A window manufacturer specifies that their impact-resistant windows require a rough opening that is 1/2 inch larger than the window frame on all sides. For a window that measures 36 inches by 48 inches, what should be the rough opening dimensions?
Correct Answer
D) 37 inches by 49 inches
Adding 1/2 inch on all sides means adding 1 inch to each dimension (1/2 inch on each side). Therefore: 36 + 1 = 37 inches and 48 + 1 = 49 inches.
Why This Is the Correct Answer
When a manufacturer specifies 1/2 inch larger on all sides, this means 1/2 inch clearance on each of the four sides of the window frame. To calculate the rough opening, you must add 1/2 inch twice for each dimension - once for each opposing side. This results in adding a total of 1 inch to both the width and height measurements. Therefore, 36 + 1 = 37 inches and 48 + 1 = 49 inches.
Why the Other Options Are Wrong
Option B: 38 inches by 50 inches
This answer only adds 1/2 inch to each dimension instead of 1 inch. The error comes from misunderstanding that '1/2 inch on all sides' means 1/2 inch clearance on each of the four sides, requiring 1/2 inch to be added twice per dimension.
Option C: 37.5 inches by 49.5 inches
This answer adds 1.5 inches to each dimension, which would provide 3/4 inch clearance on each side instead of the specified 1/2 inch. This excessive clearance could cause installation problems and air leakage issues.
Memory Technique
Remember 'DOUBLE the sides' - if clearance is needed on all sides, you're adding that clearance twice per dimension (left + right for width, top + bottom for height)
Reference Hint
Florida Building Code, Chapter 14 - Exterior Walls, or manufacturer's installation specifications section
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