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What materials are typically used in the construction of a traditional cavity wall?
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At what minimum height should a horizontal damp-proof course (DPC) be installed above ground level?
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| Question | Answer |
|---|---|
| What materials are typically used in the construction of a traditional cavity wall? | A traditional cavity wall is usually built using facing bricks for the outer leaf, lightweight blocks for the inner leaf, and insulation placed within the cavity. |
| At what minimum height should a horizontal damp-proof course (DPC) be installed above ground level? | The damp-proof course should be positioned at a minimum of two brick courses above the external ground level to effectively prevent moisture ingress. |
| What is meant by a partial-fill cavity wall? | A partial-fill cavity wall is a wall system where insulation batts are fixed to the inner face of the outer wall leaf, leaving a residual cavity for moisture drainage. |
| Which type of architectural drawing is used to indicate the position of doors and windows in a building? | Elevation drawings are used to show the location and dimensions of windows and doors on the external faces of a building. |
| What component is used to link and stabilise the inner and outer leaves of a cavity wall? | Wall ties are used to connect the two leaves of a cavity wall, ensuring structural stability and even load distribution. |
| How is ventilation provided beneath a suspended ground floor? | Airbricks are installed at regular intervals along the external walls to ventilate the space beneath a suspended floor, helping to prevent moisture buildup and timber decay. |
| Why is a weep hole positioned above openings such as windows or doors in an external wall? | Weep holes are placed above these openings to allow any moisture that has entered the cavity to drain out, thus preventing water accumulation and potential damage. |
| Which type of block is appropriate for use in areas below ground level? | Trench blocks are suitable for below-ground applications, particularly in foundations, due to their durability and load-bearing capacity. |
| What tool is best suited for shaping and trimming bricks during masonry work? | A scutch hammer is commonly used to neatly trim or shape bricks by chipping away material with precision. |
| What device is used to secure a bricklayer’s line to a wall for accurate alignment? | Corner blocks are used to attach a line securely to the wall, helping to maintain straight and level brick courses. |
| Which tool should be used for cutting bricks to size? | A brick hammer is designed specifically for roughly splitting or cutting bricks during the laying process. |
| What is the standard method for moving mortar around a construction site? | Mortar is typically transported using a wheelbarrow, which allows for efficient handling and mobility. |
| What is the purpose of using a straight edge in combination with a spirit level? | A straight edge and level are used together to accurately transfer height measurements across wall sections and ensure level alignment. |
| How can uniformed finish avoidance of banding of brickwork appearance be prevented? | To avoid visible banding, bricks should be taken randomly from at least three different packs during construction to mix colour and texture evenly. |
| What type of saw is recommended for cutting lightweight concrete blocks? | A masonry saw is the preferred tool for cutting lightweight blocks, offering the power and blade type necessary for clean and accurate cuts. |
| Where should cavity trays and weep holes be installed in wall construction? | Cavity trays and weep holes should be placed above door and window openings to effectively direct moisture out of the cavity wall. |
| What is the intended purpose of a weep hole in a cavity wall? | A weep hole is designed to facilitate the drainage of moisture from within the cavity, helping to prevent water buildup and potential damage to internal structures. |
| Which construction document should be consulted to determine the correct placement of wall ties? | The project specification should be referred to for detailed instructions on the positioning and installation of wall ties, ensuring structural stability and compliance with building standards. |
| What method is used to maintain an even level during the construction of cavity walls? | The use of gauging ensures that bricks and blocks are laid at consistent levels, helping to maintain uniformity and accuracy throughout the build. |
| How can the proportions of materials be accurately measured to achieve consistent mortar quality? | Gauging is used to precisely measure the quantities of each material in a mortar mix, which is essential for ensuring consistency and strength in the finished product. |
Created by:
wdewes