#731: Risks of CO, Proper Painting Sequence, and Detailing Felt WRBs

When selecting a hot water heater, especially for new installations or additions like large tubs, carefully calculate the 'first hour rating' and recovery rate to ensure it meets anticipated demand.

For hybrid or heat pump water heaters, consider potential solutions like adding an auxiliary holding tank or increasing the water temperature setting to improve hot water availability, but be aware of increased energy costs.

Always investigate all potential energy drains during an energy assessment; seemingly small appliances like heated mats can significantly impact utility bills if left running continuously without controls.

Install low-level carbon monoxide detectors, especially near combustion appliances, and be cautious of ventless heaters, as they exhaust combustion byproducts directly into the living space, posing health risks and moisture issues.

For complex HVAC systems, especially those combining forced air and radiant heat, ensure thorough coordination between trades and insist on detailed plans and clear labeling of all components to prevent control issues and simplify future troubleshooting.

When painting and installing trim, consider pre-painting trim in a shop, especially if colors differ from walls, and plan the sequence (e.g., initial wall coat, trim install, final trim and wall coats) to minimize touch-ups and splatters.

For WRB installations, particularly with felt paper, use the correct ASTM type (e.g., D226 Type 1 for siding, not roofing underlayment), ensure proper horizontal overlap (4 inches), and acclimate rolls to prevent buckling, especially when installing directly behind siding without a rainscreen.