Part B

Question 1

Bifold rough opening sizes, half jamb

Answer 1

Width: door width + 32 mm
Height: door height +32 mm

Question 2

Bifold door opening size full jamb

Answer 2

Width: door width +50 mm
Height: door height +32 mm

Question 3

Which way do normal hinges swing?

Answer 3

Into the room

Question 4

Which side do reverse hinges swing

Answer 4

Into the public side of the room

Question 5

What height should lock sets be installed at?

Answer 5

915 mm (36”)

Question 6

What are the bifold door hardware?

Answer 6

Top pivot, track and top pivot block, bottom pivot, bottom pivot block, alignment clip, and slide guide.

Question 7

Purpose of alignment clip

Answer 7

Holds bottom of doors aligned

Question 8

Where do you install alignment clip?

Answer 8

150 to 300 mm from bottom of the door

Question 9

How to determine top casing length?

Answer 9

Reveal + top jamb length + reveal

Question 10

What moulding is used across the top of a door or window opening and can be made of a build up of many?

Answer 10

Architrave

Question 11

What moulding is used to trim corners of openings and casing butts on the side of them.

Answer 11

Rosettes

Question 12

What happens if the fasteners are too long in a pocket door frame

Answer 12

They will project though door frame and can cause damage to newly installed door

Question 13

Advantages over using open stock door and jamb materials

Answer 13

Reduced cost, ability to mix and match door styles and jamb materials

Question 14

Importance of screws being centred on hinges

Answer 14

Screws can push hinges out of place Ans cause door to be unaligned

Question 15

What should be done to allow hardwood floors to be installed on door jambs

Answer 15

Put a piece of flooring under jamb as a shim

Question 16

Why are doorstops cut short from the floor?

Answer 16

To allow easy cleaning along the floor line

Question 17

What check on a door before drilling the latch set

Answer 17

If the door has been stamped on the hinge side top or bottom

Question 18

What size hole should be drilled for a standard latch bolt? For a cylinder?

Answer 18

Drill latch bolt first is a 25 mm spade or forstner bit, then drill the cylinder with a 54 mm hole saw or multi spur bit

Question 19

Why are hinges installed on the jamb 3 mm lower than on the door?

Answer 19

To provide clearance ontop of the door

Question 20

Why should you use half jamb around bi fold door openings?

Answer 20

So the finish and appearance the door is similar to that of a swing door

Question 21

What is the hardware installed on the middle at the bottom of bi fold doors?

Answer 21

Alignment clips

Question 22

Why would you use screws to attach the top of a split jamb of a pocket door?

Answer 22

It makes them easier to remove later and make adjustments

Question 23

Why would you install the concave side of a bowed door to the stop of the jamb?

Answer 23

To pull the door straight when it closes to allow it to catch the latch and straightens over time.

Question 24

What to do to adjust a door latterly.

Answer 24

By shimming behind the hinges with thin material to move the door latterly.

Question 25

How to compensate for the bottom jambs being out of alignment.

Answer 25

Offset the jambs in opposite directions at the bottom to being closer in alignment.

Question 26

Why is casing installed with a reveal

Answer 26

So it will go past the strike plate and hinges without having to be notched around them

Question 27

What is the purpose of gluing mitres as they are assembled?

Answer 27

Helps keep it tight and locks in place so to resist opening due to shrinkage and building movement

Question 28

Different way of trimming the door opening where it meets the floor.

Answer 28

Using a plinth block on the door with the casing cut ontop of the square.