General Flashcards
The majority of walls are constructed using what 4 methods?
- Load bearing masonry
- Timber
- Steel
- Concrete
Name 5 typical thermal bridges you might see in a cavity wall / window detail
- No insulation at the masonry reveal
- Single glazing
- Metal window frames
- Where there is gaps in the insulation
- Where mortar has dropped onto the cavity tie
What are the two types of sound penetration?
A. Impact sound
B. Airborne sound
What dimensions are counter battens for timber slate walls?
50x25mm
Name two things that can cause render on external walls to crack
- Temperature changes
2. Moisture Movements
How do we minimise cracking in rendered external walls?
- By reinforcing the rendering with a mesh securely fixed to the wall
- By placing movements joints at no more than 6m centres
How are wall tiles spaced in a wall?
900mm horizontally and 450mm vertically
How are wall ties spaced around the sides of openings?
Around 300mm around the sides of openings
The cavity in loadbearing masonry construction is typically how thick?
50mm
Insulation retaining wall ties usually have what fixed over them?
Plastic wheel clips
Name the three types of surface finish for wood
- Paint
- Varnish
- Stains.
What is a cavity barrier?
A cavity barrier means any construction provided to seal a cavity against the penetration of fire and smoke or to restrict its movement within the cavity.
In order to inhibit fire spread in a cavity, every cavity within a building should have cavity barriers with at least a short fire resistance duration. Name 4 places where these should be installed.
- Around the edges of the cavity.
- Around the head, jambs and cill of an external door or window opening.
- Between a roof space and any other roof space
- Between a cavity and any other cavity (such as at the wall-head between a wall cavity and a roof space cavity).
