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1. PSI and GPM Ratings Look for models with a PSI (pounds per square inch) rating between 1200-2000 for safe and effective car washing. A higher PSI might be too aggressive and could damage the paint. The GPM (gallons per minute) indicates how much water the unit can deliver; a higher GPM leads to better cleaning efficiency.
home car pressure washer

3. Roof Pitch and Complexity A steeper roof or one with multiple slopes, hips, and valleys will require more labor and safety precautions, leading to higher costs. Simple, symmetrical roofs are generally more straightforward to shingle and can help keep labor costs down.
average cost per square foot to shingle a roof

Roof shingles come in various materials, each with its own life expectancy
. The most common types of shingles include asphalt, wood, metal, and slate.