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frequently asked questions
HVAC zoning divides a home into independently controlled heating and cooling zones — each with its own thermostat — served by motorized dampers that adjust airflow to each zone based on demand. Zoning addresses Utah-specific comfort problems: upper floors that overheat in summer due to solar gain, finished basements that stay cold when the main floor is comfortable, and south- and west-facing rooms with high solar heat gain in summer afternoons. A two-zone system typically adds $1,500–$3,500 at new construction. The alternative — mini-split systems in specific zones — achieves similar flexibility with independent systems. RainFire Builders evaluates both approaches based on your floor plan and recommends the solution that delivers the best performance at the most reasonable cost.
MERV 13 is the recommended minimum during Utah wildfire smoke events — it captures PM2.5 particles in the size range that carry smoke compounds. Standard fiberglass filters (MERV 1–4) and basic pleated filters (MERV 8) do not capture PM2.5. Before upgrading to MERV 13 or higher, confirm your system’s blower can handle the increased airflow restriction — a high-MERV filter on an undersized blower reduces airflow across the heat exchanger, potentially overheating the furnace. MERV 16 provides better filtration but creates more restriction. HEPA whole-home bypass filtration provides the highest protection without overpressuring the main system. RainFire Builders specifies MERV 13 as the residential standard and sizes filter housings to accommodate it on every new construction project.
At Salt Lake City’s 4,200-foot elevation, air density is about 15% lower than at sea level. Gas appliances must be derated approximately 4% per 1,000 feet — a 100,000 BTU furnace delivers roughly 83,000 BTU in Salt Lake City. Air-moving equipment (fans and air handlers) also moves less air mass per CFM at altitude, slightly reducing effective cooling capacity. In Utah mountain communities at 6,000–8,000 feet, deration becomes even more significant. HVAC equipment must be sized based on altitude-adjusted performance, not nameplate ratings. RainFire Builders incorporates altitude correction into every Manual J calculation and equipment specification.
An ERV (Energy Recovery Ventilator) and an HRV (Heat Recovery Ventilator) both provide controlled mechanical ventilation for tight homes — introducing fresh outdoor air while recovering 70–80% of the energy from exhausted indoor air. An HRV recovers only heat. An ERV recovers both heat and moisture — making it the right choice for Utah’s dry climate, where it retains indoor humidity during dry winters instead of exhausting it. Modern homes built to current energy code are tight enough to require mechanical ventilation per ASHRAE 62.2. Without it, indoor CO2, VOC levels, and air quality degrade. RainFire Builders installs ERV systems as the standard ventilation solution for new construction in Utah.
Interior framing is the process of constructing the internal wall skeleton of a building using dimensional lumber (typically 2×4 or 2×6 studs) or metal studs. It establishes the layout of every room, defines hallways, and provides the structural support for load-bearing points. Interior framing also creates the cavities where plumbing, electrical, and HVAC systems are routed before walls are closed in with drywall.
A load-bearing wall supports weight from above — from floors, roofs, or other walls. Key indicators: the wall runs perpendicular to floor joists, it sits directly above a beam or foundation wall below, or it runs through the center of the house. Never assume — the most reliable approach is to have a licensed contractor or structural engineer assess your specific home. RainFire Builders includes load-bearing assessments as part of every remodel framing estimate at no additional charge.
2×4 framing (actual depth: 3.5″) is commonly used for interior partition walls where insulation is not required. 2×6 framing (actual depth: 5.5″) is required for Utah exterior walls to accommodate deeper insulation — achieving R-20 or better per Climate Zone 5 energy code. It is also used for plumbing walls where 3″ or 4″ drain lines need to be concealed. RainFire Builders uses 2×6 exterior framing as a default on all new residential construction.
Yes — removing or modifying a load-bearing wall in any Utah municipality requires a building permit and structural engineering review. A properly sized beam, appropriate post and column supports, and a city framing inspection are all required. This is one of the most frequently unpermitted home modifications in Utah, and it creates real liability and resale complications for homeowners. RainFire Builders handles the full permit and engineering process as part of every load-bearing wall removal project.
