#714: Lead Paint, Exterior Insulation, and Deck Ledger Condensation Control

Be cautious with salvaged building materials, especially older ones, as they may contain lead paint or asbestos; always test for hazards and protect yourself.

When introducing new building systems like exterior insulation, assess the crew's familiarity and provide ample resources and training, as initial unfamiliarity can lead to higher costs or errors.

For wall assemblies using spray foam, ensure the correct ratio of closed-cell to open-cell foam for your climate zone to prevent condensation issues.

Properly insulating rim joists behind deck ledgers is crucial; consider the permeability of insulation materials and ensure good air sealing to prevent moisture issues, especially in humid basements.

New building codes, like those for deck ledger flashing and garage bollards, are developed to address common problems and provide clear guidance for contractors and code officials, improving safety and durability.

In colder climates, continuous exterior insulation helps keep structural sheathing warmer, improving thermal performance and durability by keeping the sheathing above the dew point.

If using spray foam for air-tightness, remember that it seals wall cavities but doesn't guarantee a fully air-tight house; other bypasses at floor plates or roof intersections still need attention.