Installing an aluminum awning window requires careful preparation and execution to ensure proper sealing, functionality, and longevity. While the process involves multiple steps, key considerations highlighted include ensuring the window sill is level and correctly managing the flashing.
Essential Steps for Installing an Aluminum Awning Window
Proper installation begins with a prepared opening and proceeds through securing and sealing the window. Adhering to manufacturer guidelines and local building codes is always recommended.
1. Prepare the Rough Opening
Before you begin, ensure the rough opening in your wall is clean, free of debris, and adequately sized for your new awning window. The opening should typically be slightly larger than the window frame dimensions to allow for shims and insulation.
2. Level the Window Sill and Prepare the Base
A critical first step for a successful window installation is ensuring a perfectly level base for the window to rest on.
- Inspect the Sill: Examine the bottom of the rough opening (the sill) for any unevenness or damage.
- Leveling: Use a spirit level to check the sill. If it's not level, use shims or adjust the framing to create a perfectly flat and level surface. As noted in the installation process, "our window seal is all level," which is crucial before proceeding. This ensures the window operates correctly and prevents issues like water pooling or structural stress.
3. Apply Flashing and Sealant
Proper flashing and sealant application are vital for preventing water intrusion around the window.
- Sill Pan Flashing: Apply a sloped sill pan flashing to direct any water that gets past the window to the exterior.
- Sealant Bead: Apply a continuous bead of high-quality sealant (e.g., silicone or butyl-based caulk) around the perimeter of the rough opening where the window flange will meet the framing.
4. Install the Aluminum Awning Window
With the opening prepared and sill leveled, the window is ready to be set into place.
- Positioning: Carefully lift the aluminum awning window into the rough opening. Have an assistant ready to help guide it into place.
- Flashing Management: As the window is set, it's paramount to ensure that "the black plastic flashing rolls down the outside of the frame." This specific flashing is typically integrated into the window's design (often part of a nailing flange or integrated weather barrier) and is designed to overlap exterior weather barriers to create a continuous waterproof seal, directing water away from the building envelope.
5. Shim and Secure the Window
Once the window is in the opening, it needs to be properly aligned and secured.
- Plumb and Square: Use a level to check if the window frame is plumb (vertically straight) and square within the opening.
- Shimming: Insert shims between the window frame and the rough opening at the jambs and head, particularly near fastening points. Shims help to fine-tune the window's position and support the frame without distorting it.
- Fastening: Secure the window frame to the rough opening using appropriate screws through the nailing flange or pre-drilled holes, as recommended by the manufacturer. Avoid over-tightening, which can warp the frame.
6. Insulate and Seal the Gaps
After the window is securely fastened, seal any remaining gaps for energy efficiency and weather protection.
- Insulation: Fill the gap between the window frame and the rough opening with low-expansion foam insulation or fiberglass batt insulation. Be careful not to overfill, as this can bow the window frame.
- Exterior Sealing: Apply another bead of sealant along the exterior perimeter of the window frame where it meets the wall cladding, ensuring a watertight seal against the elements.
7. Finish the Interior and Exterior
Complete the installation by applying interior and exterior trim.
- Interior Trim: Install interior casing or trim around the window to cover the shims and insulation, providing a finished look.
- Exterior Trim: Apply exterior trim or siding materials to complete the exterior appearance and protect the flashing and sealants.
By following these steps, with particular attention to leveling the sill and properly managing the integrated flashing, you can ensure a successful and durable installation of your aluminum awning window.
