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透气孔，给墙里面的木头支架透气的
Google search "gaps in outside walls for air gap"
Gaps in outside walls for an air gap (ventilated cavity) are crucial for moisture control, allowing water to drain and air to circulate behind cladding (like weatherboards, brick veneer) to prevent rot and keep insulation effective, typically 25-50mm wide, often with weep holes at the bottom, but unwanted gaps between insulation and internal walls should be sealed, while intentional gaps need proper vents (soffits/ridge vents) to "breathe" and keep pests out, not solid blocks.
Why Air Gaps (Ventilated Cavities) Are Needed
Moisture Management: Rain driven against cladding can push water into the wall. An air gap allows this water to run down and exit through weep holes at the bottom, preventing rot in timber framing and mould.
Drying: Air circulation dries out any moisture that gets in, keeping insulation effective and preventing condensation issues.
Thermal Performance: Prevents "wind-washing" of insulation (air moving through it, reducing R-value) and helps manage summer heat.
Where You Find Them
Brick Veneer: A gap (around 25-50mm) between the brick and the internal wall structure, with weep holes at the base.
Rainscreen Cladding: A dedicated gap (25-50mm) behind the outer cladding panels.
Wall Batts: Sometimes an air gap is intentionally left between foil-backed batts and the sheathing for ventilation, though modern systems often integrate this.
What to Do With Gaps
Intentional Gaps (Ventilated Cavities):
Keep Them Open: Don't seal these with solid material unless adding dedicated ventilation.
Add Vents: Use soffit vents (under eaves) or ridge vents (at the roof peak) to ensure continuous airflow.
Install Pest Control: Use weep hole vent covers to stop rodents and insects.
Unwanted Gaps (Around Insulation/Structure):
Seal These: Gaps between insulation and the interior drywall or where the cladding meets the frame (unless it's a designed rainscreen system) should be sealed with air sealing tape, caulk, or spray foam to stop drafts and improve efficiency.
Key Takeaway: Differentiate between the intentional ventilated cavity (keep it open for breathing) and unwanted air leaks (seal them up for energy efficiency) |
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发表于 2025-12-6 10:56
