window’s nailing fin or flange properly sealed (for new construction)?
✓ Will the installer caulk between the window frame and siding — and which product will they use?
❓ Window Installation FAQ
Choose Windows That Work as Hard as You Do
Kasson & Keller windows are designed for high performance — but they rely on expert installation to shine. That’s why we partner with trusted professionals who know our windows inside and out.
Ask the right questions. Choose the right installer. And enjoy the comfort, energy savings, and beauty your new windows were built to deliver.
