Exterior Waterproofing
Exterior walls act as the primary barrier against rain and spray. A continuous moisture barrier behind siding keeps water from soaking structural components. Any penetration must be flashed and sealed to preserve the barrier.
Modern exterior systems rely on a drainage plane and a waterproof membrane. The membrane should extend beyond the sheathing and integrate with flashing around openings. Regular inspections help prevent unseen leaks that migrate behind finishes.
In kitchen zones, the exhaust vent can stress the barrier. Proper flashing around the duct, plus a weatherproof hood exterior, reduces water entry. During kitchen hood replacement, verify that the duct opening remains protected by flashing and sealant.
Select materials compatible with your substrate, such as metal flashing on masonry or vinyl flashing on siding. Sealants should bond well with both the substrate and the membrane. When installed correctly, the area stays dry through heavy rains and seasonal shifts.
Hood Penetration Details
Kitchen hood replacement requires careful planning of the vent path. Measure duct diameter and select a through wall or roof route that fits the space. The goal is a direct, well-supported path that minimizes water entry around the wall.
Rigid ducts are preferred over long flexible runs for exterior walls. They offer smoother airflow and fewer joints that can leak. Avoid extended flexible lines near exterior surfaces to limit condensation.
Install a proper wall sleeve and external flue cap to deflect rain. The sleeve creates a defined channel for the vent and a clean edge for flashing. Seal all joints with weatherproof sealant that remains flexible.
After hood replacement, recheck the exterior finish and ensure the hood cover blocks direct rain. Confirm that flashing around the vent remains integrated with the wall finish. Perform a quick water test to verify there are no entry points.
Exterior Seal Maintenance
Exterior seal maintenance focuses on penetrations and joints. Regular inspection of sealant around vents helps protect the envelope. Replace compromised sealants promptly to preserve waterproofing.
Choose sealants based on substrate and exposure. Silicone works well on glass and metal, while polyurethane suits brick and concrete. Ensure the product remains flexible to accommodate minor building movement.
Schedule seasonal checks after heavy rain or freeze thaw cycles. Look for cracks, staining, or loose flashing around hood penetrations. Reapply seals when you notice moisture marks.
Coordinate kitchen hood replacements with a building envelope professional. They verify compatibility with exterior finishes and flashing details. Thoughtful planning prevents moisture issues and extends wall longevity.