How To Reseal A Window Fixed =link= -

Stop the Drafts: The DIY Guide to Resealing a Fixed Window

There are few things more frustrating than sitting next to a window on a chilly evening and feeling an invisible stream of cold air hitting your neck. If you have a fixed window (a window that does not open or close), you might assume that it should be airtight. However, over time, the sealant around the frame cracks, shrinks, and pulls away, turning your cozy home into a drafty space.

Resealing a fixed window is one of the most satisfying and cost-effective DIY home maintenance tasks you can tackle. It improves energy efficiency, lowers your heating bills, and prevents water from seeping into your walls. how to reseal a window fixed

Here is your step-by-step guide to fixing that draft for good. Stop the Drafts: The DIY Guide to Resealing

Case C: Resealing a Fixed Casement Window (Crank window stuck shut)

If your “fixed” window is actually a casement window that someone screwed shut because the crank broke, you need to: Case C: Resealing a Fixed Casement Window (Crank

1. Remove the screws.
2. Reseal the moving hardware with silicone grease (not caulk).
3. Replace the operator mechanism. Do not caulk a moving window shut—you will trap moisture and cause rot.

Materials and Tools

• Sealants: Exterior-grade silicone or polyurethane sealant (neutral-cure silicone recommended for glass/metal), or hybrid MS polymer where paintability is needed.
• Backer rod (closed- or open-cell foam) sized for joint depth
• Glazing compound (for older putty-set windows)
• Solvent/cleaner: isopropyl alcohol or manufacturer-recommended solvent
• Caulk gun (for cartridge sealants)
• Utility knife, chisels, glazing tool, putty knife
• Painter’s tape, masking materials
• Rags, gloves, safety glasses
• Heat gun (optional, for old putty softening)
• Measuring tape, straightedge
• Ladder/scaffold as needed
• Replacement IGU (if seal failure inside unit)

5. Common Mistakes to Avoid

• ❌ Sealing over old, wet, or dirty surfaces → premature failure
• ❌ Using interior caulk outside → cracks within months
• ❌ Applying too thin a bead (< ¼ inch) → insufficient adhesion
• ❌ Skipping backer rod in deep gaps → sealant sags and tears
• ❌ Touching silicone with dry finger → poor finish; always wet finger with soapy water

Tools & materials

• Utility knife or razor blade
• Putty knife or scraper
• Painter’s tape
• Caulk gun
• Exterior-grade silicone or polyurethane window sealant (paintable if needed)
• Backer rod (for gaps >1/4")
• Rags and solvent (isopropyl alcohol or mineral spirits per sealant instructions)
• Ladder or step stool (if needed)
• Safety glasses and gloves

Step 3: Tape the Edges (for a clean line)

Apply painter’s tape about 1/8 inch away from the joint on both the window frame and the wall/siding. This step is optional but recommended for a professional, sharp finish.