How to install a PGT casement window: 5 Flawless Stages
Why Proper Installation of Your PGT Casement Window Matters
Properly installing a pgt casement window is a critical process that ensures your investment delivers its promised hurricane protection, energy savings, and security. Here is a quick overview of the process:
Quick Installation Overview:
- Prepare – Gather tools (drill, level, shims, sealant, foam) and inspect the opening.
- Remove – Carefully take out the old window and clean the rough opening.
- Fit – Dry-fit the new PGT window and shim it level, plumb, and square.
- Anchor – Secure with fasteners per PGT’s specifications and NOA requirements.
- Seal – Apply continuous sealant and low-expansion foam for weatherproofing.
- Test – Check operation, locks, and seals before finishing trim work.
The difference between a correct and poor installation is massive. Research shows 95% of customers saw their home value increase after PGT impact window installation, and 43% experienced lower insurance costs. However, poor installation can void warranties, fail building inspections, and compromise the protection you’re paying for.
PGT casement windows are engineered to withstand Florida’s hurricanes using laminated glass with polyvinyl butyral (PVB) interlayers. They are tested to meet strict Florida Building Code requirements, including High Velocity Hurricane Zone (HVHZ) standards. But this engineering is only effective if the window is anchored and sealed correctly.
For coastal homeowners in South Florida, proper installation ensures your family’s safety during a storm, keeps energy bills down, and protects your investment with a valid warranty. Whether you DIY or hire a professional, understanding the correct process is key to making informed decisions.

Simple guide to how to install a pgt casement window terms:
Pre-Installation: Gathering Tools and Preparing the Opening
Proper preparation is key to a smooth PGT casement window installation. Gathering the right tools and prepping the window opening beforehand prevents delays and ensures a professional result.

Essential Tools and Materials for the Job
Before you begin, gather the following essential tools and materials. Safety gloves and protective eyewear are non-negotiable when working with glass and power tools.
You will need a tape measure, a level, a drill, a utility knife, and a caulk gun. For positioning the window, you’ll need shims (wood or composite) to get the window perfectly level, plumb, and square.
For fasteners, use the specific screws or anchors required by PGT’s installation instructions and Notice of Acceptance (NOA) to meet Florida Building Code requirements. You will also need high-quality exterior-grade sealant for weatherproofing and low-expansion foam for insulating gaps. If any accessories are needed, always choose genuine PGT parts to maintain your warranty. For detailed specifications, refer to PGT’s Approvals & Certifications – Installation Tools.
Preparing the Window Opening for a Flawless Fit
A properly prepared opening is critical for the window’s performance. Start by clearing the area inside and out, moving furniture and removing curtains or blinds.
If this is a replacement, remove the old window. Use a utility knife to cut through old paint and caulk, then carefully remove any trim. Once the old window is out, clean the rough opening thoroughly, scraping away all debris, loose paint, and old caulk to ensure a proper seal.
Next, inspect the opening for rot or damage. Florida’s humidity can cause hidden water damage. If you find any rot, moisture, or structural problems, you must repair them before proceeding. Installing a new window in a damaged frame will lead to failure.
Ensure the sill is level and solid. Use your level to check the bottom surface and make any necessary adjustments. Double-check your measurements, comparing the rough opening to the new window’s dimensions. Aim for a 1/2-inch to 3/4-inch gap around the window for shimming and insulation. The maximum shim space should be 1/4 inch around the perimeter; adjust the opening if gaps are larger.
For stucco or concrete construction, common in areas like Boca Raton and Fort Myers, PGT offers box frame windows designed for these walls that don’t require nailing flanges. When anchoring into concrete block, ensure anchors embed into the solid substrate, not just the stucco. Always consult PGT’s instructions for your specific window and construction type. For more on vinyl windows, see our guide on How to Install PGT Vinyl Windows.
How to Install a PGT Casement Window: A Step-by-Step Guide
With the opening prepped and tools at hand, it’s time to install the PGT casement window. This stage requires precision to ensure a perfect fit and secure anchoring.

Dry-Fitting and Shimming for a Perfect Placement
Dry-fitting is a test run to ensure a perfect fit before permanent installation. PGT impact windows are heavy, so you will need at least two people. Carefully lift the window and position it into the opening from the exterior.
The window should be roughly centered with even gaps on all sides. If it’s too tight or loose, re-check your measurements. Never force the window into the opening.
Begin shimming at the bottom of the frame (the sill). Use shims made of a high-compression material to make the window perfectly level, ensuring they fully support the main frame’s depth.
Continue placing shims at the anchor points along the sides and top of the frame. The goal is to make the window level, plumb (vertical), square (90-degree corners), and true (not bowed or twisted). Shims help you achieve perfect alignment even if the rough opening isn’t perfect.
While shimming, test the casement sash by opening and closing it. It should move smoothly without binding. If it drags, adjust the shims until it operates effortlessly. Be careful not to over-shim, which can bow the frame and compromise its integrity. The maximum shim space is 1/4 inch around the perimeter. Use just enough shims for a snug, correct fit.
How to Properly Secure and Anchor a PGT Casement Window
Once the window is perfectly shimmed, it’s time to anchor it. This step is critical for hurricane protection in Florida.
Always follow PGT’s specific installation instructions for your window model, such as the CA-740 series. PGT provides precise specifications for the type, size, and location of fasteners. These details are based on rigorous engineering and testing, not arbitrary guidelines.
In Florida, you must adhere to the Florida Building Code and the Notice of Acceptance (NOA). PGT impact windows are tested to meet extreme conditions, including High Velocity Hurricane Zone (HVHZ) requirements. The Miami-Dade County NOA certifies that the window has passed tests for missile impact and wind pressure, but this certification is only valid if the window is installed exactly as specified.
Use the specified corrosion-resistant screws or anchors, driving them through the pre-drilled frame holes, through the shims, and into the wall’s structural framing. Secure each fastener snugly but do not over-tighten, as this can distort the frame. After each fastener, re-check that the window remains plumb, level, and square.
For impact-resistant models like the CA-740, every fastener is part of a system designed to resist extreme wind and debris impact. Skipping or using incorrect fasteners can lead to catastrophic failure during a storm, void your warranty, and fail building inspections.
This video is a helpful visual guide: 2 of 4 – PGT CA640 / CA740 Casement Window – Installation. For more details, consult our PGT Window Installation Guide. Anchoring is about securing your family’s safety, so take your time and follow all specifications.
The Finishing Touches: Sealing, Insulating, and Testing
With the window anchored, the final steps of sealing, insulating, and testing are crucial. These details ensure your PGT casement window delivers on its promise of hurricane protection, energy efficiency, and comfort.

Best Practices for Sealing and Weatherproofing
Proper sealing creates a protective shield that maintains your home’s thermal envelope, stops drafts, and helps manage energy bills. On the exterior, apply a continuous, smooth bead of high-quality, exterior-grade sealant around the entire perimeter where the frame meets the wall. This seal must be free of gaps to serve as the first line of defense against water and air infiltration.
On the interior, carefully fill the gaps between the window frame and the rough opening with low-expansion foam insulation. This foam expands to fill every space without putting pressure on the frame, which could cause bowing. The foam acts as a thermal insulator and dampens outside noise.
Inspect the factory-installed weatherstripping to ensure it is intact. When closed, the window should form an airtight seal, which is critical for energy efficiency. For aluminum frames, regular cleaning followed by a clear water rinse maintains their appearance. For specific guidance, the Adonized Material Maintenance resource is helpful.
Combining exterior sealant, interior foam, and effective weatherstripping creates an airtight and watertight seal ready for any weather. This comprehensive approach is essential for hurricane protection and year-round comfort in our Boca Raton, Fort Myers, and Palm Beach County service areas.
Ensuring Smooth Operation and Functionality
A well-sealed window must also operate smoothly. This final check ensures everything works as designed.
First, test the crank mechanism by fully opening and closing the sash. The movement should be effortless, without any binding or sticking. Any resistance indicates an issue with shimming or anchoring that needs immediate correction.
The sash should glide open and close with ease, confirming the frame is perfectly plumb, level, and square.
Next, test the multi-point locking system. Engage and disengage the lock multiple times to ensure all points activate smoothly and securely. This is a vital security feature, especially for impact windows.
Perform a thorough visual inspection of the interior and exterior, looking for any gaps or imperfections in the sealant. We pride ourselves on attention to detail.
Finally, reinstall any interior trim to give your new window a finished, professional look. Our team serves homeowners throughout Palm Beach County and beyond, delivering a seamless experience from start to finish. Learn more about our services at PGT Window Installation in Palm Beach.
Maximizing Your Investment: Benefits, Parts, and Pitfalls
A PGT casement window is a significant investment. To maximize its value, it’s important to understand the long-term benefits of proper installation, the common pitfalls to avoid, and the importance of using genuine PGT parts.

How Proper Installation Boosts Energy Efficiency and Security
Correctly installing a PGT casement window open ups numerous benefits. For energy savings, features like Low-E coatings and insulating glass work with an airtight seal to reduce the load on your air conditioner. Since windows can account for 25-30% of home heat loss, proper sealing is essential for lower energy bills. Learn more about more on PGT window composition.
The laminated glass and tight seal also provide noise reduction, cutting outside noise by up to 65%—a major benefit for homes in busy areas.
For security, the tough, laminated glass is a formidable barrier against intruders, making forced entry extremely difficult. In fact, 63% of PGT homeowners report feeling safer after installation.
Of course, achieving true impact resistance is paramount in Florida. A model like the Series “CA-740” Aluminum Casement Window is tested for Large and Small Missile Impact Resistance. This protection is only realized when the window is anchored precisely to PGT specifications and Florida’s High Velocity Hurricane Zone (HVHZ) code. Proper installation also brings financial rewards: 95% of customers saw their home value increase, and 43% experienced lower insurance costs after a code-compliant installation.
Common Mistakes to Avoid During PGT Casement Window Installation
Even experienced DIYers can make costly mistakes. Here are the most common ones to avoid:
- Improper Measurements: Incorrect measurements lead to gaps that are too large or a window that is too tight. Measure multiple times to ensure accuracy.
- Forcing the Window: Never force a window into an opening. This will bow the frame, compromising its integrity and operation.
- Over-tightening Fasteners: Overtightening can warp the frame. Fasteners should be snug, not excessively tight.
- Incorrect Anchoring: This is the most serious mistake. Not following PGT’s fastener specifications (type, size, location) negates the window’s impact rating, voids warranties, and will fail building inspections.
- Poor Sealing: Gaps in sealant or inadequate foam insulation lead to drafts, water intrusion, and poor energy efficiency.
These mistakes can void your PGT warranty and cause you to fail building inspections, which may lead to fines and costly re-installation. Our PGT Impact Window Installation Guide offers more detailed guidance.
Sourcing Genuine PGT Parts and Accessories
For repairs and maintenance, using genuine PGT parts is essential to protect your investment. Source components from authorized PGT distributors or reputable suppliers. The official PGT website has a Resources section to help locate parts and distributors.
Genuine parts are engineered for a perfect fit, ensuring smooth operation and maintaining the window’s performance. PGT uses high-quality materials like stainless steel hardware for longevity in coastal environments. Using non-genuine parts can lead to premature failure and may void your PGT warranty. As a local resource in Fort Myers, Access Doors & Windows can assist with parts and installation questions. Learn more about our expertise with PGT Windows in Fort Myers.
Frequently Asked Questions about PGT Window Installation
Homeowners often have questions about installing PGT windows. Here are answers to some of the most common inquiries.
How long do PGT impact windows last?
With proper installation and basic maintenance, PGT impact windows have a lifespan of 20 to 30 years, and sometimes longer. PGT engineers its windows to withstand Florida’s sun, salt, rain, and hurricanes. Regular cleaning and periodic checks of the weatherstripping and seals will ensure they perform for decades, offering a fantastic return on investment.
Are shutters required with PGT impact windows?
No, you do not need shutters with PGT impact windows. This is a major benefit, eliminating the need to install and store bulky panels. PGT’s WinGuard series and other impact-resistant windows are a complete protection system. They are rigorously tested and carry Florida Product Approval and Miami-Dade County’s Notice of Acceptance (NOA). These windows are designed to withstand hurricane-force winds and debris on their own, providing 24/7 protection with no extra effort.
Can installing PGT windows lower my homeowner’s insurance?
Yes, installing PGT impact windows can lead to significant savings on your homeowner’s insurance. Insurance companies recognize that these windows dramatically reduce the risk of storm damage. According to PGT, 43% of homeowners saw their insurance costs drop after installation. Over the life of the windows, these savings can be substantial.
To qualify for discounts, insurance companies require proof that the windows were installed professionally and meet all Florida Building Code requirements. A licensed installer like Access Doors & Windows provides the necessary documentation. We recommend contacting your insurance provider before installation to ask about their specific discounts. For more on our code-compliant services, explore our PGT window installation services.
Secure Your Home with a Flawless Installation
As we’ve covered, the key to how to install a pgt casement window is precision. Every step, from measuring and shimming to anchoring and sealing, is critical for ensuring your window performs as designed.
A correct installation provides substantial rewards: unparalleled hurricane protection, significant energy savings, improved security, and increased property value. In fact, 95% of customers see a home value increase, and 43% report lower insurance premiums.
However, shortcuts can negate these benefits. An improperly installed window can void your warranty, fail building inspections, and leave your home vulnerable. PGT casement windows, especially impact-resistant models like the CA-740, are precision-engineered to meet Florida’s strictest building codes, including the High Velocity Hurricane Zone. The installation must match that same level of expertise.
This is why a licensed and insured installer is so important. At Access Doors & Windows, we are a USA Military Family-owned business that understands what’s at stake. We specialize in installing hurricane impact-resistant windows and doors across Florida, serving Fort Myers, Deerfield Beach, and communities in Palm Beach, Broward, Lee, Charlotte, Pinellas, Hillsborough, Manatee, and Sarasota Counties. As authorized installers for PGT Windows & Doors and CGI Windows, we are committed to energy-efficient, code-compliant installations with integrity.
Whether you are a confident DIYer or prefer professional service, understanding the proper process helps you make informed decisions. You’ll know what to look for and what standards to expect.
For a professional, code-compliant installation that guarantees peace of mind and protects your investment, we invite you to explore our PGT window installation services. Let us help you secure your home with the flawless installation your PGT casement windows deserve.



