Estimating, Layout & Planning Flashcards

When estimating carpet for stairs, approximately how much carpet (in linear inches of width) is needed per step when measuring tread and riser combined?

Answer: 18–21 inches

A typical tread depth of 11–12 inches plus a riser height of 7–8 inches totals roughly 18–21 inches of carpet per step.

For a diagonal tile installation at 45 degrees, what additional waste percentage should be added to the estimate compared to a straight lay?

Answer: 10–15%

Diagonal installation increases edge cuts at all four perimeter walls significantly, requiring approximately 10–15% additional material beyond a straight layout.

In a 3-4-5 triangle method used for squaring layout lines, if one leg measures 3 ft and the other 4 ft, what must the hypotenuse measure for a true 90° angle?

Answer: 5 ft

The 3-4-5 Pythagorean triple guarantees a right angle: 3² + 4² = 5², so the hypotenuse must equal exactly 5 ft.

When planning a ceramic tile layout starting from the center of a room, what is the first step before snapping any layout lines?

Answer: Dry-lay tiles from wall to wall to check border widths

Dry-laying a row of tiles from center to wall (without adhesive) lets the installer check border tile widths and adjust the starting point before any lines are committed.

A hardwood floor is being estimated for a 14 ft × 18 ft room with an 8% waste factor. What total square footage should be ordered?

Answer: 272 sq ft

14 × 18 = 252 sq ft; 252 × 1.08 = 272.16 sq ft, rounded up to 272 sq ft minimum (typically the next full box).

What does a 'working line' represent in flooring layout?

Answer: A chalk or laser line used as a guide for placing the first row or tile course

A working line is a snapped or laser-projected reference line from which all installation begins, ensuring rows remain straight and square throughout the room.

For an L-shaped room, what is the best approach when estimating flooring material?

Answer: Divide the room into two rectangles, calculate each area, then add them together with waste

Breaking an irregular room into rectangular sections, calculating each area, summing them, and applying a waste factor is the accurate and standard estimation method.