Building Materials

A material cannot be evaluated apart from the assembly around it. Climate exposure, drainage, fastening, movement, transitions, maintenance, fire requirements, and installer capability often matter more than the sample board.

What this section covers

• Building-envelope fundamentals
• Exterior cladding and siding systems
• Rainscreens and drained wall assemblies
• Stone veneer and lightweight facade materials
• Fiber cement, stucco, metal, and composite panels
• Waterproofing membranes and insulation
• Material comparisons and specification questions

Start with building envelope basics before comparing finish materials. In wet regions, continue with building for rainy climates to connect material selection with drainage and drying.

For cement-based plaster over framed walls, use the stucco drainage and rainscreen mat guide to check the wall layers, product instructions, and base drainage outlet before concealment.

Building envelope and exterior wall guides

• Building envelope basics — organize water, air, vapor, and thermal control layers before selecting finishes.
• Window flashing and sill-pan drainage — check back dams, shingle-lapped jambs and heads, and the outlet before siding conceals the opening.
• Rainscreen wall systems — coordinate cavities, flashings, attachments, openings, fire, insects, and field verification.
• Rainscreen vent strips and intake-exhaust sizing — review top and bottom vent strip profiles, window breaks, and bug screen selection.
• Exterior cladding guide — compare material families by exposure, structure, fire context, maintenance, and repairability.
• Pacific Northwest siding guide — evaluate wood, engineered wood, fiber cement, vinyl, metal, stucco, and related assemblies.

Material selection should also reflect the site’s exposure. Use the moisture-control guide for drainage and drying principles and the coastal construction guide for salt, corrosion, wind, and flood context.

On commercial walls with exterior insulation, the clips, rails or screws that carry the cladding also cross the insulation. Use the cladding attachment and thermal bridging evidence review to compare continuous girts, clip-and-rail and long-screw support on matched structural and thermal evidence before accepting a nominal R-value.

At low-slope roof edges, metal and stone coping caps shed bulk rain but still leak at joints. Use the parapet coping joints and under-coping membrane review to verify the continuous membrane beneath the cap, anchor clip spacing, concealed splice plates, corner miters, and coping-to-wall terminations against the manufacturer’s installation drawing before closing the parapet.

Before enclosing a furred wall, the furring strips for vinyl siding guide helps distinguish a drainage path from leveling or a nail base and checks which layers contribute to fastener holding depth.

How materials are reviewed

The editorial method separates product composition, tested performance, code classification, installation requirements, climate suitability, maintenance, and unresolved questions. Manufacturer literature is treated as a source for declared specifications, not independent proof of field performance.

See How We Review Materials for the full evidence and corrections process.