The parapet is the most exposed wall on the house — sun and rain on both faces, sitting on a slab that heats and cools daily. Good detailing at its base and top decides whether it stays sound.
Typical Construction
| Item | Practice |
|---|---|
| Height | About 1.0 – 1.2 m above finished terrace |
| Thickness | 115 – 230 mm, per design |
| Material | Brick, solid block or AAC |
| Posts | Small RCC posts at intervals for longer runs |
| Ties | Starter bars or ties from the slab or beam |
| Coping | Sloped concrete or stone cap with drip |
| Plaster | Both faces, external grade |
Why Parapets Crack
The roof slab absorbs heat in Hyderabad's summer sun and expands, then contracts at night. The masonry above moves less, so a horizontal crack opens at the junction — letting water into the slab edge and ceiling below.
Reduce it by:
- Reflective or insulating treatment on the terrace, so the slab moves less.
- A rounded fillet and continuous waterproofing up the parapet.
- Ties or posts connecting the parapet to the slab.
- Mesh across the junction before plastering.
The Coping
A coping sheds water off the top of the wall instead of letting it soak in. Slope it inwards toward the terrace and give the outer edge a drip groove, so water does not stain the façade.
The Short Version
About 1 m high, tied to the slab, coped on top, plastered both faces, with waterproofing carried 300 mm up from a fillet. The junction with the slab is where parapets fail — detail it carefully.
