The minimum number of holdfasts that shall normally be fixed on each side of the door frame is
- A2
- B3Correct
- C4
- D5
Solution
Concept
Holdfast requirements for door frame installation
Formula
NONE
Step-by-step solution
1. Holdfasts are steel flats used to anchor wooden door frames securely into the surrounding masonry wall. 2. Standard practice and building specifications dictate the minimum number required per side of a frame height. Answer: B
Explanation
Holdfasts are mild steel flats embedded into surrounding masonry to anchor the door frame firmly in place. Standard building specifications require fixing a minimum of three holdfasts on each vertical side of a door frame. Therefore, option B is correct.
Why the other options are wrong
A) Installing 2 holdfasts per side does not provide sufficient anchor stability for standard door frames. C) 4 holdfasts per side is fewer than the required minimum number specified for door frames.
Shortcut
Standard door frames require a minimum of 3 holdfasts on each side.
Common mistake
Selecting option A or C by misremembering the standard requirement of holdfasts per side of a door frame.
Correct answer: B) 3