During the construction of a parapet wall, it is ensured that the corner junction where the parapet wall and roof slab meet, a triangular formation is provided which is called as Cant strip in wooden construction; concrete/mortar fillet or 'Wata' in local terms. What is the purpose of providing this?
- ATo provide stability against wind load arising during cyclones
- BTo provide a very smooth slope for the rain water to flow away from parapet
- CProtect from water seepage arising due to thermal and shrinkage cracksCorrect
- DNone of the above
Solution
Concept
Cant strip / fillet at parapet junction
Step-by-step solution
1. The parapet and the slab move differently with temperature and shrinkage, causing a crack at the junction. 2. A fillet (wata) with the waterproofing carried over it protects against seepage.
Explanation
The fillet covers the weak junction and carries the waterproofing smoothly.
Why the other options are wrong
It does not give wind stability; slope for drainage is the job of the roof slope.
Shortcut
Fillet at junction = seepage protection.
Correct answer: C) Protect from water seepage arising due to thermal and shrinkage cracks