Windows

Question 1

Lintels with a clear span of 1200mm or less must have a minimum bearing of what?

Answer 1

100mm

Question 2

Lintels with a clear span above 1200mm must have a minimum bearing of what?

Answer 2

150mm

Question 3

How do we close the cavity at a wall opening?

Answer 3

Using a cavity closer

Question 4

What two things does a cavity closer do?

Answer 4

1. Insulates the cavity

2. Acts as a vertical DPC

Question 5

What is an alternative to solidly filling the cavity at jambs with cavity closer?

Answer 5

Using the Window or door frame to cover and seal the cavity

Question 6

When using a metal window frame to seal the cavity, how do we seal the junction between the metal frame and the external masonry?

Answer 6

Apply a mastic seal at the point where they meet

Question 7

Most loadbearing brick or block work walls over openings are supported by what?

Answer 7

Steel Lintels

Question 8

It has become common practice to build in some form of damp-proof course or tray of flexible, impermeable material to direct any water out to the external face of walls. Where is this DPC typically located?

Answer 8

Over the head of windows

Question 9

Every cavity should be divided by cavity barriers. What is the maximum distance between cavity barriers where the cavity has exposed surfaces?

Answer 9

Not more than 20m

Question 10

Cavity barriers are not necessary to divide a cavity formed by two leaves of masonry or concrete at least how thick?

Answer 10

75mm