Windows are one of the most common sources of water intrusion in residential and commercial buildings. Without proper waterproofing, moisture can penetrate window boxes, leading to rot, mold, structural damage, and costly repairs. That’s why knowing how to waterproof a window box correctly during construction is essential—especially in high-moisture regions like Louisiana, Florida, Mississippi or Texas.
Why Window Waterproofing Is Critical in Florida Construction
For window waterproofing , special care must be taken when building block structures. Concrete block is naturally porous and can easily wick water through walls if improper materials or installation methods are used. This makes window openings particularly vulnerable to leaks during heavy rain, storms, and prolonged humidity.
Proper window box waterproofing helps:
- Prevent water penetration and moisture intrusion
- Protect framing materials from rot and decay
- Increase the lifespan of windows and surrounding structures
- Meet building code and waterproofing standards
A Contractor’s Guide to Waterproofing Window Boxes in New Construction
The Best Solution for Waterproofing Window Bucks and Concrete
SEMCO Liquid Membrane is an industry-proven solution designed specifically to stop water intrusion through wooden window bucks, concrete, block, and masonry surfaces. Unlike traditional coatings, this advanced waterproofing membrane penetrates deep into the pores of concrete, forming an ultra-flexible, seamless barrier with superior adhesion.
Key Benefits of SEMCO Liquid Membrane
- Deep penetration into concrete and masonry pores
- Ultra-flexible coating that stretches up to 10× its original size without cracking
- Accommodates differential movement between wood, block, metal, and vinyl
- Prevents water intrusion, rot, and long-term wear
- Originally engineered for pools and fountains, ensuring durability under constant water exposure
This flexibility allows the membrane to expand and contract with changing temperatures and building materials—making it ideal for window waterproofing in new construction.
Two-Coat Window Box Waterproofing Process
Waterproofing a window box with Semco’s Liquid Membrane is simple and effective:
- Apply the first coat evenly over the window box, sill, and surrounding surfaces
- Allow approximately one hour of drying time
- Apply the second coat to ensure full coverage and long-lasting protection
This two-coat system creates a seamless waterproof barrier that protects the window opening for years to come.
Why Contractors Are Switching to SEMCO Liquid Membrane
More window installation companies and contractors are choosing Semco’s Liquid Membrane because it delivers long-term waterproofing performance, reduces callbacks, and ensures confidence in every installation.
Try It for Yourself
If you’re looking for a reliable, proven solution for window box waterproofing, try a sample of Semco’s Liquid Membrane today and see why professionals trust it for window waterproofing and new construction projects.
