Why Some Window Flashing Fails
- Incorrect sequencing of flashing installation resulting in improperly lapped building paper and BCRFM (barrier-coated, reinforced flashing material), often identified as Sisalkraft paper.
- BCRFM paper cut too short or missing.
- Use of improper materials in window flashing such as using cut-up building paper instead of BCRFM paper.
- Omission of butyl sealant bead around bottom and slides of window units between the flange and BCRFM paper.
- Water intrusion into the framing system and living spaces resulting in:
- Dry rot in the wood-framing system.
- Water-strained gypsum board.
- Damaged flooring materials, carpeting and interior furnishings.
Proper Solutions/Construction for Aluminum and Vinyl Window Flashing:
- Installation should be per Uniform Building Code Section 1707(b).
- Use only approved materials.
- Follow window manufacturers' details for installation of flashing materials.
- Follow industry standard details, such as those of the Plastering Information Bureau.
Information provided by Building Analysts, a full-service architectural and engineering firm with many years of experience in construction litigation. Their services include: architectural and structural investigations, repair recommendations, preparation of exhibits and expert testimony. Contact Building Analysts Toll Free at: (800) 352-1497.