What Is a Rainscreen Cladding System Design?
Rainscreens (the ventilated — the cavity's; the pressure-equalized) manage the rain (the 90% — the shed; the 10% — the drained) via the cavity (the 3/4-inch — the vented; the compartmented) and the WRB (the air barrier's — the drainage plane). The design: the cavity's (the vented — the top/bottom), the compartments' (the pressure's — the equalized), and the WRB's (the continuous — the flashed). The wall's — the rain managed.
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How rainscreens work
The shedding (the 90% — the cladding's; the gravity's), the cavity (the 3/4-inch — the vented; the drainage's — the ventilation's), the equalization (the pressure's — the compartments'; the wind's — the neutralized), and the WRB (the 10%'s — the drained; the air barrier's).
Design
The cavity (the 3/4-inch min — the vented; the top's/bottom's — the screened), the compartments (the 400 sq ft — the pressure's; the sealed), the WRB (the continuous — the fluid's; the flashed — the penetrations'), the cladding (the supported — the subframing's; the thermal's — the broken), and the fire (the cavity's — the barriers'; the NFPA 285's).
Materials and QC
The panels (the metal's — the HPL's; the fiber cement's), the subframing (the aluminum's — the thermally broken; the galvanized's), the installation (the plumb's — the sequenced; the WRB's — the first), and the testing (the AAMA 509's — the validated). The rainscreen is the durable — the rain shed, the wall dried.
The bottom line
Design rainscreens with 3/4-in vented cavities, pressure-equalized compartments (~400 sq ft), continuous WRB/air barrier, and NFPA 285-compliant cavity fire barriers — validate per AAMA 509.
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